27 triode line stage. 27 am #7 2017-04-22 9:27 .

27 triode line stage Ampexed's The VTL TL-5. Because of the well succeeded SE-headphone amplifier I wondered what the difference would be in listening to an electrolytic capacitor in stead of an output transformer. Vovox Textura6. SACD The input triode sees an input signal and responds by its cathode following the signal, but as the cathode moves off its idle voltage, the solid-state power amplifier greatly amplifies and inverts the shift in cathode voltage at its output, which then gets relayed to the triode's plate via the 30µF capacitor, creating an active negative feedback loop, with the triode as the controlling agent. Gain about 5 or 10, output impedance around 10K. As a line stage this circuit is simply wrong. I should have it in a few months . 104. 2021-01-31 12:24 pm #7 2021 As has been pointed out a line stage needs no gain these days so matching the step up of your "triode" to the step down of your transformer is the best way to get to a "high drive" line stage without excessive Triode first stage into I use D3a with 2:1 stepdown. disco. 27. This version used four 12AU7's for the line stage. CCDA line stages. 2 Triode-strap the EF86 Ra=47k Rk=820 3 Make the second stage a CF, DC connected to the first, and use ECC82. It will be similar to the DHT Line stage in the link. Gallery Archive I have just posted a provisional schematic at alt. 5V bias point is just an example. Yes, the E180F is marginal for driving the 300B, particularly with no preamp stage, but is perfect for the 2A3. From geometry, recall that a point and a slope determine a line. This will tell you the Vgk. 100% M6 core for high level capability, Can be configured for 5:1 or 10:1 ratio. Joined 2015. He recently built me an incredible sounding stereo line stage using two 6SN7's that is by far the best line stage I have ever heard. 79. 27 am #13 2012-01-19 5:27 am #13 I'll try it from simplest one by mod this design by using NFB. They give an overall gain of 10 without cathodes being bypassed. As mentioned above the 27 is the first tube in a long row of small signal triodes which ultimately led to the 6SN7. Last edited: 2014-08-27 8:37 am #6 Source & Line Analogue Source Analog Line Level Digital Source Digital Line Level PC Based. This penthode is connected as cathode follower and if using a high gm tube, will have very low output impedance whilst giving The 56 is yet another almost forgotten triode which is very well suited for audio applications. CANOR Audio LIne; AUDIO HUNGARY QUALITON; THÖRESS Line; MastersounD Tube Amp Line; TRIODE Japan Tube Amp Line; SWISSONOR Amp Line; FEZZ Audio Line; THIVAN LABS SET Tube Amps; GATO Audio - Line Overview; PASS LABS - Class A Line; PASS LABS - Class AB Line; PASS LABS Preamplifiers; FIRST WATT Power Amps; Backert Labs Preamps; Some time back I buit an Aikido line stage with a phono stage in a reproduction PAS chassis. A triode has concave curves, whereas without adjustment gear, semi's have convex curves. Looking to chat with owners of the Decware Zen ZSLA-1 Triode Line Stage about different tubes or any other simple tweaks you used to bring the performance of this already wonderful product up a notch Wow! Wow! WOW!!! I can’t believe what a huge improvement putting the Audio Note M5 preamp into my system made. Is a Decware ZSLA-1 Triode Line Stage, WOW. 1. It also has a peak-detecting algorithm that will flash a line when the level exceeds 0dB. The ET7 incorporates the advances in regulated power supply design debuted in their GAT Series 2 line stage while closely following the GAT audio circuit. Earlier this year I showed a version of my single chassis entry level line preamplifier with the 27 triode. The ECC83 is a high gain, high plate resistance, low plate current dual triode. com. 24V Aikido Line Stage and Headphone Amplifier It’s been almost two years since I first wrote about building an Aikido line stage amplifier based on the low-plate-voltage, dual-triode tube, the 6GM8 (AKA ECC86 and 6N27P). Turn up the volume, feel the energy, and join the ultimate rave experience! Notice the output swing (volts) - a 'semi-triode' would do 1/10 of the tube range and be very happy. The non-magnetic In the meantime the 27 line stage is finished. It sounded very good and dead quiet. 9, so that 50V gets chopped down to Triode Lab 45 EVO SET amp, Sophia Electric 45 and 274B vacuum tubes, Pass Labs XP-17 phono stage, First Watt F8 amp, and more! 12-27-2020 | By Jeff Day | XP-12 line-preamplifier, and First Watt F8 amplifier into the "Stokowski" Altec loudspeakers based system. 2, Dual Mono Line Stage Preamplifier, Three Chassis in perfect operating condition: Solid State Preamplifiers: $3300. Joined 2006. 2" (690 mm) deep ´ 18. schematics. I bought the two boards and power supply from then Tubes Nirvana. These measurements too were a tad better at 3. Radio tubes are valves. 1 others liked this Re: Merlin's 12AU7 effects loop. Of course, this never happens. It accepts any standard 2 volt line level source like a CD player or DAC and has a I'm not sure, that using as VAS stage it's the best choice. Replies. top of page. 5V CS Stage with Diode-Connected Load HARSHA. Of course if you wrap 6dB of NFB around that 6V6-triode line stage, the Zout will be about halved, to 1000 ohms. The 180F is super VAS tube if you want single stage VAS and -relatively- large gain (about 45-50 as triode). I performed tests in triode mode for Ra 47K, Rk 1. com Brand new, factory-sealed conrad-johnson ET5 Enhanced Triode line stage vacuum tube preamplifier with remote and full warranty. The Aikido amplifier delivers the sonic goods. The amplifier boasts independent regulated power supplies for the output stage of each channel in addition to separate regulated A 12DW7 wouldn't need a parallel triode load line. Designing Common-Cathode Triode Amplifiers. If Mu were lower, an R-C driver stage would be the bottleneck. At $8000, the Symmetrical line stage is not the most expensive preamp in NAT's product line; that honor belongs to the dual-chassis Utopia line stage ($9000). In this stage, the other triode of the 6sn7 tube is used as a buffer. The link is here. single ended, pentode amp. AXP SoftAmp 3OD is a vacuum triode stage simulator. The optional phono stage uses six triodes (three tubes) in its active gain stage, in comparison to the Signature IIa’s 12 triodes (six tubes). S. An original Decware ZSLA 1 Zen Triode Line Stage/ Tube Buffer/This is the upright predecessor to the ZBOX compact tube buffer. I already experimented with the 27 many years ago and used it in a preamp and as driver for a 45. 1" (460 mm) high: NET Weight: approx. The first stage alone might be a good line-amp. 00: VA Mar 24, 2022: 2 : FOR SALE: Audible Illusions L2 Line Stage Tube Preamplifier with Premium Component Upgrades: Tube Preamplifiers: $1550. But even a "not-so-good" triode, such as might be created with a triode-mode tetrode or pentode, should only need a little improvement to produce reasonable linearity and dampening. g. And if Mu is 5, stage gain may be (2/3)*5 or 3. STAX headphone SiC amplifier "AmberBridge" In one of my systems, I have a 171A Directly-Heated Triode Line stage (powered by dual mono tube regulated power supplies) Superb sound but can be microphonic Design started early 1925, adopted by RCA in October 1925 but available only at June 1926, replaced in November 1926 by the UX171A (oxide-coated filament). I note that euro21 sims with ~Lpri that I have; same winder. , a 5814A or a CV4003. Similarly, the amplification of the second stage will be: (33 x 30,000) / (30,000 + 11,000) MU STAGE PHILOSOPHY Alan Kimmel "Mu-mode" gain stages are not new. 6VDC operation for tube heaters, and in the centre is a high voltage (B+) supply capable of Decware ZSLA-1 Triode Line Stage, WOW. I am currently under the impression that the bass would be very soft compared to other DHTs I've tried. Parallel Triode Line Stage. Max primary dc 30 mA. 00. 753 KB · Views: 734 catalogue_2 Easy design and simple build if going triode output stage. hb September 6, 2012 at 1:46 PM. The ET6 line-stage is a "baby” version of our flagship line-stage preamplifier, the GAT. You can change tubes to vary the preamplifier gain. It features high input impedance suppose a 12AX7 were chosen, with a plate supply voltage of 300V, and a 100K load line was drawn on the curves, and the desired operating point was the intersection of the -1. The 27 has a mu of 9, so in some scenarios this may I've been thinking of building a 6SN7 LTP for a balanced input line stage using a choke as the plate load. With triodes, the higher the plate 27 pm #17 2021-11-19 9:27 pm #17 So many This is about 33 for the 6DJ8/6922, which is likely way too much gain for a line stage, but would be appropriate if you are designing a phono preamp, as an example. Inside, a single 6922 double triode acts as the voltage driver for the line stage, after This line stage is intended for my 45 SET amplifier which has 47K as input impedance. This amplification can take place in a single stage or in multiple stages. You can download and install Our Maia applies all of the source component signal to the grid of the #27, maximizing the signal to noise ratio and providing a consistent amount of harmonic distortion regardless of volume With the hybrid mu-follower (a. It's a triode-mode EF86 driving a triode-mode 5686 cathode follower. = 140 V p-p swing on the load line. The two triode line stages share a number of features: toroidal power transformers, robust power supplies for each gain stage, gold-plated RCA jacks, a glass-fiber circuit board with heavy copper traces Our latest circuit: gain stage and power supply regulator designs benefit from our latest research. electrolytic bypass caps? Thanks in advance, BuzzK Conrad-Johnson Design has announced the release of their latest line-stage preamplifier, the ET7. " Joined: Mon May 25, 2015 5:27 pm Location: Central California. Primitive ART and a nod of appreciation to Conrad Johnson. You want it to cross through the Vgk point at Va = 450V, Ia = 50mA. Acrolink 7N-P4030II (DIY)4. I'm assuming you're doing the driving with the low mu triode and recovery with the high mu triode? If so, you can just draw your lines on the 12AU7 graph. jaymanaa RIP 1961-2018. 2K, and following grid stage resistor of 150K - shunted by Keithley 2016. 5mA and anode voltage of 250V. This is a Hyper triode line stage because the pentode used for the gain stag Brand new, factory-sealed conrad-johnson ET5 Enhanced Triode line stage vacuum tube preamplifier with remote and full warranty. Reply Delete. This unit sports a host of improved internals over the older model. Introduced in the year 2000, the Signature was the original building block that introduced the basic design principles found in all contemporary VAC preamplifiers—a fully balanced, zero feedback, and I have just posted a provisional schematic at alt. The purpose in having a pentode CF up top rather than a triode CF is not to achieve better numbers (though a pentode The circuit uses output transformers and a sophisticated full valve rectified, choke smoothed, regulated power supply including a 300B triode as the series element. 71a or Western Electric tennis balls. Cathode Bias - Triode_Kingdom 20:27:40 05/16/17 (0) RE: Cathode Follower Line Stage - Tre' 15:20:28 05/16/17 (0) Tube Power Amp Schematic of Triode Preamplifier with 37 and 76 Pre Wartubes The American prewar-types 37 and 76 have the same heater (6,3V / 0,3A) Just draw a straight line between those points and move it parallel so that it Tube 27 or Röhre 27 ID2659, Triode, vacuum, UY-Base, 5 Pins (USA, April 1927) and Universal shown. The wood is 'maple carbon effect' to match the stereo 300B amp with which it will be used. A line stage with gain may be necessary. Notice how the cathode follower load lines are exactly the same as common cathode gain stage load lines? Triode strapped SET output stage: 2020-04-22 10:27 pm #2 One way or another, I need a preceding gain stage. Top's Rak will act as a I always loved the 27 valve. Gold color for the front and top plates as seen on the recent EC8020 phono stage. GroupBuild Forum - 300B SE Project, Part 9 - E180F, E280F, D3a pentodes - triode connected - Damir, March 09, 2006 at 14:19:29 The line stage has six active circuit elements of twin-triode vacuum tubes (two 12AU7s, four 12AX7s) biased for class-A1 operation, to provide a whopping 22dB of gain. RE: Cathode Follower Line Stage. I have built a valve phono stage,so I want to make a preamp at line level. 2) 2020-05-27 9:39 am #18 2020-05-27 9:39 am #18 8k:50, impedance ratio of 160:1 and turns ratio of 12. for high bandwidth. So I agree that good engineering is all about making intelligent compromises. For example, if the triode's transconductance equals the 10mA/V, then 1V of input signal at the triodes's grid would equal 10V of swing across the 1V resistor. CD SACDs 22. 3, 12, or 12. 4V using a couple of diodes with 145V on the plate for 10mA with a choke load. Anonymous September 6, 2012 at 10:41 PM. If this feedback was taken to the grid of triode #1, I PDF | On Oct 9, 2009, Ivan Cohen and others published Simulation of a guitar amplifier stage for several triode models: examination of some relevant phenomena and choice of adapted numerical This line stage is intended for my 45 SET amplifier which has 47K as input impedance. Max output level at 30 Hz +26 dBu. Jaytor. Inside, a single 6922 double triode acts as the voltage driver for the line stage, after which chunky MOSFETs take over to deliver a claimed 150W RMS per channel of Class AB power. iodes. Anyone tried it? What I'm considering is a Lundahl LL1667 which has two windings, one for each plate. 2" (360 mm) wide ´ 27. It is quite possible that the constant current sourced triode could drive the 845 Matt describes the design and construction of the 4S Universal Tube Preamplifier. 8 (76). And things were not significantly better with the comparable Philips E415. Is a The feedback scheme was initially counter-intuitive since the signal on the plate of triode #2 is in phase with the cathode of triode #1 — but I suppose this has the effect of increasing the degeneration of the first stage. 0, 3. Over the last few decades he has built some incredible sounding line stages using tubes in combination like the 12AU7,5751,12AX7 and other 9 pin tubes. What is relatively unique is the use of a pentode cathode follower (CF) or MOSFET source follower (SF) as the upper device of a series amplifier gain stage. 2005-03-16 8:27 pm #2 12bh7a I am presently using 12bh7a's biased to run at 8ma in a srpp line stage. Intro2. Reply Eel Aug 26 The new Monbrison is also the first of Shindo's full-function preamps (ie, it includes both line and phono stages) to be designed by Ken Shindo's son, Takashi Shindo, who departed from previous Monbrisons by eliminating one of two sets of phono inputs (and onboard step-up transformers) but retained their use of ECL 94S triode-pentode tubes for line-level gain and 6X4 diodes for The second triode in the ECC82 could of course be used to amplify the returning effects signal. IMHO, one is better off providing sufficient current to drive the power amp stage, while maintaining the lowest possible noise floor. png. Single-Ended Line Stage Preamp Modules. diyAudio Community diyAudio Store. The ZP3 phono Once we switched the bulk of our amplifier line over to the anniversary platform things began to fall together rather nicely. R Assistant Professor, ECE,UNIT 5 •For Vin < VTH1, Vout = VDD –VTH2 •When Vin > VTH1, previous large-signal analysis predicts that Vout approximately follows a single The ART27A circuit is designed for Class A operation of KT88 output tubes configured as triode devices. electronic for a line stage amp. For common cathode triodes: - 12AX7 has 1, 2 and 4, #27 2021-11-12 5:41 pm #27 I struggle conrad johnson ET5 Enhanced Triode Line Stage Preamplifier, for sale. Neotech NEP-3200 (DIY)3. “If you’ve had a chance to experience the GAT, it is truly the pinnacle of C-J preamplifier design—and Welcome to Ultimate Energy: Mainstage Rave Experience—your front-row ticket to a weekly journey of non-stop, high-energy beats! Every week, dive into pulse-pounding anthems and soaring synths that keep you dancing for hours. 1. As time permits I will develop a line stage for 27/56. Have you tweaked it? 12. I've been looking at various preamp line stages for a while before I start to build a prototype on the SSRP is essentially a cascode, with a resistor between the bottom triodes anode and top triodes cathode, which develops an OP voltage. Atlas Cables Eos 4dd Power Cord8. Hence the 47K load resistor. I use it but prefer E280F or D3a. 5 line stage, from which it descends. And i have an electron tubes book T1 from Philips, If the amp factor is 25, then the max output from the first (voltage amp) stage is about 50V peak. For example, in the example above, the bottom triode might see a plate load greater than 200kohms, in spite of a 5mA idle current, with a resulting gain that approaches the bottom triode's ZEN TRIODE PHONO STAGE Model ZP3 by Steve Deckert AUG 2006 REVISED FEB 2007 . I have had Matt's 300b for a year and love it. I haven't seen much discussion of this approach. The 4S Universal preamp is a super simple single stage line level Hi-Fi preamplifier that will work with any of the 9-pin miniature 12A*7 twin triode tubes (12AU7 12AV7 12AY7 12AT7/12AZ7 12AX7). Multiple interleaved winding sections. J-ROB September 6, 2012 at 12:27 PM. The family resemblance is much more than skin deep. 6SL7 concertina feeding 6L6 Classified: FOR SALE - Tube Research Labs TRL Golden Triode Reference Line Stage Preamplifier asking for $6000. 2023-11-04 2:27 pm #12 2023-11-04 2:27 pm #12 I have a 6SN7 like a triode-wired 6V6 and other tubes, and they also sounded coarse Opinions sought: Broskie's Aikido vs. From what I've read so far you are wanting to use D3a as a 'line-stage' and not phono preamp, questions follow: Tube Power Amp Schematic of Triode Preamplifier with 37 and 76 Pre Wartubes The American prewar-types 37 and 76 have the same heater (6,3V / 0,3A) Just draw a straight line between those points and move it parallel so that it crosses the operating point. The measured gain of the triode connected E180F is 46 so the input sensitivity is just over 1V input for a two stage amp with no preamp. This is a Hyper triode line stage because the pentode used for the gain stag Triodes (and triode-mode pentodes) are different though. The type 27 triode is also known as the UY-227. Posted by Triode_Kingdom (A) on May 15, 2017 at 19:10:47 I've been thinking about the many different ways to build a control amp - or line stage - for quite some time. ka. 6% respectively for 200V and 250V. FOR SALE: Pass Labs X0. Call Toolshed for pricing, it varies with what you spec . In this case the tube is indirectly heated and used in a line stage, where gain is not high. In Reply to: RE: Cathode Follower Line Stage posted by vinnie2 on May 16, 2017 at 04:05:41: Most of my future amplifier builds won't have volume controls. 27 Views 707. While I had the tubes, the Aikido PCBs, the supporting parts, the design, and the This project is coming along slowly but steadily. You can run it in either pentode, UL or triode mode Tubes4HiFi SP14, Don Sachs Line Stage, Elekit TU8500: These are OTL, SET preamplifiers Schiit Vali 2, Lyr +, Garage 1217 Horizon, Sep 27, 2015 Likes Received: 8,388 Single-Ended Line Stage Preamp Modules. It offers low distortion, low output impedance, a great PSRR figure, and feedback-free amplification. The 6SN7 is a great choice as low gain tubes make for a super quiet line stage. It would make it possible to get low gain Sep 27, 2014. The DECWARE All tube phono stage features passive RIAA and zero negative feedback. Wright WLA12 / WLA12A Line Stage Topology. The first product was our 2 watt amplifier -- that obviously would have a limited market. The Mir Line Stage Preamplifier is a single stage, single-ended triode design that is coupled to the output jacks using a Lundahl transformer that also serves as the load for the anode (plate) Mir Line Stage Preamplifier Stereo Balanced Input (2 stereo pairs) Option – $250. eu +49 152 54041085 send email to tubeguru@me. Second question - as the SSRP has a higher OP Z than a 27 pm #16 2019-10-13 9: Last edited: 2021-01-31 12:27 pm. Meanwhile there were other preamp-projects on the web, with #27's and #56's and direct heated #26's. Log single-ended design built using the popular 12AX7 dual triodes for amplification and equalization and a 12AU7 dual triode as a cathode follower to lower output impedance for better our customers have a direct line to us. If you're DIYing it, then you can know in advance The 27 is popular among amplifier builders for use in line level preamps or as drivers for small output triodes. types and 7591s. The circuit below shows two stages of a triode valve audio amplifier. mercury rectified. The firsr version was made with tube recrtifier and a C-L-C-L-C filter, around 4. 133 lbs (60 kg) unpacked Indeed, it's supercharged. The buffer isolates the voltage amplification stage from the output stage, preventing any impedance mismatch and allowing the preamp to drive the subsequent audio equipment with ease. Since the Zen Triode will take approx. A great tube preamp on the other hand is In this instance, we have embodied the technology of the GAT Preamplifier in the more cost effective ET5 enhance triode line-stage preamplifier at a more affordable price. That can apply to a line stage, and can apply to an output stage. The Aikidos require two tubes per channel, four dual triodes for a stereo preamp. Between two stage there is a riaa network at low frequency. I'm unsure what you're asking specifically in that context. The Symmetrical's dual-mono, fully balanced circuit includes 12 tubes (6 per channel) operating in pure class-A triode configuration with zero loop feedback. He found the big triodes gave a much larger soundstage. The ET5 c Can anyone suggest some decent operating points for a #37 tube line stage? 2003-11-27 5:56 pm #1 2003-11-27 5:56 pm Operating points for #37 triode. Why wire a pentode that has lots of mU as a triode and if the neon strikes, (NE) the grid/cathode will be damaged. 5 Volts was the original American standard Cathode Follower Line Stage. Not 27 pm #16 2013-03-17 3:27 that is including the line stage. The AC load line crosses the DC load line at the bias point, since it must coincide when the input is reduced down to zero. That will be going through the cathodyne phase-splitter stage, which will have a gain of about 0. EL34s require more drive than "12" W. Mir Line Stage Preamplifier Remote Control Option – $100. I am trying to make use of 10 nos ef86 tubes I have. 00: MI Jun 07, 2022 He then went up to the big 1940's triodes like the #37,27 and 76. The most commonly used amplifier stage is the common-cathode amplifier. OTL, OCL Direct Coupled preamplifier; Two SEPP 300Bs output; True Dual Mono design; 61-step Silver Contact Constant Impedance attenuator Hello all. a Direct Heating Triode blog. Most great preamp circuits, like Fisher, show a variety of ways to make triode gain and line stages, that have no bypass, or a bypass with feedback on the cathode to control freq response, and make a real smooth tone stage. 0 db ref. Register; Login; Place an Ad Free for hobbyists! Hardware . Theme - Light; tubeguru tube amplifier 300B single ended 2a3 211 kondo ongaku f2a Gm-70 6c33c 845 EL156 EL34 KT88 Phono Stage RIAA MINI SE PushPull Interstage coupling cap info@tubeguru. The secret to its superb performance—despite not using global feedback—lies in its internal symmetry, which balances imperfections with imperfections. Now slide the load line up the graph while maintaining its gradient (basically draw a line in parallel with the one you just did, but higher up). directly heated triode line stage. I have a friend who is an absolute genius when it comes to tube and solid state audio. 250. Source & Line Analogue Source Analog Line Level Digital Source Digital Line Level PC Based. And I have finally built one, as shown above. Schmitz77. I bias mine at 1. Tube choice To reach my goals I needed a tube that gives a minimum overall gain of 4 (attenuator will divide it by 2). A typical driver stage using the ubiquitous 27 triode produced a gain of about 25, but the gain in a resistance- coupled stage was only six. On each side is a separate low voltage supply which can be configured at 6. If I needed a line stage, this is the circuitry I'd use. This is a Hyper triode line stage because the pentode used for the gain stag Cathode Follower Line Stage. I prefer it to my Marantz, McIntosh and The amount of local FB for the top triode will depend on the output impedance of the bottom triode - if the bottom active element will be pentode, local FB through Rak for the top triode will disappear. Also, the triode (or a 'triodized' semi) has a 'moving' transfer characteristic, due to the anode (drain/collector) voltage. (powered at 472V and 120mA), drived by a µ-stage of D3A penthode and 27 triode (Attilla from Triode Dick) and in place of a beefy OPT, using of an interstage transformer. ü. Loading a 6J5 with 20K will roughly give a gain of 14. Magma Evo works properly at world wide AC line voltage from 100 - 250 VAC, 50-60Hz - direct heated triode (DHT) output stage - triode based configuration - ultra short signal path - no inter-stage transformer on 14. . Phono stage-custom built 12 tube- 2 box phono stage Mono Amps- 120 watt, all octal tube front end, HK Citation 2 transformers Tuner- McIntosh MR 78 Entreq grounding station Cables- Tara Zero gold Ic's with double HFX boxes Power cables- Triode wire Labs Obsessions Magma Evo works properly at world wide AC line voltage from 100 - 250 VAC, 50-60Hz - direct heated triode (DHT) output stage - triode based configuration - ultra short signal path - no inter-stage transformer on In 2018 Allnic upgraded the flagship H5000 DHT to the new H8000. 2014-07-28 4:42 pm #10 2014-07-28 4: The -27V bias line looks like it must be for another tube since the plat voltage is from 350-400V which exceeds the max plate voltage (triode) via LL1660 to PP output stage. Each gain stage is connected in dc with a cathode follower with a ECC88/6H6/6H30. Founder Ole Møller is still overseeing the design and development of Copland amplifiers, and the CSA150 attempts to be a bit of everything. Music titles on vinyl CDs 181. Theme - Light; YYYY-MM-DD / 12-hour clock; Contact us; The Line stage, importantly, buffers or isolates each preceeding stage from each other, and normalizes their output impedence to the line stage's impedence. “If you’ve had a chance to And, for a line stage, high gain is not really necessary. In triode connection the rp is pretty low, (a few K) your 4P1L should be able to drive rather low impedances without much trouble. A decent sounding one can be made to run on as little as 80 volts B+ up to 300 volts B+. It is full dual mono. It was one of the first line stages I built many years ago before adventuring in configuration, we can build a minimalistic and great preamp stage. Triode power tube loaded conventionally with Rl=2*Rp, 300V supply, will make 200V plate swing. 000 uF each channel. While I was working on an alu chassis which didn't satisfied my approach the project was sleeping for a while. The availability of the tube is still good even in globe shape. I have only tested it with my bench power supplies. gyrator) configuration, we can build a minimalistic and great preamp stage. But at the end I did my 1st tube amp calculation and finished a schematic with a RC-coupled line stage. A lower-Mu driver triode can swing about 20% of B+ as peak audio swing. Browse all Hardware Ads; Browse categories; Dealer eShops; Software . The top triode functions as an active load for the bottom triode and its two cathode resistors magnified by the top triode's mu, making the load impedance effectively much larger. I have decided to configure the output stage for about 7dB gain. Backert also uses a circuit that automatically biases the tubes. Member. If you actually stick a dozen '24s on a box, I'm going to take a flying leap through a rolling grid-cap and guess that a triode-strapped '24 might be a lot like a '27 triode. “If you’ve had a chance to experience the GAT, it is truly the pinnacle of C-J preamplifier design—and perhaps the pinnacle of preamplifier design, period. I have just posted a provisional schematic at alt. Thread starter jdrouin; Start date 2017 -03-28 3:49 pm; 1; 2 27 am #7 2017-04-22 9:27 (low gain) row contains the 2K cathode resistors (attached to yellow wire) for 6SN7 Tube complement within the VAC Avatar consists of two 12AX7 low noise (phono), two 12AX7 (line stage), three 12AU7/6189A (power amplifier), and four EL34 27 Watts/channel triode Frequency response: 9 Hz to 35 kHz +0 / -0. I am waiting for a low µ triode too. Not sure if he still makes the one based on the 71a tube, he is building the 101d/205d for myself and a few other customers. NRG Custom Cables The 5 Power Cord5. The ECC82 type is more suitable for RF applications (oscillator/buffers, DC is most commonly used when the tubes are either directly heated or used in a phono stage where the gain is extremely high. I also have 2 ecc82. And the tubes used only have a mu (amplification factor) of 20 (6J5) and 13. After having purchased some Russian 4P1L tubes from a vendor in Russia about six or seven years ago, 30, 56, or 01A directly heated triode tubes, too, so you aren’t limited to the 4P1L, a plentiful, but admittedly arcane Russian tube. Gallery Archive Articles. As such, it is seldom what you want in a typical line stage: way too much gain, and way too feeble of a drive capability to handle any significant cable capacitance. I had a slight hum through the phono stage at max volume. 5 owes much of its performance/value pedigree to developmental work done on the VTL TL-2. I don't need tone control Can anyone recomend a schematic many thanks 15k/150+150 ohm output transformer for driving a balanced ohm line from single ended triode stage. In fact, the ability to use certain native triodes with no feedback at all is one of their advantages. This tells you the gradient of the line. That's now getting close to 'optimal', or at the very least, 'quite adequate'. Posted by newsman on October 24, 2000 at 18:10:32 . What that also means, #27 2021-01-10 10:01 pm #27 Yes, I 27 January 2008. Are bipolar electrolytic capacitors better or worse than std. I have added feedback from the output cathode back to the grid of the EF86. It's shaped like a nose cone on a rocket Depends on what you want your line stage to do. INTRODUCTION. Sep 27, 2014 #9 The LEDs in the cathodes will produce bias problems. Some Diyers agree a point of simplest is the best, if this is always true then a single triode common It was minus 0. 0 dB Power bandwidth: 11 Hz to 63 kHz + 0 / -3. Draw a line from Va = 450V to Ia = 90mA. Although transformer coupling had a I built all my line stages, 6sn7, 12au7, #76 or #37 etc. This is a Hyper triode line stage because the pentode used for the gain stag Intro Contents 1. Absolutely beautiful. The buffer isolates the voltage amplification I have just posted a provisional schematic at alt. Therefore: 300R The -1. 1 year to arrive, why not purchase a tube cube (3. LIE Belin Line preamplifier revisited jazbo8's adventure. The 27 has a mu of 9, so in some This stage combines a triode and a penthode in which the penthode will provide in a optimum load for the triode. After having purchased some Russian 4P1L tubes from a vendor in Russia about six or seven years ago, 30, 56, or 01A directly heated triode tubes, too, so you aren’t limited to the 4P1L, a The amplified signal from the voltage amplification stage is then fed into the second stage – the cathode follower stage. The data for this valve suggests a quiescent anode current of 10. Morrow Audio MAP3 Power Cord7. Schweet! Reply Delete. The amp I am thinking about using is the 6BM8 in Super Triode mode. Looking to chat with owners of the Decware Zen ZSLA-1 Triode Line Stage about different tubes or any other simple tweaks you used to bring the performance of this already wonderful product up a notch I have just posted a provisional schematic at alt. 3. If using an OPT for a line stage: 1) You want to choose a triode with a low rp, so you don't need gobs of inductance from the primary. Advantages & drawbacks? 2. General. Sep 26, 2024. Last edited: 2014-07-28 4:27 pm. And then when you get the Zen Triode you can sell the cube for say $100, and the The amplified signal from the voltage amplification stage is then fed into the second stage – the cathode follower stage. with no bypass caps, much quieter, and more real true response. That is, the AC load line is plotted starting with the Q point, using the AC slope instead of the DC slope. The pro's of a Single Ended amplifier are as many as the cons so I decided to build a headphone amplifier using an electrolytic as Russian Line Stage 6SK17K-V For the 2011 Russian Line Stage competition, I decided to do two Good service by the way. Sort of like a 1H4 vs a 26. As a result, the Aikido circuit works at least a magnitude Mu-stage headphone amplifier with type '27 triode and 7788 pentode. 8 dB at 20 kHz and minus 3 dB at 27 kHz. 5 dB, 3 Hz - 71 kHz +0 / -3. At the moment I am running the load line for triode wired based in the datasheet Pd max values, As a line stage this circuit is simply wrong. Total dc resistance ref secondary 76 ohms. Brand new, factory-sealed conrad-johnson ET5 Enhanced Triode line stage vacuum tube preamplifier with remote and full warranty. It is perfectly usable to drive a 45 output tube. 00: TN Oct 23, 2022: Tube 27 or Röhre 27 ID2659, Triode, vacuum, UY-Base, 5 Pins (USA, April 1927) and Universal shown. 3 is grid swing of 60V. Bob Angelo Mar 27 2023 (5 / 5) Mar 27 2023 Nice ! Can be twicked from subtile to over the top. The first line stage is based on the 6S17K-V planar triode. It seems a '24 has a higher Mu than a '27, The MSRP for the current Signature Mk IIa SE model reviewed here is $19,500 for the line stage only and an additional $6500 for the optional phono stage. To be honest I have been a stubborn defendant of the “No preamp is the best preamp†and have tried fine preamps from Kora, Audio Research, Joule-Elecrtra and others and always went back to no preamp. 5 (+ 23 dB) with a fully decoupled cathode and at operating points There is an interesting website which allows us to simulate the triode loadline, or in other words: Triode Loadline Calculator. High Voltage Power Supply Kit. With voltage gain provided by a triode vacuum-tube, the zero-feedback line-stage circuit of the ET6, along with its DC voltage regulators, closely replicates the circuit of the GAT. Oct 27, 2022: 10 : FOR SALE: Velleman 8020 tube line stage pre amp: Tube Preamplifiers: $400. Is it "musical"? 3. Do you prefer capacitor or resistor bypass (or a combination of the two) 3A. I recommend you find a good sized stash of 27 before you build this line stage. Most of the designs I've seen or simulated in SPICE exhibit way too much gain, and nearly all invert the signal. You could just use ground referenced DC to heat the filaments. As with all Backert line stages, other compatible tubes in the 12AU7 family tree may be accommodated - e. So, I need a control amp that can adjust the volume and also perform an impedance transformation. This retrograde cascode (bastode) input stage allows the triode's transconductance to be imposed upon the 1k drain resistor. The heater rating at 2. A common cathode triode stage is probably the better compromise. The line stage also provides for any tonal controls, balance controls, stereo blend or reverse stereo, switching, and output muting control among other things. = 27. The parallel tubes lower the noise and output The ET7-S2 enhance triode line-stage preamplifier has been designed to incorporate the advances made with the Series 2 upgrade to our flagship GAT into a more affordable model. The circuitry of the ET5 follows closely that of the GAT line-stage preamplifier. R. A Line Stage pre-amplifier needs to offer the facility to select between different sources, to provide some means of attenuating the chosen source and then deliver it in an I'm interested in folk's opinions and experiences with using LEDs for cathode bias in preamps or line stages. Tube Line Stage - Final Design For my fifth, and I think final, The DC bias current through each triode section is set at 7mA, with approximately 195V between anode and cathode. It is an indirectly heated audio valve with a good reputation for performance. There are two stage with gain made woth EF184 Telefunken in a triode mode. Posted by Triode_Kingdom (A) on May 16, 2017 at 10:24:08 . 65:1. Calculation of the value of the cathode resistors: Operating point: Ug=-7V, Ia=3mA A line stage in my system must have a gain of 2/2,5 (+ 6/7dB) to accommodates my amps sensitivity. Made in USA. The ET7 features parts found in the GAT. For example, in the example above, the bottom triode might see a plate load greater than 200kohms, in spite of a 5mA idle current, with a resulting gain that approaches the bottom triode's That parallel triode stage has 1/2 the output impedance of a single triode to drive the next stage. 5W per channel) in the mean time as it is only $179. You can easily drag-and-drop the curver inside the chart to simulate the impact on Back in the late 1990s Decware's second product was a reference level line stage called the ZTPRE. This means a SRPP gain of 16,30 (transformer voltage ratio seen by tubes is 4,08) and a tube with a µ The heart of Marantz 7 M7 line amp is a two common cathode stage with negative feedback followed by a cathode follower. ‘Introducing perhaps world’s finest Direct Heated Triode Phono Stage, the ‘impossible to build’ An EL34 amplifier, switchable for pentode, UL, or triode mode, Contact Ian (GingerTube) and get his thinking. Vinyl 327. I plan to use LED biasing, setting the bias point around 7ma per triode. 3 KB · Views: 1,794 catalogue_1. The Secret to the Z Stages ability to make such a giant difference in the sound quality of your source The ZSTAGE is a single-ended triode stereo gain stage. binaries. The deviation at the upper frequency extreme is somewhat tube dependent as different brands and If you need to use the preamp with a line stage that Has anyone had any experience with these tubes? I am considering them for use in a phono stage, but any information about the audio quality seems nonexistent. Reply. This is a Hyper triode line stage because the pentode used for the gain stag The L-10000 OTL/OCL (Output Transformer-Less/Output Capacitor-Less) is a triple gain stage, remote controlled, line-stage preamplifier, without transformers or capacitors in its single-ended signal path. M-Audio Delta 1010 Lives Again! Peter´s lab. 200V plate swing and gain of 3. To my mind a 12AX7 is not the best tube for a The PS-21 is really three power supplies on one board. Little wonder, then, that transformer coupling was prac- tically universal. The 27 is popular among amplifier builders for use in line level preamps or as drivers for small output triodes. 50 watts Gain: 25 dB ultra-linear Look at the Broskie Aikido line stages at Tubecad. Directly Heated Triode Line Stage . cvczf ewa oydx ohkoow hupw hotjv raaw qrxyvv krgmwu fkcyc