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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="KOTriode"]The preamp has the classic tube regulated power supply using 5R4, 6AS7, 6SJ7. It is transformer coupled output and has no capacitor in the signal chain, the gain is about 8db, so it is not a buffer. For convenience, it does...
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Thank you Romy! Actually I've realized that when I wrote it I rather ment dynamical stability then frying the outputs. But in proper PP the even order harmonics are strongly surpressed, sothere should be no or very little change of the output OP due ...
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The sockets for 6c33 should be here in a few days. Meanwhile, I fired up the 6ep5s. I labeled them ABC. The B sample ('83) with gold wire has a short or something. The other two look fine A ('63) has a little more output than ...
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(Romy feel free to move this post)[quote user="Paul S"]N-set, I understand you do not mean to hijack the thread with the Axiom, so I actually tried to make generic and/or thread-related observations. I don't know the 6E5P, but generic issues with sp...
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Looks like another case where clean AC wall power is demanded and supposed. Since they use triode output, I wonder if the "gain path" of the pentode is "wired triode", as well, or if they just want the extra gain to scrub in the upcoming RIAA; or ma...
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actually I agree with Romy, to a degree.... If the amplifier is a push pull device, using my output and input splitter devices of course, then an interstage transformer is a much better choice than rc coupling. Using transformers designed to the crit...
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Romy, that 6C33c is also only running one triode...you also have the option to wire up the other filament to increase power if required....
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I would agree that the Lowther is not hard to beat but the question is where and in whose mind does this competition exist? Is the Lowther, Manger, or other full range single driver in competition with different multi-driver approaches, other single ...
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Hi Romy,
I did the review on the AcousticPlan amp, called the "Santor". It is indeed a two-stage amp using 4 6922 tubes in parallel to drive a high Bias Mosfet output stage (it is class A to approximately 15 watts and runs very hot). It ...
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A few weeks back as I got the Schaub & Lorenz I pulled the pubes out and measured them on my tester. The tubes were very week and the output tubes were semi-dead. The Schaub uses a pair of ECL82 tube in output stage. The ECL82 are triode-pentode...
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[quote user="Romy the Cat"]Brian, and how do you find your MOSFET behaves compare the 12AX7-based cathode follower?[/quote]Romy, I have yet to try. Only got them on recommendation very recently. They're cheap enough to try in a B9A plug-in without al...
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[quote user="vuki"]Anyway, my plan was to make powerful triode NFBless amplifier for relatively small money. I'm really satisfied with what I did. Maybe I should have done GM70 SE, but what would be my next project then?[/quote] The GM70 is a bitch a...
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Paul, don't get me wrong--normally I'm not choosing a tube by the power, but this situation is somehow special.There are very few tubes which have the right electrical parameters (gm, mu, power, etc) to start with. In thesmall tubes word one can glaz...
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[quote user="Romy the Cat"] ... did anyone have an OK sounding amp with ½ 6C33C ...[/quote]The 6C33C has only one pin that connected to both plates. Since I use ½ of 6C33C in my MF and UpperBass channels then I theoretically burn just a hal...
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N-set, I understand you do not mean to hijack the thread with the Axiom, so I actually tried to make generic and/or thread-related observations. I don't know the 6E5P, but generic issues with specific DC tank circuits and driver and output tube stab...
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The preamp has the classic tube regulated power supply using 5R4, 6AS7, 6SJ7. It is transformer coupled output and has no capacitor in the signal chain, the gain is about 8db, so it is not a buffer. For convenience, it does has a remote control. It i...
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[quote user="JJ Triode"]Romy, take a look at EML 30A and its cousins:
http://www.emissionlabs.com/datasheets/EML20B.htm [/quote]
Yep, thanks, JJ. Still the EML 30A has a lot of gain but it has also very high plate impedance as well. As much gain w...
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[quote user="hagtech"]As usual, they leave out the VacuTrace, by far the best modern day tube tester. [/quote]Interesting, Jim.
I was not in the market for tube tester but I looking at your tracer I fugue out that I might sell a few my chea...
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[quote]BTW, Jim, when will we see your version of amp with 6E5P driver? :-)[/quote]Well, I have to admit it makes a beautiful triode. Wonderful linearity, low output impedance, and super-high gm. Looks a lot like the 6H30, which was my dr...
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I'd rather look for the FM magic, which I love and adore, in the modulation/demodulation process than physical field propagation. Perhaps FM process creates a stable, ~1/n harmonic spectrum like a triode? ...
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[quote user="Romy the Cat"] The HF Range “F” channel: The 6E6P-DR at 30mA connected at tetrode. The filter is second order with Sowter 9858 Pultec MEQ-5 EQ Inductor 420/277/145/108/61/34 mH) and variable air cap. The variable inductance and capacitan...
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Paul, unfortunately this charge/discharge effect applies to ALL reactive components. Not onlyto the interstage but also to the amp-speaker coupling.2Hz is easy for an RC coupling, now go ahead and try to design a full-range OPT with such a low -3dB!...
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Hi,[quote user="morricab"]As to the best transformers souding more transparent than the best resistors, I'll believe it when I (don't?) hear it. You claim to have heard this but I most certainly haven't. [/quote] Well, the claim is no...
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[quote user="Paul Costa"]I have a PDF file of the manual if it interests you to read it, I can email it to you. The unit weighs 80lbs, uses 6 6sn7's. What I found a little odd was the spec for the phono is it says : MM Phono Stage Gain: 64 dB at 1 kH...
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[quote user="Johann"]Hi Romy,i want to use the 6E6P-DR (triode mode) as driver in my tube 45 amp.I use a D3A (triode mode) with Anode choke at 180V, 12mA. Grid 2 is connected via 50 Ohm resistor to anode. Grid 3 (pin 8) is connected to cathode.Th...
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Consider a triode connected 13E1. 95W dissipation, will probably work beautifully with the existing OPT if you adjust the gap down and if you can rewire your arrays to present a somewhat higher impedance.Something like 400V-450V / 200mA-ish will ...
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Yeah, I'm a little slow here. Had very busy week pumping out machines. I do have two custom tube adapter cards built. One traces two separate 6e5p at same time (great for comparing). The other is for 6c33. So it's just a...
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I was rummaging through a pile of tubes and came across a pair of 8233. Medium size tube, gold pins, PQ. I think it might have been a video output tube for an old Tek scope. So I looked it up on Duncanamps. 10W plate dissipati...
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Hello first, as I am new on this site...
I have tried a number of high Gm pentode/triode tubes, including E55L and, of course, 7788. All are very linear when used as triodes, but do not bet on very low noise, if that is what you would be after. Th...
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I'll buy some more 7788 and give them a try. I'd hate to change tubes at this point. My triode connection has pin 8 (g3) to anode, not ground). I wonder if that makes a difference. Also, the power supply chokes are nearby, per...
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