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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="anthony"]Looks like I
spoke too early. When I made that statement I'd only tested the voltages
in the DHT Channel and they were pretty close to correct...but when I put a
tube in there it glowed a little too hot so I quickly shut it ...
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Actually, it says the Level 6 will process "anything" from 44 to 192, 16 to 24. If that means it could read "native 48" and other pro recording formats, then that MIGHT be nice, and it would certainly unclog this thread. As can be seen here, it's...
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[quote user="Paul S"]Meanwhile: If you are going to use a SUT, this actually is a Big Deal that will profoundly affect the Sound you get from your system, regardless of which connectors or solder you use. I recommend you integrate the SUT (with its ...
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It sounds as though C10 is OK and correctly connected. C2 is OK as well considering it is in parallel with a 30k resistor. The next thing I think, is to turn on the amplifier with both tubes in place and check the current through R21. If R21 and henc...
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HP means high-passing, right? In Melquiades I do it by changing the coupling cap between the stages. You can do the same in ML2. To unsolder the cap from ML2 is pain in ass but you might juts clip one of the lead and solder another smaller cap next t...
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[quote user="Romy the Cat"]I think it is about right. The 6C33C for upper base has 100K
biasing resistor and 20K to ground in Lpad. That would make ~60Hz. This high
pass that unload the LF from the horns that it can’t handle is very important
as y...
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It look like the project progress well. I have a little concern
about heat the will be building up in your PS enclosure. I do not know what
kind ventilation hole you have in there but be advised that it will be quite
hot. In worst case you mig...
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N-set, I am sure you realize by now that I do not properly understand "electronics". I see the "diodes" in the Chimera circuit as a sort of "active" bias that is also dynamic proof against blowback/ripple to and from the tank, at each of three "...
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Some people bias 833 at 0V. Some in A1 but to get teh stated powerit must go into A2. Do you or anyone have normal plate curves for 833 instead of that multiampidiocy usually published? Say up to 200mA. Same for 304tl.Outpur tranny--this is the funct...
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Well, one way or another I will fix my B2 amp. I think while I have no bass amp it would be a good idea to try other amps for ULF: powerful tube amps or even class D amps. I do not have inspiration to dry Class D amps and I have no powerful tube amp...
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Jim, I have sent you the tubes – it might be an interesting journey.
I send you:
1) 6C33C that was working with both cathodes approximately a year. It is not dead year but it is deep into retirement age. Run it at 220V and 200-250mA full-tube,...
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I read about the GU-81 penthode. It's probably a good possible solution, thank you.I haven't so much experience with penthode, from my very few experiences, I felt better with triodes (DHT or IDHT), so I prefer don't take any risk.I feel more and mor...
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In this cable thread there are some ideas about materials and construction of cables. My most recent attempt for good-sounding shielded phono cables are from Bud Purvine, using his specialty Litz wire construction, Vampire 800C connectors, and unblea...
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Romy,Could you help me understand your biasing scheme with this version? I thought I understood the original Milq circuit - but the only channel that looks like that to me is the D channel. I don't get A and B at all! what is the 50 ohm resistor doin...
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...but resistor between screen grid and plate, to my hearing, makes sound slightly unnatural, especially in highs.But this may be not true in your case (i didn't try to use this resistor with 6E5P, only with other power tetrodes), so i think i'll sug...
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ml8 wrote:"This few tubes was 6E5P, 6S45P (which i've found a little better for my single-stage amp that 6E5P) and... perfectly god-like sounding (output beam tetrode) 6P6S!!! Triode-connected, for sure. Absolutely the MOST clear sounding driver, and...
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I have never used EL34 in triode, but I think it is not hard to find acceptable examples of this fast, reliable tube, and with conservative bias it should let your 6E5P "shine through", if that's what you want. Nothing like 811, 845, etc. in this re...
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[quote user="Romy the Cat"]3) There is an army of the 150V 7-pins gas tubes: 0A2, SG1P, STV150/30, StR150/30, 150C1, G150m 150C2, 150C4, CV10664, CV1832, CV2903, CV8161, HD51, M8223, QS1207, GD150/4K, QS1210, SR56. I did not try the larger octal 150V...
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[quote user="drdna"] I think this 2A3 must have a specific set-up to sound its best. You have not found it yet. To begin with and familiarize yourself with the sound of it, I suggest sticking with the topology that has been tested by amplifier design...
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Jim, what is operational point of the 6E5P, what it drivers (how it coupled) and how do you bias the 5E5P? BTW, the clipping at the bottom is very good, very symmetrical. Try to measure which stage clips first: the driver or the output stage. One m...
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Well, since I will not experiment with many of them I'm kind of narrowing down the scope of the amps that I would like to get. In 70s-80s break there was a short period of time when Yamaha and Sony made top of the line amps around V-FET output t...
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[quote user="Paul S"] I have stated several times that the ML2s are less sensitive to bad electricity than my phono stage, and this is true. However, this is not to say that the amps are immune to bad electricity. In fact, it is the effects of bad el...
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I see the point, thanks a lot for your comments. Playing with the phono I've somehow come to a conlusion (possibly wrong) that my ham is an electrostatic air pick-up from the PS. During the operation both PS and signal boxes are very closetogether an...
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Yes, you are right, the voltage divider from 6.3V across 47K and 10K resistors shall give not 0.9V but 1.1V. However, the numbers that are in circuit are not something that I saw in my dreams but the actual numbers that I measured. I might presume th...
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Hi N-set,Yes I added big cap bank to the second stage cathode. Yes it is possible to use filament power supply for fixed bias like Romy did.But I have a stereo EAR834p with a single filament PS. So, I was afraid that one PS for both channels can caus...
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I have followed the comments on this speaker and have been quite amused with the whole ridiculous concept. The theory they sell on the port or horn or whatever you call that aluminum contraption is more consistent with water ...
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Sarurntube, I am quite curious about the mysterious tapped horns these days. What are the physical dimensions and power requirements of your tapped horns? Are they 1/4 or 1/8 wave horns? Do you use a FR amp or a sub-only amp to drive them? Do you...
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Hm, in an idea come to me today I think I will try very soon. Why do not combine my Injection Channels with Horizontal Bias Channels? Since my Injection Channels have HF transducers then it will introduce a tremendous lobbing BUT… But my Injection Ch...
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I think the true definition of good enough is not located in
sonic domains, certainly not in audio domain and not even not in musical
domain. I know a few guys in past who here very high caliber technical interpreters,
high-level directors, CTO an...
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[quote user="Paul S"]Lamm did choose to use some of the driving ideas from his proven SET amp…[/quote]Yes and no. ML3 design wise, as I understand is, in fact is not as interesting amp and it might be otherwise. Vladimir went for the target marke...
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