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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Romy,The normal bias for the Golden Grid tube for 200V Plate at 200ma is about 70V-80V for the good tubes, the bad tube read 0ma at this bias, when drop to -30V it start reading some current, but can't get to 150-200ma current for the SE amplifier.Th...
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Paul, would you think 6336 will be more stable/predictable?Have you had any experience with it?30H: sorry, forgot to mention that the PP pair is autobiasedwith a common 900R resistor...EL34: indeed it's a very popular tube for driving Stax electrosta...
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Chris, at this point it is hard to say anything defiantly. Subjectively it sounds like the Super Milq has slightly less HF extension and transient then the regular Milq, although the output transformer of the HF channel of Super Milq runs higher and ...
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Lamm has been talking about his GM70-based amp for many years, buttering the subscribing to his speeches public. I do not know what the status in there but I would not expect anything relatively interesting. There are many objective reasons why I do ...
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I always was “concerned” about those large high voltage triodes: 211, 845, GM70…. They kind of different… The 845 always was brutal and not elegant, 210 was elegant but not sophisticated, and the GM70 was sophisticated enough but no one build a...
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There is also something to be said for continuity, so one does not wind up with a lot of "optimized" parts. I wonder whether having a different tube "signature" for each "channel"/driver would work out. It's been a while since I multi-amp...
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It is it, I eventual got what I was striving for a while and now my MF DHT channel is done and the most important is that it now sounds exactly how I need it to sound. The new 25:1 loading turned out to be the key. It is “fast” enough and I did n...
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Be careful to relieve me if I am not impressed, many promised no one excelled. :-)
Chris, I do not think that you will see me to think about transformers for other channels. I do not think that what I do will be some kind of resolution for Amor...
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That's very interesting. Looking at the Melquiades i've always wondered about a few things. If you don't mind, i will ask you about them:1. If you think gas regulators make sound of 6E5P so nice, didn't you try putting gas regulator tube in the grid ...
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Jim, I did try the anti-phase transformer in the secondary but I felt that it did something to sound. I can not do it on primary as I have the pate coil for the first stage sitting on the same transformer. Regarding the sweet spot of the 6C33C - I ha...
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I like to use different sources and kinds of music for sound evaluations. For instance, I might use some interesting, well-recorded jazz, then move up to something more complex, as you have done. The jazz tells me some things pretty ...
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Well, I never seen it happens but who know – that might be if some use “violence” on tubes. The sad part is that to replace these sockets is difficult. I have replaced in ML2 the 6C33C sockets in ML2 - it was easy but the 5651 are PC board-mounted an...
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Paul-I only replaced the big 7 pin 6c33c sockets. If there was an easy way to access the small tube sockets I might consider doing the work while the amp is open. But my motivation is low - they haven't been a problem. that's got
to be a relief!Y...
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Actually those fantasies may come true one day...I may be wrong, but I thinkthe tube-speaker interface is more important than sticking to 2 stage topology?2 stage => high-mu output tube => high Rp, low controll over the array.But, if you insist...
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I am familiar with the fresh 6C33C behavior, and I do set bias much lower while burning them in. This set of tubes has been installed for about 3 months; the amps are operating about 45 hours a week. Before switching them on the next time, I'll t...
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[quote user="cv"]Yes, well - I wasn't really saying much; just a vague hypothesis. There is some tendency for lower Rp tubes, (and somewhat related) tubes with a certain harmonic structure, to sound more romantic, and hence impart that quality to mus...
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[quote user="Romy the Cat"]Anthony, I think you take the right this in a wrong way.
Sure the quality of the coupling caps is important but you truly shall not be worry
about it. Make the amp, get comfortable with it and then change the damn cap.
I...
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http://www.sitefile.org/showimage/6/6c33c.htm
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[quote user="Paul S"]So, does anyone know anything about "good" sockets for the ML-2s? I forget when and where I saw some sort of boutique Teflon jobbies that are pretty darned expensive. Maybe DIY Hi-Fi, in Hong Kong? Also, although Teflon is a ...
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[quote user="Romy the Cat"]Anthony,
First, your measurements again the “appropriate load resistor” has very little practical meaning. The
drivers is a dynamic system that has impedance not resistance and the impedance
varies with frequency. So...
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That was very interesting post, here are some thoughts of my about it.
[quote user="KOTriode"]Romy, No, the DAC was not set at maximum level (for best sound) while Cyrille listening to the system. It was set at normal volume for the whole sys...
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Jessie-There are the current japanese teflon sockets, and vintage american manufactured sockets - I think either should be fine. The pin springs on the OEM pair I replaced had no grip or spring characteristics. When the pin holders are bent, they ...
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[quote user="mark"]with reference to the LL1627a as used in full range application in melq.you mentioned a good choice gapped at 200 ma but i would prefer 300ma but they do not do it.i had k and k check with lundhal and they will do it and at the sam...
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If I say that it was horrible with San Audio 2A3 driven with buttery biased 6E5P then I really meant it. I got home today tune it on and it was so bad that decided that it shell not use it as is. Even though it an experimental amps but still it...
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[quote user="Paul S"]I have begun to see a pattern of diminishing net returns with respect to the smaller SETs, to the point where I wonder if their "potential" can ever be practically realized as Music in Full Glory. Lastly, the choice of an ou...
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[quote user="Romy the Cat"]You use Edgar’s refrigerator subs that use own LF SS amps (that use EQ of I am not mistaken), so you do not use the full advantage of SET LF sound.[/quote]You are correct, though I believe the subwoofer covers only below 40...
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A site’s visitor sent me a link about the $100 per socket:
http://www.jacmusic.com/sockets/html/Yamomoto.html
Despite of the semi-idiocy that is written in the promo material in the link the socket looks like the good one. I would personally would ...
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[quote user="Paul S"]I also wonder about the supposedly simple but ever mysterious procedure for matching 6C33Cs for gain. Presently, my amps are ~ 2 dB apart.[/quote]To do gain matching we need a way to measure gain. To be precise, we need to measu...
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[quote user="Paul S"] Does anyone know the voltage the big couping caps actually see? Yes, I should measure it, but I would rather avoid the drill of opening the amps, propping them up somehow and measuring if someone already knows the answer. Of co...
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Thanks for the rejoinder, including the corrections and tips, Romy.I well remember Lamm saying that we should junk our ML2s now because the parts are "worn out". While that does not cause me to think he does not know what he is doing it natural...
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