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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="hagtech"]Romy, you were right. I just got in another pair of 7788 from eBay. This time, one tube has a little bit of microphony, not bad, really. The other was dead quiet! No ping at all. Very impressive, th...
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http://www.pmillett.com/pentodes.htmhttp://www.pmillett.com/images/pentodes.PDF...
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Hello Romy,
Quite clearly, a high Gm device will have a higher voltage gain than a lower Gm (for pentodes, gain is Gm*Rload if single ended) and this is something we are after in a MC stage. Noise performance is crucial and below I am analyzing a ...
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[quote user="Paul S"] http://app.audiogon.com/listings/omnigon-full-function-tube-preamplifier-phonostageLooks like a serious effort that has been kicking around for a while.What tubes are used? Are they twin triode, like 12AX7 or - more likely - 692...
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The ECL82 = 6BM8 was used a lot in low-end amps, both push-pull and single-ended. Actually, according to your radio's schematic to which you posted a link, they are not being used "one per channel," rather it is a mono radio (nothing wrong with that...
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[quote user="Romy the Cat"]I usually hesitant to give any recommendations for “improvement” if a request does not contain any defined and specific complain about the current results.[/quote]Naturally, this makes sense. My question was actually specif...
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A local construction guy named Michael Lally came up with some controversial theories in the 1980s about how the Egyptians moved large stones large distances and up the pyramids; rumor has it his simple and practical theories really bothered "studied...
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This post is a derivation from the following post:
http://www.romythecat.com/Forums/ShowPost.aspx?postID=11797#11797
What is interesting is that I have a few the same types of shields for small 7 pin gas tubes and I have tried tho...
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[quote user="Romy the Cat"]buy a box of Epoisses Berthaut cheese. Just one sniff of this French wonder will give you an instant reference about the YO186 sound.[/quote]La fromage de les Epoisses du Borgogne, c'est ma favorite. Bad news since the YO1...
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I suppose this further erodes my "credibility" regarding the "tube sockets" hysteria, but it is what it is, so here goes:Today I finally had the right combination of alone time and motivation (not to mention great electricity) and I got around to swa...
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[quote user="miab"]I'm about to place an order for some 12AX7 tubes. The GA 12ax7 tube you mention doesn't seem to come up in my search. Is there other info regarding this tube?[/quote]I am not sure but it is possible that General Electric never ...
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[quote user="Romy the Cat"] Spending some time listening carefully my new setup after fine-calibration I recognize some inaccuracies in my previous comments and some mistakes of my original objectives. Here are some observations I would like to m...
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I got new 6C33Cs for V2s from Lamm because no one else wants to match them, let alone match them for gain; but the loud thump through the speaker still happens just when one amp self-switches from warming its filaments to full-throttle oper...
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Keep the driver stage, the 6N6P, as new as possible. This tube is very critical for the given amp. You might get a tube tester and measure the mutual conductance but with the low price of 6N6P I think it is hardly necessary. I would change it as ofte...
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[quote user="Paul S"] Any ideas for sources for 6AK5 and 5651A? Seems like most of the ML2 tubes are "hard to find" from local sources. [/quote]
I do not know why you say it. Both 6AK5 and 5651 are very common and very inexpensive tubes. The 6...
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[quote user="morricab"]Hi Romy, KR audio is making high power SET and parallel SET amps using tubes designed by them specifically for low frequency amplification (read as in not radio frequencies). They are getting the power with lower voltages...
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Paul, there is a number of inaccuracies in your post.
[quote user="Paul S"]Lots has been written already about tube replacement, but I want to mention my recent experience when replacing the 6C33C output tubes (V2). I had the previous tubes in...
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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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The "better" 5751s got here and I took advantage of wifey's absence to listen at night. It was cool and the electricity was pretty good, just a little "dry", but no "cotton". Lazy boy, I still haven't fixed my DAC, so I have had only viny...
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[quote user="Serge"] Wouldn't you want to try some HF diffusing stuff on your back wall windows? Like wooden plank blinds if you see what I mean? Or you want the reflections to be catched earlier, behind the listening couch?[/quote]
Nope, it w...
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[quote user="Paul S"]20W from a 300B? What? I missed that. [/quote]Actually then call themselves Moonoblocks, it means that they use 2x300B for channel, probably paralleled or in SET PP configuration like Audio Mirrors does it. Still it is pushy fo...
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....may work here as small dis-sincronizations in pumping the current should not matter at ULF.But how much God would be in 121478521785 parallel KT2318 tubes?1/121478521785?One, max two big tubes is still more appealing to me, don't ask me why.I'm t...
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I got this week the last new tube for my Schaub & Lorenz. Since I got wonderful result with change of the output tubes I decided to swallow the bullet and buy all new tubes for this radio. My presumption is that as bad my original output tubes we...
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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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Nope, the Russian tubes generally much, in fact much worse than western equivalents. There were however some exceptions. Those options were due to various reasons. The tubes like GM70, YO186, 1P24B, 6E5P, 6N30P, BO188, GM57, UB180, 6C33C, 6N6P, M...
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Romy, et al, I got rid of my tube tester a few decades ago... yet I still need to match sets of tubes for equipment. When you consider many SE designs with no feedback loops, you need to match "sets" of tubes to get matched performance between ampli...
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Jessie, since I got my amps I have followed Romy's suggestion and recycled swapped-out V2s into V1 service. As it happens, I do not run V2s (or V1s) over a year, but I have had no problems of any kind that I can relate to following the annual V2-to-V...
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Well, I would say that “something is wrong” as what you report it is not how it shall be. I had my doubts about the rational to use 6C33C in direct heating coupling but the “danger” in direct coupling uselessly coming from the plate of the driver...
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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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