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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Perhaps you are right. Buying out tubes from manufacture is a secure way to go. Still, I abandoned this practice in 2002 when Lamm sold me a pair of 12AX3 for his L2. When I got them one of the tubes was with paces of metal riddling inside. I figure ...
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I do not know if Russians still make them. I do not think they do as they hardly manufacture anything nowadays. I presume that there a large stock of them in Russia as Victor Khomenko (from BAT) told that during the peak of the 6C33C production Russi...
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While my Obbligato caps are traveling from Asia and instead of finish my MF amplifier and listening it I am blowing up my steam about the amp at my site there is a subject that I would like to share.
Melquiades MF DSET is made to utilize not o...
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[quote user="drdna"]As I had been looking at all these tubes I began to also inspect their interior construction. This will amuse you: one thing I would do is to hold the tube right up to my ear so the glass would be touching and thus mostly damped. ...
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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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The name of the post I took from the 32th chapter of M. Bulgakov’s Master and Margarita, so from there will be the epigraph for this post:
“Gods, my gods! How sad the earth is at evening! How mysterious are the fogs over the swamps! …So...
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True enough, the 80s 6C33Cs had a much better percentage of acceptable tubes. Not so lucky with other tubes. The point, however, is that one should always try the tube before taking more drastic action, since tubes can and are known to fail in succes...
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[quote user="Romy the Cat"]The contemporary productions DHT tubes (Russian of Chinese) are superbly firm and have no internal noise when they shacked or hit. The mintage 60 years old tubes what you make the “close to ears” test responses like as some...
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[quote user="Jack 14"]Hi, these ones are Russian military stock: see that no mica elements have been used in their construction, like the US Bendix Red Bank tubes (used in US ICBMs of the '50's-'60's). Old Soviet ICBM spare stock ?[/quote]It's v...
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After burn-in the heater for 24 hrs, I tested all 3 Golden grid tubes on a bench power supply , 2 of the tubes worked fines, 1 tubes does not have current. The tube seller gladly refund for the non functional tube.I talked to a 6C33C OTL amp manufact...
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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 for only about 1 year; in this case I estimate about 300 hours, althou...
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The concept of self-testing boot cycle is nice one but it for sure could not be done during the amp booting. Some tubes do need to warm up and reach the cruse temperature in order to be tested, some do not. Some tunes (like 6C33C) in fact is best to...
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I do not have a lot of equipment that uses vacuum tubes I have a phonostage and power amp that are tube based. The phonostage used 12AX7 that in there from 1999 and I think they will survive me. The power amp use gas tube 0A2, the output triodes 6C33...
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[quote user="KOTriode"]Romy,I have good confidence that it was the tubes and not the circuit. I have checked the cathode driver that bias the 6C33C and there was not any problem. Sure if the cathode bias failed, the 6C33C current will shoot way u...
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Romy,I added the fuse recently just for protection for the output transformer since these 6C33C tubes plate current can get very high and might damaged them. Also DC coupling on this high gm tube can cause plate current to go max if something failed....
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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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decoud, as I have mentioned before, over the years I've always gotten about 25% bad ones of tubes from all sources, including those that were supposed to be hand picked, triple-tested, high-spec, precision-matched tubes that (of course) cost extra fo...
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Brain, C’mon, I was kidding about the “Electron Intensification Interface”! There is nothing in this phonocorrector then a correct selection of tubes, thier proper (well almost proper) use and selection of the specific topological decisions that sold...
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Paul McGowan is a regular poster on youtube. I have to take his presentations with a grain of salt as they always conform to sales pitch for PS Audio products, but they are interesting. Recently, he asserts that tubes in preamp stage will provide h...
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I have been fighting the electricity and getting off-track enough to find it wearying, not to mention the silliness with the tubes. The other day I happened to drop a double album and it hit dead flat on the carpeted floor. The mute was of...
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[quote user="Romy the Cat"]Did anyone ever see the ready to do tube sockets adapaters that would let to pit the large gas tubes ingot the small sockets? Melquiades use 7-pin small 0A2 tubes but I would like to try the 0D3. They are the same 150V tube...
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Hi Dirma,Unless you can prove me something else: the ones I have (0C2s and 0B2s) are printed "Made in USSR" very clearly.I doubt that Canadian General Electric, or Sylvania, put this lettering on the tubes to conceal another ...
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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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I am serious, Paul. Reading your tail of straggling with ML2’s tubes and tubes’ sockets I suspect that something is very fishy doing on with you. There is absolutely NOTHING might be with ML2 tubes sockets. You reported that the second stage of ML2 h...
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Paul,The gain of my phono stage has the RIAA loss factored in. Without the RIAA loss counted, the gain would be about 66-68 dB. [quote user="Paul S"]I have never used the 417 or 437, but I have heard plenty of whining from folks who do. They often p...
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I have seen some people built 834P with alternative input and output tubes but I never heard them. I personally tried all imaginable 12AX7-type tubes (AZ, AT, AU, 6N2P and many others) in 834P. Some other triodes were king of better “here and there” ...
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ZZ, I'm thinking, ramp up the properly-sequenced DC first (and perhaps we go on from here to the earlier-discussed matter of heating and shutdown sequences for each tube...). After that, when I send signal, I start low and ease up on the volume until...
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I unpacked the Gold Grids 6C33C that I got from Bulgaria. Upon very meticulous inspection I did not find that they were in any way different then the regular grid tubes. I did not open a tube to check it further. It is possible that the Bulgarian gu...
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[quote user="KOTriode"]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 ...
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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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