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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Somewhere in 1997-88 I bought a hundred 6C33C. I believe during those years the where more expensive then now and I paid around $7-8 per tube. Over the years burning the 6C33C in pair of VK-60 (8 tubes), two pair of Lamm ML2 (ML2), ML2 with Melquiade...
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OK, let me to recall. We learned that the “hysteresis” (for a lack of better world) manifest itself on used tube only. Also, what I see in the images the one of the half of the used tube has more “hysteresis” then other. I think it leads to the follo...
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Anthony, I know what you
feel but I am no sure that I might be too useful for you quest. Let me to explain
first the points you made.
I do not know why Placette
does not work in your situation. You do not have enough volume? If it is the
case ...
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You have this behavior with the tube that you run for 6 month? That is strange. The behavior you described (with this amps) is typical for a very fresh new tube but after 20-50 hours the amplitude of the current raise shall be minimum and and af...
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Last night I was listening Zubin Mehta’s recording of Bruckner’s Symphony No.9. It was his first recoding from 1966 with Vienna. I am not a big fun of this performance all together but it has spectacular first movement. It played superbly slow and s...
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[quote user="drdna"] Well, and I have a dozen of them sitting here next to my desk while I am building my Milq amp s-l-o-w-l-y so I guess I will discover my audio intelligence level sometime after the New Year.[/quote]
That is so cool that you...
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Well, it is not necessary a fully qualified urban legend as the problem does take please with fixed based 6C33C but..... only under certain conditions. I have written about it a lot on my site but will very briefly recall it again.
Dima might be cor...
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[quote user="floobydust"] Paul,I suppose that new vs old between the 45 and RE604 could account for some differences, but it's more of an "apples to oranges" comparison. Pushing the 45 beyond it's ratings is not a great idea... especially the cat...
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Laurent,
The V2 in 6C33C does NOT need to be matched by other characteristic then gain and it is very easy to do. If you have two V2 tubes and they have different entry points for bias but the same gains then you will not detect any sonic cons...
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Domidaw, you wrote: The photo shows the capacitor c10. Its minus is connected to ground, its plus goes to the output transformer,According to the schematic it is the grounded (minus) end of C10 that should connect to one side of the output transforme...
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I was thinking about the subject for a long time. People in audio love to make generalization, so do I, but in it is not so simple. People attribute to output tubes some “special” qualities but I more interested not about unnecessary drooling about A...
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[quote user="Romy the Cat"]That sucks. I use to have a box of perhaps a dozen of YO186 but I did not see it for a while, pretty much from the time I moved to new house. I was listening today some of my “critical” reference stuff and concluded with ve...
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Jim, returning back to the subject of tube testing….
I do not know if you have seen my most recent obsession; the idea of driving my Macondo with 1.8W of a single 6E5P:
http://www.goodsoundclub.com/LatestPosts.aspx?ThreadID=4241
So, what I learned...
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Without regulation, this amp would not work correctly due to its design: DC coupled and fixed bias. The high transconductance will make the bias current varied as much as 50-100ma due power line fluctuation without the regulators. It mi...
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This is by Hans Beijner. His site is: http://www.tubetvr.com/In 1976 a Mig 25 fighter jet landed in Hokkaido in Japan, it was flown by a soviet military pilot that wanted to defect to the west. This was a real field day for western miltary peopl...
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Hi all ! [quote user="morricab"]
Hi Romy,
Could you explain a little more about the amp? If I understand you correctly it is a 1 tube stage with solid state (Mosfet or Bipolar??) output. If it is Mosfet then it is likely to be running w...
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Well, the conflict you pointed might sound reasonable but not completely.
The First quote is taken from a thread “Disregard Digital with Vacuum Tube
output”. In there I advocated do not look into D/A converters with tube output stages.
In was in 2...
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[quote user="cv"] 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 / 2...
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Why do we use DHT tubes? it is not because of their technical specifications. They have low transconductance, a problematic direct filament, and they cost a lot.Obviously, it is because of their sound. Some people like it and some people don't.The DH...
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Thank you Romy, that was very informative and instructive!I don't completely agree that OP is absolutely irrelevant for linearity.It can happen that some regions, under given design constraints, will not give "a proposer harmonic structure of
your s...
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Ok, now it is done and it is official as I see nothing available for conceptual improvement in the crossover circuit. Interestingly this version offers the most interesting sound as well, since the circus was tune for sound, not vise-versa, it is wha...
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[quote user="Romy the Cat"]The events of the last 3 days are incredibly stupid, incredibly interesting and very educational. During the last few days I have discovered some very interesting phenomena, ok might be no a phenomena but a behavior, th...
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Just a brief note on my recent addition: Placette Active preamp. Due to a recent purchase of Tannoy Golds, I had the opportunity to pull an old McIntosh SS amp out of the closet recently. This amp has gain controls, so I tried running it ...
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[quote user="Romy the Cat"] For a casual observer it might appear that I am constantly fought with my ULF, finding and loosing better and worse configurations. It might be so but I have a very strong sense of objective of what I would like to ac...
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One more thing that I would like to point out in context of the recent Marc Mickelson’s review. Marc wrote:
“The Atma-Sphere amps are certainly more powerful than the ML3 Signatures, but not noticeably so unless you clip the Lamm amps. “
Here is wh...
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[quote user="noviygera"] What does this mean?
Let's say the OT is 5K:8 where is this loading coefficient coming from? And how
can it be adjusted? If the R(e) of a driver is let's say 12ohm, does this mean
the secondary of the OT must be 12ohms for...
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[quote user="haralanov"]N-set, a friend of mine built an amp with this monstrous USSR tube. It has 3 stages and the GU81M is driven by 6C33C. Within context of driving mid or high sensitivity bass drivers, this is all you need. In comparison, his pre...
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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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Hmmm - the whole LCR thing, I don't like the idea. I'll admit to having no experience of it, but in engineering terms, it just gives you a constant impedance filter. The EQ is still done by caps essentially, far as I can tell. I see the wh...
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It's hard to predict how the anomaly will sound. Sort of like a dynamic bias shift in the tube. That's why I think IMD. The shift moves around at LF rates, so the HF reproduction can fall on any number of load lines (within loop are...
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