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tremolu--(at)--ol.com (Tremolux) wrote:
>As opposed to working on a knockoff of the Tung Sol 5881 (yes, a very good
>tube), it seems to me that they (Svetlana) would be better spending their
>time trying instead to replicate either the RCA or Sylvania 6L6GC. The
>current production "Sovtek" 5881 is good enough for 5881 requirements.
>What we really need is the more powerful 6L6GC, not another 5881.
Actually, the Sovtek 5881 is a misnomer. It's a 6L6WGC, not WGB. A more
accurate number to describe the tube would be 7581A. A friend and I have
both run tests on the Sovtek 5881 up to see where its plate starts to glow
and have come up with a figure in the area of 40W of dissipated power before
you start to get the "red plate special" effect.... They handle really high
voltages well, and are probably good to about 600V without any real big
problems, as long as quiescent current is kept within a plate dissipation of
30 to 35 watts. They also make a decent sub for a 7027A, provided you tweak
the bias to suit, and up the screen resistor a bit. In most Ampegs, you'd
need to swap a 470 ohm screen resistor with a 1k at a higher wattage, and
adjust the bias to a little bit warmer idle current, as the transconductance
of the Sovt. 5881 is a little bit higher than a 7027, on average.
>Additionally, a decent 6V6/7408 tube from the Russians would be welcome.
>The current "Sovtek" 6V6 is built rather lightweight, and they just don't
>cut it in the old Fenders that hit them with 420 volts. Reliability is
>poor. Again, a replica of the old RCA 6V6 would be welcomed.
Or a nice Tung Sol. Their current 6V6GT is actually an old Russian type that
has /similar/ specs. The voltage rating isn't one of the really similar specs,
I guess....
>Lastly, we need a Russian alternative to the Chinese made 12AT7. I
>received email from a guy in the Moscow chapter of some hi-fi group, and
>he assured me that the Russian factories already made a tube that would be
>a good substitute for our 12AT7. He (nor I) couldn't figure out why
>someone like Matthews doesn't import them.
Well, if he gets enough noise about it, maybe he'll do it.....
Dutch
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