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6C33C and GM-70
6C33C and GM-70
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Old 20th November 2002, 11:28 PM   #21
SY is offline SY  United States
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6C33C and GM-70
I haven't used it yet, but it seems like a quick transconductance jig would be easy to throw together for testing it. And, depending on application, you could just as easily measure perveance. What else do you really need to know?

I'm still hung up on sweep tubes and Big @ss American Triodes (like 6528). When my last 6528 dies, I'll check out the Russian stuff. It *does* look intriguing, though...
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Old 20th November 2002, 11:38 PM   #22
fdegrove is offline fdegrove  Europe
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Well, yes 15 years ago already you got these japanese EC33Cs.
I did some testing on those and later the russian stuff but found them hard to work with.

They take an awful lot of time to stabilize,so much so as to wreck havoc elsewhere and cause thermal runaway destroying themselves in the process.

Keep in mind these where mostly post "cold war" leak throughs and I haven't toyed with more recent samples.

I find that in practice these offer a good alternative to more popular tubes but as far as I can find my 6080s' at low prices I guess I stick with these.

BTW,6528 isn't exactly easy to source either.
I think PENTA LABS still carries some.

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