|[AMRadio] 6U8 Subststute?|
jcandela at prodigy.net
Sat Nov 10 17:59:26 EST 2007
----- Original Message ----
From: jeremy-ca <km1h at jeremy.mv.com>
If the 20A is running them too hot then I'd check out the circuit for
something causing excessive current drain. I used a 20A decades ago and
never had that problem.
Reply by Jim WD5JKO:
Carl decades ago the line voltage was closer to 110-115 vac whereas now it is closer to 125 vac. A stock 20a plugged into todays AC mains will literally "cook" the tubes. Sure a variac is the right choice here, but the poor 6u8A is still the weak link. The 6MU8 is just a beefier alternative.
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