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Vacuum Tubes for Amps
5V4 for 5AR4
>>>Has anyone tried a GZ-37 rectifier? The tube is taller, but will
appreciably lower the B+ levels. This is a fairly common tweak to
ST-70's, especially when good EL-34's are in short supply.
For 6V6 amps, you can try using a 5V4 rectifier. It's like a lower rated
5AR4, a little more internal drop. Makes about a 10 to 15 volt difference
in the B+ compared to a 5AR4.
BTW, I use a 5AR4 in my Tweed Tremolux. The plate voltages are kind of
high (a little over 420), but the NOS RCA 6V6s seem to take it fine, as
long as the bias is right. This extra voltage gives me a solid 18 Watts
output at the onset of clipping. Not quite as powerful as a BF Deluxe
Reverb, but close. The Tweed Trem can generally blow away the Tweed
Deluxe.
Regards.
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