[Amps] re: 572B

[Eric Dobrowansky]

Maybe you need to increase the cutoff voltage, as the amp may be oscillating
when unkeyed. The Sletvana tubes require a higher cutoff voltage that the
original CETRON tubes.  Check out RFPARTS web site for more info - they have
a tech bulletin on how to use two diodes and a cap to get a new cutoff
voltage via the filament transformer.

It's been awhile,  but I had to mod two FL2100Bs for this reason.

Eric
KE2D