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
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