[Amps] re: 572B

[R.Measures]

On Aug 28, 2004, at 12:02 PM, Eric Dobrowansky wrote:

> Maybe you need to increase the cutoff voltage, as the amp may be 
> oscillating
> when unkeyed.

If a tube or tubes oscillates in any bias state, the problem is not the 
bias-V.

> 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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>
Richard L. Measures, AG6K, 805.386.3734.  www.somis.org