I gotta 6L6 I'll send ya will that help?
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of John.
Sent: Tuesday, July 10, 2007 12:46 PM
To: STEVEN & NANCY FRAASCH
Cc: amps@contesting.com
Subject: Re: [Amps] Clippertion L 572B tubes
Thanks for the info, The amp does not have any tubes in it and I have
none. Would like to find at lest one to start the testing.
Thanks again de John KØCQW
STEVEN & NANCY FRAASCH wrote:
>Don't go too crazy replacing tubes. More often that not, a tube is still
quite good after years of use. Assuming that the filaments are wired in
parallel, plug one tube into the amp at a time, key the amp and monitor
quiescent plate current. The resting current should be within 20% of the
group mean. If you have an assortment of tubes, I would match them for
resting current (again, checking them one at a time assuming filaments are
parallel connected). If you have an extreme outlier that has low resting
current, I would suspect that it is weak. Use tubes with similar gain
together. The RF transistor industry used to do this by marking BJTs with
an ink to indicate Beta grouping.
>
>
>
>
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