[AMPS] Clipperton L & Bad tubes
km1h@juno.com
km1h@juno.com
Wed, 7 Oct 1998 11:58:49 -0400
On Tue, 6 Oct 1998 10:02:49 -0700 (PDT) david wintheiser
<w0opw@yahoo.com> writes:
>
> Here's why I made that suggestion. I have a Dentron 160-10L, the
>older brother to the clipperton. It has a 2200 volt plate transformer
>and was designed for 4 811a's . The rather crude owners manual
>advises the user to replace the 811a's with 572b's for mucho power/Qrm
>!. I'm converting it for 2 572b's.
That amp blew 811's at a steady rate, even at 1700V under no load.
Upgrading to 572Bs was recommended. Later 160-10L's had a tapped xfmr
that could be selected for either tube.
> Info on the Web(AG6K ?) states that 811a's and 572b's are swappable.
Dont believe everything you read without understanding. The 572B can be
used in place of the 811 in most apps but the reverse is not often true.
Except on 27 MHz of course where anything goes.
>I think the newer manufactured 811a's handle the higher voltages just
>fine.
You "think" or do you know? Specs on Svetlana and Chinese 811A's say NO,
not maybe or I think. US made tubes were never speced past 1750V max and
1500V operational.
73 Carl KM1H
> - Pat W0OPW
>
>
>
>
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