One way to do this (externally - I'm not familiar with the AL-811H) is to
'buck' the primary voltage using a 6 or 12V transformer output winding in
series with the ac primary feed. The current drain on the 6V (or 12V) is only
(!) the primary draw of the AL-811 (10A average, 15A peak??). You get a direct
subtraction (if you do the phasing right!) so a 6V transformer would give you
120V - 6V or 5%'ish reduction. Etc.
Bob, WA2CKY
________________________________
From: Tom Osborne <w7why@frontier.com>
To: amps@contesting.com
Sent: Sunday, February 9, 2014 11:18 AM
Subject: [Amps] AL-811H plate voltage
Hi All
Is there a way to decrease the plate voltage in an AL-811H without using a
variac?
My line voltage is around 120v or so and the plate voltage in my amp is right
at 1800 - right at the red mark.
With caps rated at 1800 volts, that seems to be pushing it. I do have it set
for buck/boost now. Thanks and 73
Tom W7WHY
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