[Amps] AL-811H plate voltage

[Robert Groh]

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 at frontier.com>
To: amps at 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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