Id say thats pushing the 3-500Z a bit too much. Drop the drive down to
60-70W and the grid current to 125-150ma and the tube will thank you by
working much longer. At 600-700W the difference at the other end is nil.
----- Original Message -----
From: "Kim Östman" <firstname.lastname@example.org>
Sent: Saturday, July 07, 2007 3:09 AM
Subject: [Amps] AL-80A tube glow
> I've been using the AL-80A successfully (apart from some rare arcing
> inside) for about 10 years off and on, including contests.
> Something that I've paid notice to only as of late in the 3-500Z tube
> is a gradually increasing orange or light red colored glow in the
> metallic cooler wings(?) as one sends CW of SSB during an "over". Is
> it normal for the tube to begin glowing like that, or is something
> The SWRs on my antennas are below 2:1, tube plate current around
> 450-500 mA (which I guess is stretching it a bit), and grid current
> around 200 mA. Output according to a Daiwa meter is between 700 to
> 1000 watts depending on the band.
> Thanks in advance!
> 73 / Kim OH6KZP
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