On 5/07/2013 6:25 AM, Dave Hachadorian wrote:
A friend of mine blew one of the filter capacitors in his
AL-1500.
Yeah and I know why. There are 8 x 450V rated capacitors giving a total
working voltage of 3600V, in that bank. The plate voltage in that amp
is, at most times, higher than that. Up to 300V higher.
A pretty marginal design, to say the least.
I replaced all 8 caps in my amp, to 500V rated units and added a few
more microfarads in the process. I now have a bit of headroom in the
voltage department and a bit better dynamic regulation, resulting in
more Watts out for the same amount of drive. So far, so good.
73, Alek. VK6APK
As I remember, the entire filter capacitor board, with
capacitors and resistors installed, was very reasonably priced.
($180?) I suspect that their Rectifier Board is also reasonable.
The techs at Ameritron are very friendly, knowledgeable, and a
pleasure to deal with.
The AL-1500 manual, with schematic, is here:
http://www.qsl.net/4/4x6on/RADIO%20MANUALS/AMERITRON/AMERITRON--AL-1500-User-Manual.pdf
Dave Hachadorian, K6LL
Big Bear Lake, CA
-----Original Message-----
From: Stein-Roar Brobakken[LA6FJA]
Sent: Thursday, July 04, 2013 5:31 AM
To: amps@contesting.com
Subject: [Amps] premade HV rectifier board
Hi
Does anyone know a place to buy premade HV rectifier board etc
for HF
amplifier?
73s LA6FJA Rag
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From sunny Binningup, Western Australia.
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http://www.qrz.com/db/vk6apk
http://www.qrz.com/db/vk6ap
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