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Re: [Amps] premade HV rectifier board

To: "Jim W7RY" <w7ry@centurytel.net>, "Alek Petkovic" <vk6apk@bigpond.com>, "Dave Hachadorian" <k6ll.dave@gmail.com>
Subject: Re: [Amps] premade HV rectifier board
From: "Carl" <km1h@jeremy.mv.com>
Date: Thu, 4 Jul 2013 21:21:25 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>

I put a WD7S power supply board into my AL-82. Works perfectly. It has 10
caps on it. It also fits perfectly into the AL-82, AL-1200 and AL-1500.

You could probably even put the transformer on the "high tap" if you wanted to.

73
Jim W7RY


And fry the filament faster....

Carl
KM1H

-----Original Message----- From: Alek Petkovic
Sent: Thursday, July 04, 2013 4:18 PM
To: Dave Hachadorian
Cc: amps@contesting.com
Subject: Re: [Amps] premade HV rectifier board



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.

Family Businesses:
Petkovic Air&  Gas. petkovicag@bigpond.com
SP Electrical. www.spelectrical.net.au
Hampers by Hand. www.facebook.com/hampersbyhand

http://www.qrz.com/db/vk6apk
http://www.qrz.com/db/vk6ap

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