[Amps] premade HV rectifier board

[Jim W7RY]

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


-----Original Message----- 
From: Alek Petkovic
Sent: Thursday, July 04, 2013 4:18 PM
To: Dave Hachadorian
Cc: amps at 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 at 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 at bigpond.com
SP Electrical. www.spelectrical.net.au
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http://www.qrz.com/db/vk6apk
http://www.qrz.com/db/vk6ap

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