[Amps] premade HV rectifier board

[Alek Petkovic]

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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>    

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