[Amps] premade HV rectifier board

[Carl]

Well, its certainly no secret who designed that board and then claimed all 
the caps were pre screened at 475V.....
Ive even had NOS ones bought for repairs fail at 430-440V

Carl
KM1H



I can say that the WD7S is the best board to use..I have put two into 
AL-1500 and it will fit..I have a extra board and all the parts if one wants 
to go that way..Who ever designed that P/S board for the AL-1200 and AL-1500 
was not thinking right!!! Bob

Bob Gibson W5RG

From: Jim W7RY <w7ry at centurytel.net>
To: Carl <km1h at jeremy.mv.com>; Alek Petkovic <vk6apk at bigpond.com>; Dave 
Hachadorian <k6ll.dave at gmail.com>
Cc: amps at contesting.com
Sent: Thursday, July 4, 2013 8:46 PM
Subject: Re: [Amps] premade HV rectifier board


Why would you fry the filament by turning up the plate voltage? The plate
transformer and filament transformer are separate.

Jim W7RY


-----Original Message----- 
From: Carl
Sent: Thursday, July 04, 2013 6:21 PM
To: Jim W7RY ; Alek Petkovic ; Dave Hachadorian
Cc: amps at contesting.com
Subject: Re: [Amps] premade HV rectifier board


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