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@centurytel.net>
To: Carl <km1h@jeremy.mv.com>; Alek Petkovic <vk6apk@bigpond.com>; Dave
Hachadorian <k6ll.dave@gmail.com>
Cc: amps@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@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@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:
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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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