Re: [Amps] premade HV rectifier board

["Jim W7RY" <w7ry@centurytel.net>]

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:
> 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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