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Re: [Amps] Alpha 91b problem

Subject: Re: [Amps] Alpha 91b problem
From: Alek Petkovic <>
Date: Tue, 22 Nov 2022 07:09:03 +0800
List-post: <>
Likewise here Rob.

For my friend's amp, before he decided to bite the bullet and buy a new transformer, I had two toroidal transformers custom wound. Each had a HV winding and the the other voltages were split over the two transformers. The combined result being a much more substantial transformer, built for 50Hz operation. Another friend has a sheetmetal shop, so I had him fabricate the box. The connectors were removed from the busted transformer and so we had a plug in outboard transformer box ready to rock and roll.

I still have the whole kit here. It will probably never get used as I'm very unlikely to ever build a tetrode amp.

73, Alek, VK6APK

On 21/11/2022 6:33 pm, Rob Atkinson wrote:
Yes EPD is a good outfit, I agree.  Ten Tec made their own iron to
save money because they were cheap.  They had a guy on the payroll who
did nothing but make their transformers but then he quit and went back
to where he came from (Canada?) not sure and I don't know what they
did after that.  I heard they originally used Dahl iron but quit him
because he was too expensive.  In those days I wanted the replacement
to fit in the box and I sent it to them and had the Dahl transformer
shipped to Sevierville.  I think I paid Dahl 4 or 5 hundred dollars.
The Ten Tec service guy actually argued with me.  They didn't want to
put in the Dahl transformer.  He insisted there's was okay.   After
two crap outs I wasn't a believer.  I had to order them to use the
Dahl transformer.   Nowadays I don't care if it fits or not.  I'll put
anything that works outside in a box and run wire to and from the
cabinet to it like with other amps such as the L4B.

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