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Re: [Amps] Alpha 91b problem

Subject: Re: [Amps] Alpha 91b problem
From: Ken Claerbout <>
Date: Mon, 21 Nov 2022 07:58:52 -0500
List-post: <>
 "I tested all the bad 425 transformers and each one faulted the exact
same way.  At least they were consistent."

Same here.  I have two bad transformers from K3ZO's amps if anyone is
looking for a boat anchor or paper weight.  Both had the same failure,
but I can't locate my notes to see what it was.  I can dig it up if
anyone needs it.

Ken K4ZW

On Sun, Nov 20, 2022 at 9:33 PM gudguyham--- via Amps
<> wrote:
> Rob, the TenTec 425 also had trouble with shorted transformers.  I must have 
> replaced at least 4 transformers in the 425 power supplies.  If the customer 
> was a SSB and casual CW kind of guy I would retrofit an Ameritron AL800h 
> transformer in it.  That transformer cost $249.00 at the time. Worked great!  
> One guy insisted on a Peter Dahl replacement , cost him $800 smackers.  I 
> tested all the bad 425 transformers and each one faulted the exact same way.  
> At least they were consistent.
> Sent from the all new AOL app for iOS
> On Sunday, November 20, 2022, 9:07 PM, Rob Atkinson <> 
> wrote:
> The reason Hammond is the only source is that they purchased the PW
> Dahl plans for ham transformers from Jeff K8CQ.  He bought the IP from
> Dahl, not the rest of the business when Peter went SK.  For a time
> Jeff took orders and had MagCap in Boston actually make and ship the
> iron.  But after a few years of that he sold the Dahl IP to Hammond.
> That's where we are today.
> The old Ten Tec in Tennessee had a similar problem with the
> transformer in their Centurion 3-500 amp.  They were making their own
> transformers in house.  The windings would short out and I think they
> knew about it but refused to admit any defectiveness to customers.  I
> had one of those amps and went through two of their transformers
> before I ordered the Dahl equivalent and never had a problem after
> that.
> Rob
> K5UJ
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