Dan:
I stand corrected. Yes it is a FW bridge configuration. My senior moment
referred to a different amp which does have a doubler for the HV supply..
Thanks for pointing out my error.
73
Bob, K4TAX
----- Original Message -----
From: "Dan Atchison" <N3ND@aol.com>
To: <tentec@contesting.com>
Sent: Sunday, August 19, 2007 11:19 AM
Subject: [TenTec] Titan 425 Transformer needed
> Bob:
>
> The Centurion does NOT use a HV voltage doubler, at least not in the 422B.
> I use a Peter Dahl in mine and had them wind a few extra secondary turns
> to
> give me 2400VAC.
>
> Dan -- N3ND
>
>
>
>
>
> According to the Peter Dahl website,
> http://www.pwdahl.com/dahlcatalog/hamtrans011404.html#T, they have two
> transformers. $350 each for the Titan. One has a higher secondary HV
> winding than the other. They are 1270 VAC @ 1 amp CCS and 1800 VAC @ 1.2
> amps CCS. Both weigh 46 lbs. and the same price.
>
> For the Centurion, $325 and the Dahl website lists the HV secondary as
> 2225
> VAC @ 0.5 amps CCS. Now, that raises a serious issue. The Centurion uses
> a
>
> voltage doubler in the HV circuit. That configuration with the above
> transformer would be very unsatisfactory as a direct replacement as the
> rating of the filter caps and the tubes would be greatly exceeded.
> Otherwise, voltage twice what it should be and current about 1/2 of what
> it
> should be. If the transformer data is correct then the rectifier circuit
> should be changed to a FW bridge.
>
> I'd get clarification from Peter Dahl as to the exact specs for these
> transformers before I put one in my amp.
>
> 73
> Bob, K4TAX
>
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