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.
----- Original Message -----
From: "John" <firstname.lastname@example.org>
To: "Ron Castro" <email@example.com>; "Discussion of Ten-Tec Equipment"
Sent: Saturday, August 18, 2007 5:00 PM
Subject: Re: [TenTec] Titan 425 Transformer needed
> How much would a Peter Dahl Transformer be for the 425 or centurion ?
> ----- Original Message -----
> From: "Ron Castro" <firstname.lastname@example.org>
> To: "Discussion of Ten-Tec Equipment" <email@example.com>
> Sent: Saturday, August 18, 2007 3:03 PM
> Subject: Re: [TenTec] Titan 425 Transformer needed
>> The primary to secondary short is a known problem with the 425's, and
>> went back to the factory some years ago for a replacement which is still
>> running fine today.
>> You can't go wrong with a Peter Dahl transformer as a replacement, but I
>> would suggest calling them on the phone. Here is a link to an article
>> beefing up the venerable 425 which is good for future reference even if
>> keep the finals and the plate voltage the same. The author used a
>> built Peter Dahl transformer for the project which turns the 425 into 3.5
>> ground pounder!
>> Ron N6IE
>> ----- Original Message -----
>> From: "Carlin Royal" <firstname.lastname@example.org>
>> To: <email@example.com>
>> Sent: Saturday, August 18, 2007 11:49 AM
>> Subject: [TenTec] Titan 425 Transformer needed
>>> Sorry for the long delay on the re-post. After replacing/upgrading the
>>> rectifier board, installing new filter capacitors the initial problem is
>>> still there. I carried the amp to a local repair shop and it has been
>>> determined for sure the secondary leads have shorted with the primary in
>>> the transformer. SOOOO I am in need of a new transformer for the Titan
>>> 425 at this time. Since I have already come this far money wise and time
>>> wise, I think it would be best to get a "really good" transformer this
>>> time. I have emailed Peter Dahl with no response, are they still doing
>>> this sort of thing for amateur use?
>>> _"I have a Ten Tec Titan 425 that I have only had myself for about 6
>>> months now.
>>> The amp when I received it had 1 bad HV capacitor in the power supply.
>>> lack of funds at the time I replaced the one known bad capacitor. A few
>>> later I was operating the amplifier during a cw pileup for about 30
>>> minutes, I
>>> set everything on standby and went to lunch. When I returned to the
>>> find the amp had blown one of the 20amp fuses in the supply.
>>> After checking in the PS, I found that R1 the 10ohm 25watt wire wound
>>> on the rectifier board had went open. I replaced the blown resistor and
>>> the amp back up, this time again blowing a 20ampfuse and the same
>>> resistor. Ten
>>> Tec advised to replace the original rectifer board with a new one,
>>> rev E
>>> I beleive) since they thought some diodes were probably leaking and was
>>> cause of all my troubles. Now after replacing the old rectifier board
>>> new one from Ten TEc, I power the amp on and it blows another 20amp fuse
>>> did not appear to fry the resistor this time. Here is the main question
>>> list; Could I have another bad capacitor that is failing under high
>>> since they do not read any shorts on the VOM when individually beng
>>> tested. I
>>> have on order 8 new 400uf 450v caps from Newark Electronics and will be
>>> replacing them this week, but I am looking for more input as to the
>>> trouble. It
>>> just seems odd to me that when sitting idle for just 3
>>> 0 minutes the thing went south and now I have had all this trouble.
>>> I am on the right track and it will be one of the caps in the PS, but
>>> would be
>>> interested to hear any other areas that I might could check within
>>> on the very limited bench. Thanks for any advise/comments.
>>> 73 "_
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