How much would a Peter Dahl Transformer be for the 425 or centurion ? John
kb2huk
----- Original Message -----
From: "Ron Castro" <ronc@sonic.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.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 mine
> 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
> about
> beefing up the venerable 425 which is good for future reference even if
> you
> keep the finals and the plate voltage the same. The author used a
> specially
> built Peter Dahl transformer for the project which turns the 425 into 3.5
> kW
> ground pounder!
>
> http://www.hamradiomarket.com/articles/Titan%20P%20Hybrid.htm
>
> Ron N6IE
> www.N6IE.com
>
>
> ----- Original Message -----
> From: "Carlin Royal" <n5oe@nctwb.net>
> To: <tentec@contesting.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.
>> Due
>> to
>> lack of funds at the time I replaced the one known bad capacitor. A few
>> months
>> 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 shack
>> I
>> 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
>> resistor
>> on the rectifier board had went open. I replaced the blown resistor and
>> powered
>> 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, (82112
>> rev E
>> I beleive) since they thought some diodes were probably leaking and was
>> the
>> cause of all my troubles. Now after replacing the old rectifier board
>> with
>> the
>> new one from Ten TEc, I power the amp on and it blows another 20amp fuse
>> but
>> did not appear to fry the resistor this time. Here is the main question
>> to
>> the
>> list; Could I have another bad capacitor that is failing under high
>> voltage
>> 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.
>> Hopefully
>> 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 reason
>> here
>> on the very limited bench. Thanks for any advise/comments.
>> 73 "_
>>
>>
>>
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>>
>
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