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Re: [TenTec] Titan 425 Transformer needed

To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Titan 425 Transformer needed
From: "Chuck & Vicki Tifft" <cftifft@sbcglobal.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 18 Aug 2007 11:55:31 -0700
List-post: <mailto:tentec@contesting.com>
Go www.pwdahl.com
He lists 2 versions for the 425, one yields higher plate voltage that the 
original..$350. plus shipping for either one.
----- 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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