YOU NEED A NEW TRANSFORMER!!
73,
CLIFF - W4NJ
---- Carlin Royal <n5oe@nctwb.net> wrote:
>
> 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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