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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