Re: [TenTec] Titan 425E caps for sale !!!

[Bill NY9H <ny9h@arrl.net>]

pete is right on the money....   i managed to go with your first thought...
and replaced the caps....  total waste....

then i got a 6kv fluke probe for my fluke...  figuring the setup would
know the difference between the 1700 at high setting
i was / and am still reading. and the proper 2300.   it's the metering circuit.

I also have left it alone till I need to pull the amp, for a good reason.

Soo if anyone really wants a good deal on a set used caps, but work just as 
good as the new ones I put in....I'll be glad to deal.

get a good probe... and save a bunch of $$...be careful...

bill


At 04:12 PM 7/17/2004, you wrote:

> Hi Marcel:  My 425 also indicates 1.8 "Plate Kilovolts" on the front panel 
> meter. I was suspicious when that started, about five years ago, since the 
> drive wattage and Tune/Load settings remained the same for the same power 
> output so I checked the actual HV out of the power supply.
> CAREFULLY!!!
> My power supply itself puts out 2,320 Volts when the plate meter sits on 
> the dot between the numbers 1 and 8 in the 1.8 red scale. Running CW with 
> 1500 W measured output the actual voltage drops to 2,230 V - while the 
> meter on the Titan drops to just a bit to the left of the 1 in 1.8. I 
> suspect a dropping resistor in the metering circuit, but I haven't been 
> curious enough to tear my setup down to get to the circuitry. Too much 
> work for too small a concern.
> Now, I was suspicious for three reasons. Besides the fact that my logged 
> settings for max output had not changed,  local hams who can hear me very 
> well and know my voice report NO AC HUM on my signal with or without the 
> amplifier in line. And the final reason is that when the filter caps go 
> bad there's usually  a very substantial drop in voltage between no load 
> and full load.
> If you don't show a big drop in HV between idling and operating I would 
> not worry too much about it. If it worries you find a calibrated high 
> voltage meter or a probe that will work with a meter you have and measure 
> the HV at the power cable at the back of the RF deck. And have everything 
> hooked up and metering - AND YOUR HANDS WELL CLEAR - before you turn the 
> power on!  Failure to do this can result in a well done ham!!!!
> If the HV meter agrees with the built in meter, you may have a power 
> supply problem worth fixing. If it reads much higher than the built in 
> meter you probably have a voltage divider problem in the Titan's metering 
> circuit.
> 73  Pete Allen  AC5E
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