Okay, if I understand the situation correctly, when you place the amp
in "operate" (as opposed to "standby") and key it into transmit, you
see ~175 ma Ip with no drive.
Normally with pair Chinese 3-500zg you should be seeing around 130 ma
on the front panel plate current meter with that amp, which annoyingly
has 200 ma increments with hash marks dividing each increment into
thirds making it hard to read directly. On mine at least, idle plate
current no drive is around 130 ma.
If I have the picture right so far, I'd pull out the bias board and
take a look at it. As a last resort, I'd find out if it is possible
to purchase a bias board from them and replace the whole thing before
going to the trouble of shipping the whole amp to Ten Tec. It will
probably cost you 50 bucks just to ship the amp. I think it is always
better to haul an amp on to a bench, drill and blast, and learn about
it, instead of running it off to a shop for a repair every time. On
these amps like the Centurion that has 8 or 9 PC board mounted
electrolytic filter caps, I don't know how you short each one to
ground with a screwdriver, and in fact, I think that's not a good way
to treat such a cap. I'd simply give the bleeder resistors plenty of
time to discharge the caps. Even with the big oil caps I use a
shorting stick with 10 ohms in series with the strap to ground.
73
rob
K5UJ
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