I want to hand out kudos to TenTec service: I sent my O II in for
service because of reduced power output and odd ALC behavior on 12 and
15 m. It took about 2 weeks for it to be repaired and sent back. Total
cost of parts was $12 and labor was $225, so it took someone about 3 h
to do the diagnosis and perform the repair. TT also replaced the RAM
battery. Shipping back to me was $87.53.
The repair lists "Replaced 21k pots in final amplifier," but I don;t yet
know anything more than this. Since I don't have a schematic for the PA,
I don't know what the 21k pots referred to do. I'll call for some
details next week, simply because I'd like to understand better what the
nature of the problem was.
Everything seems to be back to normal and, as an added bonus, TT
replaced the "rubber tires" that encircle the tuning knobs.
Now I need to finish the refurbish on the AL-1200 I scored for ~$1600. I
replaced the bleeder resistors (two were open, but both showed flaws in
the vitreous coating), all the filter capacitors (adding one to the
string), set the B+ to 4kV with the HV transformer tap, added an
internal PIN diode QSK switch and the associated keying loop, and
replaced the dial lights with LEDs. All I need now is a replacement
meter switch (on its way) and I should be cooking with a new amp.
Kim N5OP
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