The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

Q51 collector voltage only .9 volts on AM TX, should be around 4 volts. SSB TX voltage is 13 volts which is correct according to info I have here. Replaced Q51 with same results. This is as far as I have gotten. One more thing, I was talking on my Mark III set up with 200 watt tube box and switched ...

Only battery in there is the memory battery, it tested fine and is working.

Replaced the Q38 but still have the same condition.

I will check this and repot back. Is this a type of switching transistor?? Gotta get my schematic out here and find it.

Repalced driver and new outputs, all is working well. Thanks for the kind help, great forum!

I have an older version RCI 2970 that I just turned on and it is stuck in the TX mode. The amp board is working fine with full output, and whith the amp board power disconnected the problem still exists. Checked the mic jack as well, seems to be fine. Anyone seen this problem before and can help?? O...

Well, got around to replacing the finals, not the problem. It appears my driver bias is very high according to the TX alignment manual, and wont adjust down to the 50-60 mA range. Would you suspect the driver in this case? Thanks!

Thanks Rick for the reply. I will check the current on the finals and go from there. I am new here and have found some great info, much appreciated!

I have a problem with my old version 2950. Low power output on TX, about 4 watts AM/12 watts SSB. Just happend a couple days ago. Power is down about half of what it was. Voltages around outputs/driver normal, pass transistor voltages seem normal as well according to charts I have here. Before I go ...