[Elecraft] KPA500 ALC Voltage

[Lyn]

Hello all,

My backup KPA500 has an issue with the ALC connection. As soon as I apply power to the amp, the ALC voltage on the connector goes to -5.2vdc. It is a “hard” problem, not effected by any tapping or poking around that I have done so far. It takes about 3 seconds for the voltage to decay when I turn off the power at the back panel.

My other KPA500 has zero volts on the ALC until I transmit and then the voltage varies, as it should. This ALC on the “problem” amp worked fine with a Kenwood rig (with 0 to -7vdc ALC range), but wouldn’t let an Icom rig transmit at all (Icom has a 0 to -4vdc range).

I don’t use ALC very often, but would like to have it working when I want it. Any ideas?

Thanks,
Lyn - KC8I