Thanks for the reply. Your suggestion about the HV caps has already been
followed. The L-4B was in storage from 1990-2005, so before I put it back in
service, I replaced the original Eimac finals with Chinese graphite anode
3-500ZGs and replaced the HV diode and cap strings. Like you, I didn't want
to have an aging cap blow.

I followed the recommendation in my Orion manual and use an Amitron ARB-704
switching box to interface between the amp key output of my Orion
transceiver and the VOX relay input of the L-4B.

John, N9JG

"Rick" wrote in message
...
John,
The tubes are rated at a total of 1000 watts dissipation, so I'd say if
your
input is 2kw and output is 1 kw you are ok.
The power supply might get a bit warm but I seriously doubt that it would
fail
under these conditions. I hear that the electrolytics fail often in L4Bs
at
about that age, so the heat in the PS might not be good for aging caps, so
now
might be a good time to change them.
If you are ragchewing you could back the power down or maybe use the low
voltage setting, but for contesting you probably want all the power and
dbs
you can get.
By the way, I have one here also and I need to get in there and change my
caps
too. I recently added a transistor swiching circuit for the antenna relay
to
make my transceiver happier.

Rick K2XT