[Amps] 8877 Plate Voltage

[Charles Bibb]

Starting a new project.

I'm collecting parts for a new HB 8877 amp.  One really nice part 
that I've recently acquired is a massive transformer for the HV 
supply.  This transformer came out of a commercial FM transmitter 
that ran an 8877 at 1 kw continuous duty.

While that power supply used a choke-input filter in the HV supply, I 
want to run the higher voltage obtained by a cap.-input filter. With 
a cap.-input filter, however, the HV supply will be a tad over 
4150VDC, using the "best" primary taps available. Can wire for 
higher, but not any lower.

My question(s) is/are:  How critical is Eimac's "absolute maximum 
ratings" as far as plate voltage is concerned.  I know that under 
load, with acceptably regulation, the plate voltage will be about 
where I want it at 3800V.  Is the slightly-too-high potential on the 
anode under no-load a problem? Or, should I just not worry about it 
and "let 'er rip, tator chip".

Anyone have experience here?

73,
Charles - K5ZK