[Boatanchors] Update on my Heath Warrior HA-10 amplifier design changes (was "Please review & comment...")

[Rick Poole WA1RKT]

Things seem to be coming along well, so far, on my Warrior HA-10 rebuild project discussed in previous discussions on this reflector.  All of the changes have been made per www.rkt-tech.com/warrior including directly grounding the grids, except that the bias, grid metering, and HV metering circuits have been changed somewhat from what is shown.

Today I applied power for the first time, bringing it up slowly on a variac and keeping track of various voltage points and heat-generating components, and as mentioned, so far so good.

The 866A rectifiers were replaced with two strings of 10 1N5408 diodes with a 0.01-uf cap across each diode.  Per advice received here and elsewhere, it seems that choke-input filters can produce back-emf spikes that are high enough so that what might seem like massive overkill (10-kv diode string for a 1700-VDC supply) is really needed.

That raises an interesting question... If back-emf spikes make 10-kv diode strings adviseable, how is it that the curcuit design gets away with only a 2-kv filter capacitor (the original-equipment 8-uf 2-kv oil-filled cap)?

Rick WA1RKT 
Londonderry, NH 
Catch me on 14.300 MHz Intercon / MMSN most days