[Collins] 516F-2 Query

[Byron Tatum]

Hello-
    I am preparing to service a pair of 516F-2 supplies, for my (newly 
aquired) KWM-2 and 32S-3. My desires are to lower the voltages on an overall 
basis and to lower the heat load on transformer and components.
    I am considering removing the tube rectifiers entirely and using diodes. I 
realize this will undesirably increase my low B+ and high B+ voltages, that are 
already too high to begin with. However, this of course gets rid of a lot of 
heat and the filament load on power transformer. 
    To bring down the voltages is it feasible to take the two 5 volt filament 
windings and use them to "buck" the primary of power transformer? I can't recall 
hearing or seeing of this done in a 516F-2 but have heard it suggested in a 
receiver power transformer once.
    I have studied the Heyboer replacement power transformer for the 516F-2 and 
really like the tapped primary which allows you to counteract the higher line 
voltages of today.
    If this is feasible I plan to use one rectifier spot for a relay to take the 
current load off of the on/off switch in radio.
    In the past I have added the dropping resistor in the low B+ to at least 
help there, but I am looking for a better overall solution to the voltage and 
heat issues.
                                                    Thanks, Byron WA5THJ