"William Mutch" wrote in message
ell.edu...
I'm curious about what is invloved in converting boatanchor
(specifically my NC-125) power supplies from tubes to solid state bridge
rectifiers. I understand that most guys will mount the bridge and
dropping resistor on a tube socket so that the conversion is easily
reversable. How do you determine the difference between (a) the
voltage drop of the tube and the solid state bridge, and (b) the working
current so that you can calculate the appropriate values of the dropping
resistor and its power rating ??
Is there any point to converting the 6.3 volt filament string from
from the ac bus, running all over the chassis spreading 60 hz hum
wherever it goes, to 6.3 volt filtered DC, a rather easy thing to do
these days. Has anyone done this ?? Is it worth it ?? what issues were
involved ?

Why would you want to use a solid state power supply in the first place.
The original power supply is not as efficient but unless you are operating
from batteries the extra 10 watts or so will never be noticed.