[R-390] R-390A B+ Current?

[Roger Ruszkowski]

John,

Way to much science. These are tube radios and need no where this much
exactness. Remember these receivers were designed to run on 
generators and very sorry power sources. At power on B+ does not surge
to 1/4 amp and thus blow the B+ fuse.

Rather than drop B+ as heat in a resistor, better to run a bit more current / voltage / power in each tube
and thus spread that 3 -4 watts across all the tubes.

The idea of changing a filter cap can in the audio deck out for a series limiting transistor voltage 
regulator comes to mind as improving the B+ ripple. Some rewiring on the cap socket to
get the transistor in series would be needed.

Roger AI4NI