[Hallicrafters] HT-37 power supply

[Robert Nickels]

Thinking about going to solid state rectifiers in the power supply of an 
HT-37.  I know Al Parker and others have recommended this as a way of 
minimizing the potential for transformer shorts from HV to 5 volt 
windings, but I'm also concerned about the increase in voltage that will 
result.    In fact, I did try the LV supply and ended up with over 360 
volts on the low B+ line, which messed up the relay keying tube 
operation.   Putting suitable dropping resistors in series would 
probably generate more heat than the tubes do!

I'm tempted to leave it as-is, with the 5R4/5U4 tubes, but would 
appreciate others experiences.   I just rebuilt the VFO dial shaft 
bearing  with new 3/32" balls; thanks to McMaster Carr for their 
fantastic service - placed the online order at 4:30pm and had parts in 
hand before noon the next day.  I guess it helps to live near the same 
UPS hub.

73, Bob W9RAN