Bob,
Yes.
I happen to be restoring an HX-50 at this time. I believe the rectifier
tube is a 5R4GYB. The specs can be found on an application at:
http://tdsl.duncanamps.com/ (I use it a lot); There is it specifies a
voltage drop of 63v at 250ma DC. Also PIV=3100; I Cathode is 715ma max;
IRect is 250ma; RMS input is 900-0-900v. Also see ratings chart at:
http://tdsl.duncanamps.com/pdf/5r4.pdf . The final setting of the resistor
will ultimately be determined by obtaining the proper B+.

Some one did the same thing to the unit I am restoring. So I will be doing
the above exercise too.

Were did you get the 500 volt electrolytic?

I hope this helps.

Paul P.

PS - I'd like to hear about your experiences. I am trying to get a clean
schematic. BAMA is missing significant parts of the schematic art work
around the Power supply 5R4.


wrote in message
ups.com...
Is the voltage drop across a vacume tube rectifier significantly higher
than a solid state plug in replacement? Previous owner of my HX-50
changed over to SS. I am changing out capacitors and just curious.

73
Bob
N9NEO