I tested unit with a multimeter it is shows 3.586V for the A side 136.4V for the B side. What is causing the unit to have these high output voltages? I understand that I can replace the rectifiers with diodes. What type of diodes would work and in what manner should they be installed?
Your power shifter doesn't have regulation. With no load voltage will be high. Once connected to a radio voltage will drop.
You could test the unit using resistors for a load. For a 250 ma load @ 1.5 volts you can use 6 ohms across the "A" supply. Might try 5K wire wound across the "B" supply. This will give a load around 20 ma.
Norm
:My Silvertone Powr Shiftr (chassis 139.151) calls for two 40 MFD 150V input capacitors and two 1500 MFD 3V filter capacitors. I have replaced them with two 47 uF 160V and two 1500 uF 10v electrolytic capacitors respectively. It has original rectifiers.
:
:I tested unit with a multimeter it is shows 3.586V for the A side 136.4V for the B side. What is causing the unit to have these high output voltages? I understand that I can replace the rectifiers with diodes. What type of diodes would work and in what manner should they be installed?
Thomas,
I have the same power shifter that came with a 4-tube RCA Victor battery set (RC1037A). The voltages with the radio not plugged into it are FIL. 3.75 VDC and B+ 131.7 VDC. With the radio plugged into it the voltages are FIL. 1.23V HI/1.025 LO and B+ 85 volts. My unit has the original rectifiers and new caps.
Radiodoc