10-27-2020, 01:14 PM
I have a variable power supply that was built for the Navy to service radios. It is a dual supply 0-350 and 0-150 both supplies a full floating and can be put in series or the 150 supply used as bias.
It consists of two plate transformers and two filament transformers supplying 6.3 vac and 5 volts respectively. The voltages are controlled by power stats one for each supply. There is a single dual range voltmeter and a switch to take either reading. I use it with a fused milliammeter.. In the past I have used it to completely replace the power supply in a 1949 Zenith console. That helped me to detmine that the radio was fine and that only the power supply needed restoration. The supply uses two 5R4's potato mashers though it was configured with 5U4's...
I have two mother rack mount DC supplies that are regulated, seldom used heavy old school late 40's One of which was built the Lincoln Laboratory... FWIR I have hand drawn schematics for both.
Similar power supplies can be built from old BW tv transformers, separate filament transformer and a power-stat from modified plans in a early 60's era ARRL Handbook. These are "meat and potatoes" supplies one of my favorits is a full wave supply using the 5U4 and two FWIR 6DE4 dampers giving a high and low range DC.
If you shop around for the iron and are handy with chassis one could be built for some $50.
GL
Chas
It consists of two plate transformers and two filament transformers supplying 6.3 vac and 5 volts respectively. The voltages are controlled by power stats one for each supply. There is a single dual range voltmeter and a switch to take either reading. I use it with a fused milliammeter.. In the past I have used it to completely replace the power supply in a 1949 Zenith console. That helped me to detmine that the radio was fine and that only the power supply needed restoration. The supply uses two 5R4's potato mashers though it was configured with 5U4's...
I have two mother rack mount DC supplies that are regulated, seldom used heavy old school late 40's One of which was built the Lincoln Laboratory... FWIR I have hand drawn schematics for both.
Similar power supplies can be built from old BW tv transformers, separate filament transformer and a power-stat from modified plans in a early 60's era ARRL Handbook. These are "meat and potatoes" supplies one of my favorits is a full wave supply using the 5U4 and two FWIR 6DE4 dampers giving a high and low range DC.
If you shop around for the iron and are handy with chassis one could be built for some $50.
GL
Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
