03-16-2015, 07:04 AM
Oh NO not another portable!!!!
Just got though working on one very similar to this set Darn thing was making nutz!
Anyway on the back of the chassis you'll see a little slot where you plug in the ac line
cord for battery operation. Under the chassis behind the slot there is a big switch.
Use deoxit on it and plug in the plug in the slot several times.
On all of these AC/DC/Battery set( known as 3 way portables) the power supply
voltage are very critical. How it work is a small part of the HV from the rectifier tube
lights filaments in all of the other tubes. That filament buss needs to be at 9v or
slightly better. If not all kinds of stupid stuff happens. Not bad stuff but you'll be
chasing your tail trying to figure what the heck is wrong.
Check voltage at pin 8 of the 117Z6 (red lead) to B- black lead (where all of
the - side of the Ecaps go)
Should have 95 to 100vdc+ there.
Did you replace large capacitance low voltage Ecap that is in #47? Looks like 200mfd@25v.
That is the filter for the filament string. Also check #49 and 51 they are the voltage
divider for the filaments.
Replace the rest of caps.
Terry
ps the loctal tubes in this set will have a very dim glow and won't get hot at all.
Just got though working on one very similar to this set Darn thing was making nutz!
Anyway on the back of the chassis you'll see a little slot where you plug in the ac line
cord for battery operation. Under the chassis behind the slot there is a big switch.
Use deoxit on it and plug in the plug in the slot several times.
On all of these AC/DC/Battery set( known as 3 way portables) the power supply
voltage are very critical. How it work is a small part of the HV from the rectifier tube
lights filaments in all of the other tubes. That filament buss needs to be at 9v or
slightly better. If not all kinds of stupid stuff happens. Not bad stuff but you'll be
chasing your tail trying to figure what the heck is wrong.
Check voltage at pin 8 of the 117Z6 (red lead) to B- black lead (where all of
the - side of the Ecaps go)
Should have 95 to 100vdc+ there.
Did you replace large capacitance low voltage Ecap that is in #47? Looks like 200mfd@25v.
That is the filter for the filament string. Also check #49 and 51 they are the voltage
divider for the filaments.
Replace the rest of caps.
Terry
ps the loctal tubes in this set will have a very dim glow and won't get hot at all.
