Sounds like you have it backwards, there should be 3 windings in the secondary. Two yellow for the 80 filament (5volts), Two red for high voltage supply, and two green for the tube filaments..They may be center tapped with striped wires.
You should have two black wires for primary,,one is bound to be connected to the 120 volt switch.
from here, i would be wary of that transformer!..
if you have marks near the 80, I would suspect a severe short somewhere just downstream of the DC side although it could be in any number of places..
Most likely Filter cap failure...#1...
Hopefully it didnt damage the transformer and the 80 took all the damage..
If it checks out by ohming it, you might try it with no load first..remove the 80 and the rest of the tubes.
You might want to fuse it as well.
Like Norm said, you will never forget the smell of burning transformer..
: Sounds like you have it backwards, there should be 3 windings in the secondary. Two yellow for the 80 filament (5volts), Two red for high voltage supply, and two green for the tube filaments..They may be center tapped with striped wires.
: You should have two black wires for primary,,one is bound to be connected to the 120 volt switch.
: from here, i would be wary of that transformer!..
: if you have marks near the 80, I would suspect a severe short somewhere just downstream of the DC side although it could be in any number of places..
: Most likely Filter cap failure...#1...
: Hopefully it didnt damage the transformer and the 80 took all the damage..
: If it checks out by ohming it, you might try it with no load first..remove the 80 and the rest of the tubes.
: You might want to fuse it as well.
: Like Norm said, you will never forget the smell of burning transformer..
Thanks Dave!! Your right I described the thing backwards. I got the schematic from the library then
removed the transformer. The primary must be open as it ohms out at 50meg. The schematic shows #1-2
white primary @ 120v, #3-4 filament for #80 rectifier @5v, #5-7 plates of #80 @ 680v, #8-10 filaments
@6.3v, #6 center of #5-7, and #9 center of #8-10. Where can I get such a transformer and why 680v
that seems an awful lot.
: : Sounds like you have it backwards, there should be 3 windings in the secondary. Two yellow for the 80 filament (5volts), Two red for high voltage supply, and two green for the tube filaments..They may be center tapped with striped wires.
: : You should have two black wires for primary,,one is bound to be connected to the 120 volt switch.
: : from here, i would be wary of that transformer!..
: : if you have marks near the 80, I would suspect a severe short somewhere just downstream of the DC side although it could be in any number of places..
: : Most likely Filter cap failure...#1...
: : Hopefully it didnt damage the transformer and the 80 took all the damage..
: : If it checks out by ohming it, you might try it with no load first..remove the 80 and the rest of the tubes.
: : You might want to fuse it as well.
: : Like Norm said, you will never forget the smell of burning transformer..
: Thanks Dave!! Your right I described the thing backwards. I got the schematic from the library then
: removed the transformer. The primary must be open as it ohms out at 50meg. The schematic shows #1-2
: white primary @ 120v, #3-4 filament for #80 rectifier @5v, #5-7 plates of #80 @ 680v, #8-10 filaments
: @6.3v, #6 center of #5-7, and #9 center of #8-10. Where can I get such a transformer and why 680v
: that seems an awful lot.
I'm not familiar with that radio, but it sounds like a 350-0-350 volt (700 center tapped)..
Yes a meg reading is open..should be a couple hundred ohms if that..
www.tubesandmore.com has them..you may want to take dimensions and note vertical or horizontal..
getting transformers to fit can be a pain..
AES also has used 80's on sale this month for $7.25
sounds like what happened was the filter cap(s) shorted and it sat long enough for the load to melt the windings.
good luck!