05-23-2024, 12:02 PM
Radiola 28 AC with resistor strip attached, more info when I am back at my keyboard.
They are high rez so they can be blown up for detail.
I did not melt out this cat nor do I know if it has problems.
It appears unmolested after melt out, so things like OEM caps are still in place...
Note that two caps pass over the internal steel support beam, it they are too close they can short to the beam which is at B-. Should have had a cambric covering, may have shorted when re-filled...
There are several ways to go here.
Best option since your transformers are O.K. as well as other coil/connections. Take this cat w/resistor strip. Determine which resistor strip to "gut", soak in solvent and get an Exacto under the wires, cut them off, avoid scratching the phenolic that would weaken it. May, have to re-order the one or both of the triple tabs to satisfy the jumper connection scheme.
Use your favorite hookup wire and either drill tiny holds through the straps or surface solder all the required jumpers.
Alternative is WTB in any forum for a 28 DC catacomb or its jumper strip.
If, indeed there is a shorted cap, I, doubt, but the cat has been monkeyed with. You could use the 28 cat I have and not have to bother melting out.
I have no 28's in my collection, I don't need this cat for any future project.
BTW the 'short" could be in the criss/cross of whisker wires under the cover. See the photo...
I have seen these wires pop off their soldered connections to the brass #4 screws.
I also have a few of those long brass screws & nuts if you need some.
If you have to work with the caps, do NOT bend the exiting leaves from the body of the cap, that WILL break one or more of the leaves and decrease the effective capacitance.
I checked the audio transformers on this cat, the last audio has an open winding, that explains the melt out...
Let me know if you need this cat...
Chas
They are high rez so they can be blown up for detail.
I did not melt out this cat nor do I know if it has problems.
It appears unmolested after melt out, so things like OEM caps are still in place...
Note that two caps pass over the internal steel support beam, it they are too close they can short to the beam which is at B-. Should have had a cambric covering, may have shorted when re-filled...
There are several ways to go here.
Best option since your transformers are O.K. as well as other coil/connections. Take this cat w/resistor strip. Determine which resistor strip to "gut", soak in solvent and get an Exacto under the wires, cut them off, avoid scratching the phenolic that would weaken it. May, have to re-order the one or both of the triple tabs to satisfy the jumper connection scheme.
Use your favorite hookup wire and either drill tiny holds through the straps or surface solder all the required jumpers.
Alternative is WTB in any forum for a 28 DC catacomb or its jumper strip.
If, indeed there is a shorted cap, I, doubt, but the cat has been monkeyed with. You could use the 28 cat I have and not have to bother melting out.
I have no 28's in my collection, I don't need this cat for any future project.
BTW the 'short" could be in the criss/cross of whisker wires under the cover. See the photo...
I have seen these wires pop off their soldered connections to the brass #4 screws.
I also have a few of those long brass screws & nuts if you need some.
If you have to work with the caps, do NOT bend the exiting leaves from the body of the cap, that WILL break one or more of the leaves and decrease the effective capacitance.
I checked the audio transformers on this cat, the last audio has an open winding, that explains the melt out...
Let me know if you need this cat...
Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”