07-12-2019, 02:50 PM
I've mostly completed the electronic restoration of my 45C. It sounds surprisingly good! And, the radio performs with very good sensitivity and selectivity. I'm fairly impressed and I think you will be as well, morzh (at least I hope so). My volume control is definitely a problem and I will be looking for a replacement. The cabinet needs a bit of TLC and I will probably refinish it sometime.
My restoration used most of the old wire except for the high voltage lines. All tubular capacitors were re-stuffed as were the electrolytics. All dog bone resistors remain in circuit with an added hidden parallel resistor for those that were way high in value. I avoided bending the PT wires and coated them with a couple of coats of clear "corona dope" acrylic plastic from GC electronics in the hope that it will add a tiny bit of insulation value. I need to find a couple of tube shields.
This radio also has the 50K resistor that morzh talked about earlier in this thread. Mine measures 35K so I added a 15K in series. This resistor drops the voltage by only about 5 volts so I'm not sure of what its purpose is. Perhaps to slightly increase field current??? Removing the 15K drops the voltage by another volt or so. I may just leave it out.
Morzh, do you still need a dial cord diagram? I could take a couple of pics. It is quite straight forward.
Here's a few of pics:
My restoration used most of the old wire except for the high voltage lines. All tubular capacitors were re-stuffed as were the electrolytics. All dog bone resistors remain in circuit with an added hidden parallel resistor for those that were way high in value. I avoided bending the PT wires and coated them with a couple of coats of clear "corona dope" acrylic plastic from GC electronics in the hope that it will add a tiny bit of insulation value. I need to find a couple of tube shields.
This radio also has the 50K resistor that morzh talked about earlier in this thread. Mine measures 35K so I added a 15K in series. This resistor drops the voltage by only about 5 volts so I'm not sure of what its purpose is. Perhaps to slightly increase field current??? Removing the 15K drops the voltage by another volt or so. I may just leave it out.
Morzh, do you still need a dial cord diagram? I could take a couple of pics. It is quite straight forward.
Here's a few of pics:
