10-30-2025, 04:05 PM
http://pacifictv.ca/schematics/philco37-3630manual.pdf
I have a Canadian Philco 3630. I changed all the caps and all the out of range resistors and it was working. This is a three section chassis and I took it apart to access two of the caps and I ordered new chassis supports. I thought it went back together very well but now it is motorboating at a frantic pace when I turn up the volume. I am not receiving anything just dull hum from the speaker.
The voltages for the tubes are: 6F6 273 pin 3, 286 pin 4, 6K7 RF 267 pin 3, 104 pin 4, 6A8 268 pin 3, 104 pin 4, 193 pin 6, 6K7 IF 285 pin 3, 104 pin 4 and 6Q7 238 pin 3.
All the voltages are higher than on the schematic especially those going to pin 4. Where would I begin to check or replace components to reduce the voltages or are they ok as is.
The motorboating is my main concern. I am new to this hobby and have not encountered it before. I’m a little lost as to how to proceed from here and would appreciate any suggestions from the learned members of the Phorum.
I have a Canadian Philco 3630. I changed all the caps and all the out of range resistors and it was working. This is a three section chassis and I took it apart to access two of the caps and I ordered new chassis supports. I thought it went back together very well but now it is motorboating at a frantic pace when I turn up the volume. I am not receiving anything just dull hum from the speaker.
The voltages for the tubes are: 6F6 273 pin 3, 286 pin 4, 6K7 RF 267 pin 3, 104 pin 4, 6A8 268 pin 3, 104 pin 4, 193 pin 6, 6K7 IF 285 pin 3, 104 pin 4 and 6Q7 238 pin 3.
All the voltages are higher than on the schematic especially those going to pin 4. Where would I begin to check or replace components to reduce the voltages or are they ok as is.
The motorboating is my main concern. I am new to this hobby and have not encountered it before. I’m a little lost as to how to proceed from here and would appreciate any suggestions from the learned members of the Phorum.
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