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Model 60 Code 121
#9

Greg, did you check here?

http://www.philcoradio.com/tech/60evol.htm

Ron has just about all the variations of the 60 schematics. I believe you have the later version if the 6A7 and 78 have individual cathode resistors instead of the earlier single combined resistor.

Voltage readings should be similar on all models. I would expect about 250 v on the plates with 90 to 110 on the screens of the 6A7 and 78.

Do you notice a big difference in AVC voltage on each side on the 2 meg AVC filter resistor? There may be something loading down the line on the side connected to the coils and tube grids. With a 2 meg series resistor it doesn't take much to pull the voltage down.


Messages In This Thread
Model 60 Code 121 - by gregb - 03-04-2014, 11:36 PM
RE: Model 60 Code 121 - by Mondial - 03-05-2014, 12:29 AM
RE: Model 60 Code 121 - by gregb - 03-05-2014, 12:41 AM
RE: Model 60 Code 121 - by Mondial - 03-05-2014, 12:55 AM
RE: Model 60 Code 121 - by gregb - 03-05-2014, 01:02 AM
RE: Model 60 Code 121 - by Mondial - 03-05-2014, 12:43 PM
RE: Model 60 Code 121 - by gregb - 03-05-2014, 08:25 PM
RE: Model 60 Code 121 - by gregb - 03-06-2014, 01:06 AM
RE: Model 60 Code 121 - by Mondial - 03-06-2014, 10:35 AM
RE: Model 60 Code 121 - by gregb - 03-06-2014, 10:58 AM
RE: Model 60 Code 121 - by gregb - 03-07-2014, 01:30 PM
RE: Model 60 Code 121 - by Mondial - 03-07-2014, 10:32 PM
RE: Model 60 Code 121 - by gregb - 03-07-2014, 10:38 PM
RE: Model 60 Code 121 - by Mondial - 03-07-2014, 11:22 PM
RE: Model 60 Code 121 - by gregb - 03-07-2014, 11:55 PM



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