12-09-2011, 11:23 AM
Glenn, I believe that I figured this out late last night.
My schematic shows 46, by-pass condenser connections, on the lower left corner; however, if you search the schematic you will only find 3 caps labeled 46, when in fact there should be four capacitors labeled 46,on the schematic. One section, a 1 mfd section, is not labeled, or as in this case mislabeled, on the schematic.
I think that the schematic is wrong. The capacitor labeled 28 on the schematic is actually one part of 46 and is incorrectly labeled 28.
The capacitor labeled 29, on the schematic, is compensating cap 28 and the unlabeled 3000 mmfd, connected to the band switch, is p/n 29.
So far this is the third error that I found on this schematic and I really haven't started wiring the chassis.
Thanks Glenn.
FYI the other two errors on the schematic I'm using ( Philco service bulletin #194 ) are as follows:
1. On driver, tube 42, the plate and screen grid ( pins 2 and 3) are connected together, on the chassis but this does not show up on the schematic.
2. The screen grids (pins 3), of the RF and IF amps, tubes 78, are floating and not connected to the grid supply, composed of p/n 67, 68 and of course capacitor 46.
My schematic shows 46, by-pass condenser connections, on the lower left corner; however, if you search the schematic you will only find 3 caps labeled 46, when in fact there should be four capacitors labeled 46,on the schematic. One section, a 1 mfd section, is not labeled, or as in this case mislabeled, on the schematic.
I think that the schematic is wrong. The capacitor labeled 28 on the schematic is actually one part of 46 and is incorrectly labeled 28.
The capacitor labeled 29, on the schematic, is compensating cap 28 and the unlabeled 3000 mmfd, connected to the band switch, is p/n 29.
So far this is the third error that I found on this schematic and I really haven't started wiring the chassis.
Thanks Glenn.
FYI the other two errors on the schematic I'm using ( Philco service bulletin #194 ) are as follows:
1. On driver, tube 42, the plate and screen grid ( pins 2 and 3) are connected together, on the chassis but this does not show up on the schematic.
2. The screen grids (pins 3), of the RF and IF amps, tubes 78, are floating and not connected to the grid supply, composed of p/n 67, 68 and of course capacitor 46.
