03-14-2024, 06:43 PM
I believe this radio has a 1st IF issue, the primary is 66 ohms the schematic shows 34 ohms, the secondary is 71 ohms and the schematic shows 47 ohms. It looks different than the 2nd IF from below, I think the 1st IF was replaced with one of the wrong resistance. I sent 460 KHz tone from the tone generator, on the grid cap of the 6A7, it is very faint at the secondary of the 1st IF and strong into the primary.
The 2nd IF measures 36 ohms on the primary, schematic shows 34 ohms, the secondary reads 45 ohms the schematic shows 85 ohms which I hope is an error on the schematic, 85 ohms seems a bit high.
When the 460 tone is put on the secondary of the 1st IF, I can get the tone all the way to the output coil.
I hoping I can find the correct IF coils. I think the 2nd IF is probably okay and the original one.
On the 1st IF there is no short between the primary and the secondary. This radio has two compensators on the 2nd IF, I believe this is run #11 according to the Evolution of Philco Model 60 by Ron.
Thanks
Jim
The 2nd IF measures 36 ohms on the primary, schematic shows 34 ohms, the secondary reads 45 ohms the schematic shows 85 ohms which I hope is an error on the schematic, 85 ohms seems a bit high.
When the 460 tone is put on the secondary of the 1st IF, I can get the tone all the way to the output coil.
I hoping I can find the correct IF coils. I think the 2nd IF is probably okay and the original one.
On the 1st IF there is no short between the primary and the secondary. This radio has two compensators on the 2nd IF, I believe this is run #11 according to the Evolution of Philco Model 60 by Ron.
Thanks
Jim
Jim
Spring Lake MI
