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Philco model 18 (code 121) - HELP!

Ok, supposing you’re right and it’s an open coil (although I re-wired the antenna coil item #3 on schematic but maybe something came loose) While I’m checking, I might as well check all 3 coils, can you please take a look at the schematic and verify my plan to check them? I’m not the best at doing this when it involves several connections at one point.

• To check the #3 The Antenna transformer, can I check the resistance using one lead on the G1 of the #78 R.F. Tube and the other lead on near end of the #4 resistor (70 K resistor)?
• To check the #10 The Detector transformer, can I check the resistance using one lead on the grid-cap G4 of the 6A7 Tube and the other lead on the left end of the #13 resistor (2 Meg resistor)?
• To check the #16 The Oscillator transformer, can I check the resistance using one lead on the grid-cap G1 of the 6A7 Tube and the other lead on the right end of the #14 resistor (50 K resistor) or the left side of the #19 Cap (.0001)? This one looks more difficult to read because the circuit comes back into the 6A7 Tube in both paths.

Anyways, if the above examples work for checking the “primaries” of these coils, I think I can use the same logic to test the “secondary’s” too.
Thanks.


Messages In This Thread
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-07-2013, 10:22 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-08-2013, 10:32 PM
RE: Philco model 18 (code 121) - HELP! - by Arran - 02-08-2013, 10:49 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-09-2013, 02:21 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-09-2013, 05:57 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-09-2013, 06:12 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-13-2013, 08:40 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-21-2013, 05:25 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-28-2013, 06:04 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 03-07-2013, 04:16 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 03-07-2013, 11:20 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 04-17-2013, 01:25 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 04-18-2013, 08:48 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 04-18-2013, 09:49 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 04-29-2013, 10:02 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 06-12-2013, 01:37 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 06-13-2013, 08:33 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 07-23-2013, 10:33 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 07-24-2013, 11:11 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 08-02-2013, 05:06 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 08-21-2013, 10:26 AM
RE: Philco model 18 (code 121) - HELP! - by morzh - 12-17-2013, 10:58 AM
RE: Philco model 18 (code 121) - HELP! - by morzh - 12-19-2013, 12:47 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 12-19-2013, 08:48 PM
RE: Philco model 18 (code 121) - HELP! - by Pithicus999 - 01-03-2014, 02:11 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 01-17-2014, 04:05 PM



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