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model 18 no reception
#1

Hello all.   New to this phorum but have read as a guest for quite a while.  I've been working on a model 18 for about a month now.  Replaced all caps and ecaps, all resistors that were out of spec, rewound the small coils on the outside of the oscillator and detector coils.  I think you call them tickler coils. Found a broken wire on the inside of the antenna coil- tore it apart and spliced it.  Good continuity afterwards.  Checked all tubes - all ok.  Ohmed out all transformers and coils- all good except the 2 coils I rewound are about 2X the ohms on the schematic( the detector primary is supposed to be 3.7-is now 6ohm and the osc. pri. is supposed to be 3.4- is now 6 ohms).  Powered it up with variac and all seemed to go OK but got very little reception and nothing above 1100khz.  So I used SG and got good tone in every stage.  Thought I should do an alignment so following the instructions on the Philco  schematics from Radio Museum I set the SG on ant. term. and grd. on grd. term.  They said to put output meter on output trans. or the plates of the 2 output tubes.  I tried the 2 42 tube plates and powered everything up and blew out the 80 tube.  I have another 18 chassis that has not been tampered with except for the 2 ecap cans and the 10uf ecap can which was missing.  I made sure when I installed that cap the pos. went to grd.  I tried it again with the meter on the voice coil and could not get a sound out of it.  Put the meter on the plates and blew another 80 tube and a ecap.  Replaced both and turned on slow with variac and it stayed on.  Hooked up an antenna and 1 very weak station for 30 sec. then fades out.  Moved dial down- got another station then faded out.  Now nothing.  I'm lost now.  I know this is a long narrative but I thought you guys would need as much info as possible.  Any ideas or instruction would be greatly appreciated.  Thank You          madsowry


Messages In This Thread
model 18 no reception - by madsowry - 02-02-2018, 12:03 AM
RE: model 18 no reception - by morzh - 02-02-2018, 09:14 AM
RE: model 18 no reception - by Radioroslyn - 02-02-2018, 10:04 AM
RE: model 18 no reception - by madsowry - 02-02-2018, 04:28 PM
RE: model 18 no reception - by morzh - 02-02-2018, 11:16 PM
RE: model 18 no reception - by madsowry - 02-03-2018, 01:59 PM
RE: model 18 no reception - by madsowry - 02-03-2018, 04:30 PM
RE: model 18 no reception - by Radioroslyn - 02-03-2018, 05:52 PM
RE: model 18 no reception - by madsowry - 02-03-2018, 06:54 PM
RE: model 18 no reception - by morzh - 02-03-2018, 07:24 PM
RE: model 18 no reception - by madsowry - 02-03-2018, 07:54 PM
RE: model 18 no reception - by morzh - 02-03-2018, 08:11 PM
RE: model 18 no reception - by madsowry - 02-04-2018, 12:08 AM
RE: model 18 no reception - by morzh - 02-04-2018, 10:51 AM
RE: model 18 no reception - by madsowry - 02-04-2018, 02:08 PM
RE: model 18 no reception - by Radioroslyn - 02-04-2018, 06:17 PM
RE: model 18 no reception - by madsowry - 02-04-2018, 06:34 PM
RE: model 18 no reception - by madsowry - 02-05-2018, 02:50 PM
RE: model 18 no reception - by Radioroslyn - 02-05-2018, 03:53 PM
RE: model 18 no reception - by madsowry - 02-05-2018, 08:11 PM
RE: model 18 no reception - by madsowry - 02-06-2018, 04:51 PM
RE: model 18 no reception - by morzh - 02-06-2018, 08:38 PM
RE: model 18 no reception - by madsowry - 02-07-2018, 12:01 AM
RE: model 18 no reception - by madsowry - 02-09-2018, 06:32 PM
RE: model 18 no reception - by Radioroslyn - 02-09-2018, 08:27 PM
RE: model 18 no reception - by madsowry - 02-09-2018, 09:59 PM
RE: model 18 no reception - by Radioroslyn - 02-10-2018, 10:37 AM
RE: model 18 no reception - by madsowry - 02-12-2018, 12:07 AM
RE: model 18 no reception - by Radioroslyn - 02-12-2018, 09:15 AM
RE: model 18 no reception - by madsowry - 02-23-2018, 01:00 AM
RE: model 18 no reception - by morzh - 02-23-2018, 08:53 AM



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