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Puzzled Over 118MX
Chuck Schwark
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Posts: 1,703
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City: Evanston, IL
#3

01-22-2014, 04:22 PM
All all the resistors replaced? Even if the old one(s) checked ok, after heating up a bit, carbon comp. resistors can change value, especially the old types. How about that three-section resistor #61? Looks like higher wattage types there.

Could be a bad/cold solder joint anywhere - tube sockets, term strips, lugs on parts. Maybe a notorious Philco coil going open in RF section causing low gain on front end.

You need to make a chart of the tube pin voltages when it's mis-behaving to compare with "working good" condition. That will point you to the troubled area.

Chuck
Chuck Schwark,
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Messages In This Thread
Puzzled Over 118MX - by Jamie - 01-22-2014, 04:05 PM
RE: Puzzled Over 118MX - by Mondial - 01-22-2014, 04:19 PM
RE: Puzzled Over 118MX - by Chuck Schwark - 01-22-2014, 04:22 PM
RE: Puzzled Over 118MX - by Jamie - 01-22-2014, 05:22 PM
RE: Puzzled Over 118MX - by jontz - 01-22-2014, 05:30 PM
RE: Puzzled Over 118MX - by morzh - 01-22-2014, 05:53 PM
RE: Puzzled Over 118MX - by Radioroslyn - 01-22-2014, 07:46 PM
RE: Puzzled Over 118MX - by Chuck Schwark - 01-22-2014, 11:53 PM
RE: Puzzled Over 118MX - by Arran - 01-23-2014, 01:21 AM
RE: Puzzled Over 118MX - by BrendaAnnD - 01-23-2014, 02:04 AM
RE: Puzzled Over 118MX - by TV MAN - 01-23-2014, 10:15 AM
RE: Puzzled Over 118MX - by BrendaAnnD - 01-23-2014, 11:27 AM
RE: Puzzled Over 118MX - by Jamie - 01-23-2014, 01:00 PM
RE: Puzzled Over 118MX - by morzh - 01-23-2014, 01:40 PM
RE: Puzzled Over 118MX - by tab10672 - 01-23-2014, 02:37 PM



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  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration