Puzzled Over 118MX

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Puzzled Over 118MX

Chuck Schwark
Phorum Expert

Posts: 1,703
Threads: 55
Joined: Sep 2005
City: Evanston, IL

01-22-2014, 05:22 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,
The Philco Repair Bench
[Image: http://www.philcorepairbench.com/images/philog3tiny.gif]
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Messages In This Thread

Puzzled Over 118MX - by Jamie - 01-22-2014, 05:05 PM

RE: Puzzled Over 118MX - by Mondial - 01-22-2014, 05:19 PM

RE: Puzzled Over 118MX - by Chuck Schwark - 01-22-2014, 05:22 PM

RE: Puzzled Over 118MX - by Jamie - 01-22-2014, 06:22 PM

RE: Puzzled Over 118MX - by jontz - 01-22-2014, 06:30 PM

RE: Puzzled Over 118MX - by morzh - 01-22-2014, 06:53 PM

RE: Puzzled Over 118MX - by Radioroslyn - 01-22-2014, 08:46 PM

RE: Puzzled Over 118MX - by Chuck Schwark - 01-23-2014, 12:53 AM

RE: Puzzled Over 118MX - by Arran - 01-23-2014, 02:21 AM

RE: Puzzled Over 118MX - by BrendaAnnD - 01-23-2014, 03:04 AM

RE: Puzzled Over 118MX - by TV MAN - 01-23-2014, 11:15 AM

RE: Puzzled Over 118MX - by BrendaAnnD - 01-23-2014, 12:27 PM

RE: Puzzled Over 118MX - by Jamie - 01-23-2014, 02:00 PM

RE: Puzzled Over 118MX - by morzh - 01-23-2014, 02:40 PM

RE: Puzzled Over 118MX - by tab10672 - 01-23-2014, 03:37 PM

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