07-11-2013, 02:42 PM
How does one bypass a missing shadowmeter?
Shadowmeter ?
07-11-2013, 02:42 PM
How does one bypass a missing shadowmeter?
07-11-2013, 03:45 PM
Every circuit I've seen with a shadow meter, the meter could be bypassed safely by simply connecting the wires together.
07-11-2013, 04:57 PM
Well, that should be easy enough to do. I was thinking I had to add a resistor in place of the meter.
07-11-2013, 11:45 PM
Is the coil driving the shadow meter open on your set or is the shadow meter just not functional? I would think that there is some sort of voltage drop across the coil since it consists of hundreds of turns of wire.
Regards Arran
07-12-2013, 02:31 AM
Well, if we would listen to the OP, the meter is apparently missing. As I recall, there are two differing set ups on Philcos, one with the meter alone supplying B+ to the front end of the receiver and one where it did the same thing but with a resistor in parallel just in case the coil should open and the the front end will still get enough voltage to work. If yours is a receiver that did not have that bypass resistor, I agree with Brenda , should work just fine with a bypass wire or maybe a 1-2K resistor if the B+ looks a little high. If it had that resistor in parallel, you shouldn't need to do anything.
Again, I know nothing! ![]() Jerry A friend in need is a pest! Bill Slee ca 1970.
07-12-2013, 03:17 PM
Hundreds of turns try 4000 I just unwound one.
07-12-2013, 03:40 PM
Surprised no one has seen my Service Tips Section?
Service Tips Section: http://philcorepairbench.com/tips/svctips.htm Shadow Meter Repairs: http://philcorepairbench.com/tips/svctip01.htm Chuck Chuck Schwark, The Philco Repair Bench [Image: http://www.philcorepairbench.com/images/philog3tiny.gif] http://www.philcorepairbench.com
07-12-2013, 04:24 PM
Certainly I have used your information Chuck. It indicates that the resistance of the coil should be about 1.1K based on the number of feet of the wire and resistance per foot.
![]() Jerry A friend in need is a pest! Bill Slee ca 1970.
07-12-2013, 07:12 PM
In my 18 the shadow meter was simply shorted.
Somehow I think it does not have a huge effect on functionality.
07-12-2013, 07:19 PM
OOPS, replied to the wrong post .
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