Model 96 Field coil..... - Printable Version
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+--- Thread: Model 96 Field coil..... (/showthread.php?tid=12647)
Model 96 Field coil..... - Jim Koehler - 07-01-2015
Hi Guys......
On the bench is a model 96 and I'm having a few issues....
Is there a list for the resistor values? Other than part numbers and Bintliff's Philco Cap Guide Pt. II, I was just wondering if a Philco list can be found.
Can someone furnish me with the resistance value of the field coil? Mine's reading about 2,200 ohms DC. On a test, I had 334 VDC going into the FC and 150 VDC coming out. It should be about 225 VDC. Monitoring the amp draw of the radio, it's around 800 ma. I think this coil is shorted but knowing the actual resistance value would be a big help. (the cap can (p/n 3754) has been recapped and works fine.
Tnx...
...Jim
RE: Model 96 Field coil..... - morzh - 07-01-2015
Go to the sch section here at Philcoradio, open 96 sch, it has all resistors.
2,200 ohm looks right, also the values of field coils are not likely to change, it is either right value, or open, rarely short.
RE: Model 96 Field coil..... - Jim Koehler - 07-01-2015
(07-01-2015, 03:01 PM)morzh Wrote: Go to the sch section here at Philcoradio, open 96 sch, it has all resistors.
2,200 ohm looks right, also the values of field coils are not likely to change, it is either right value, or open, rarely short.
Where's the schematic section?
RE: Model 96 Field coil..... - morzh - 07-01-2015
http://philcoradio.com/tech/schema.htm
here.
RE: Model 96 Field coil..... - Radioroslyn - 07-01-2015
When I look at the diagram the output of the p/s goes into the FC then the other side of the FC goes to #45 to ground. I think what you are seeing is the voltage drop across the FC+#45. That not to say that you could have a bad filter cap or any of the bypass caps w/the resistors inside. Always use mylar cap to replace the filters
Terry
RE: Model 96 Field coil..... - morzh - 07-01-2015
Jim
1. A shorted coil would give you MORE voltage at the output, not less.
2. A shorted coil would not be 2,200 Ohms.
3. What you have is an excessive draw by the load. Have you recapped your radio? What else have you checked so far?
RE: Model 96 Field coil..... - codefox1 - 07-01-2015
Agree, if there was any intermittant in field coil to frame (which is probably ground potential,) could draw current. Check the coil out of circuit to probably prove innocent or otherwise.
RE: Model 96 Field coil..... - Ron Ramirez - 07-01-2015
The original Philco speaker field was 3,200 ohms.
RE: Model 96 Field coil..... - Radioroslyn - 07-01-2015
Don't think the spkr frame is at ground potential. Just has 4 wires for the FC and OPT. This mounted to the wood cabinet. Did you measure the FC resistance with the spkr unplugged from the chassis?
Terry
RE: Model 96 Field coil..... - Jim Koehler - 07-01-2015
Hi Guys...
Ron's number seems to prove out that the FC is shorted. I'm reading 2,200 ohms DC. Together with the open primary on the OPT, the main problem is right here. The FC can be taken out of the speaker fairly easily so I think I'll rewind it.
Anyone know of a rewinding shop on the East Coast?....or have another Model 96 speaker they can spare?
Again Tnx....
...Jim