FILTER CHOKE

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FILTER CHOKE

Post by denver on Mon Mar 15, 2010 2:39 pm

Checking resistance on filter choke getting 170 ohms resistance. Took wires loose so i wouldnt get false reading.
philco model 111. Rolling Eyes Very Happy
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Re: FILTER CHOKE

Post by Resistance is Futile on Mon Mar 15, 2010 8:07 pm

So is that a correct reading?
Is the filter choke an open wound coil, or with lamination's, or totally encased?

(suggestion as an experiment--NOTE I have never done this so be cautious)
You could check to find its impedance, by using
A variable resistor in series with the choke and 6 volt AC source. Read the voltage across the choke then read the voltage across the resistor. they should be the same.

If not then adjust the Pot till both read the same.

This will tell you what the impedance is in ohms, by reading the resistor value after the test.
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filter choke

Post by denver on Mon Mar 15, 2010 8:29 pm

It is totally encased . what else would make this radio blow electrolytic cap ?
Not good enough to try your method . Resistors check good no shorts anywhere. Rolling Eyes Idea
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Re: FILTER CHOKE

Post by Resistance is Futile on Mon Mar 15, 2010 9:45 pm

caps deteriorate with time and can open or short by them selves. The other possibility is the cap was installed backwards. (wrong polarity) Suspect
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Re: FILTER CHOKE

Post by Resistance is Futile on Mon Mar 15, 2010 10:05 pm

If you look at the schematic, you will not find that value???????
It looks to be about 3200 ohms not 180 Sounds like you may have a shorted field (choke)
Click Here for Schematic on Philco 111
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Re: FILTER CHOKE

Post by denver on Tue Mar 16, 2010 12:49 pm

Thanks for your help. Found a site you might want to take a look at www.tpub.com . The one in my radio call for 200omhs resistance 20%tolarance 180 should be good .
Was new caps right polarity. Any other thoughts why it would blow. Rolling Eyes
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Re: FILTER CHOKE

Post by denver on Tue Mar 16, 2010 12:51 pm

Oh iam a big star treck fan . get your name from the borg affraid
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Re: FILTER CHOKE

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