Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

First attempt at rewinding an oscillator coil (Phil 38-12)
#13

TESTS ATTEMPTED TODAY (MAY 11)

Several of you have suggested these different tests on this non-working Philco radio to see if osc. coil is working. Here is what I tried today and the results;

#1 Set Philco at roughly 1000 kHz and tune a good radio 455 (470 since it is IF on this one) above and below the frequency on Philco. If you hear the squal osc is working.
Results; With Philco set @ 1000, I get a squawl/squeal on good radio at about 1200 kHz and about 610-620 kHz. Not loud but I hear it. I hear no broadcast anywhere.

#2 Set good radio to a clear spot about 1200 kHz and tune the Philco up and down the dial. Faint whistle indicates the radio's osc is working.
Results; I hear nothing today and I hear no broadcast anywhere.

#3 Set Philco @ 550 kHz and place ant wire near 6A7 tube and it should be heard at 1020 kHz.
Results; I hear nothing & I hear no broadcast anywhere.

Other anecdotal notes. A faint station on the good radio gets noticably stronger when I connect ext. antenna to Philco (this was @ about 1300 kHz.) I also hear the static noise on good radio when I connect the Philco ext. antenna.

When I touch ext antenna wire to Philco 6A7 grid cap, I hear static in the Philco speaker and also in the good radio.

Is it possible I rewound the osc coil the wrong direction? Should I try unsoldering the wires and reverse them---#1 post to #2 post and vice versa? Starting to get a little frustrated to say the least.

Thanks for all your good help.
Art


Messages In This Thread
Re: First attempt at rewinding an oscillator coil (Phil 38-1 - by Art Hoch - 05-11-2011, 05:34 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 42-345 Restoration/Repair
Yes, 57 is an electrolytic cap that should be 12 mfd 400 volts according to the parts list from the Phorum library schem...RodB — 06:01 PM
Philco 42-345 Restoration/Repair
Looks like if I am reading it correctly it looks like the silver capacitor#57 that appears to be a replacement is of a l...osanders0311 — 05:09 PM
Philco model 38 code 121 not receiving signal.
Thanks Arran. Yeah this plastic is pretty thin. It's a little thinner than the original stuff. It kinda reminds me of p...Stormlord5500 — 04:37 PM
Testing a speaker and output transformer Trutone A2-G
The equivalent of one short turn is basically the same as that of a shorted load. If it is the primary's turn, then the ...morzh — 03:53 PM
Testing a speaker and output transformer Trutone A2-G
I've never had an output transformer become shorted, the failure mode is usually an open primary, or in a center tapped ...Arran — 03:52 PM
Philco model 38 code 121 not receiving signal.
As long as the plastic sheeting isn't too thick, I think that the thickness of photographic film would be just about rig...Arran — 03:19 PM
Philco model 38 code 121 not receiving signal.
Well why not! :lol:Stormlord5500 — 03:14 PM
Philco model 38 code 121 not receiving signal.
Good luck next thing you know you will be winding coils just for the fun of it. DavidDavid — 11:29 AM
Testing a speaker and output transformer Trutone A2-G
morzh Short-circuited turns can be considered as a half-dead transformer. But on this case transformer will hot and s...Vlad95 — 11:01 AM
Testing a speaker and output transformer Trutone A2-G
I am not sure how a transformer could be weak. It could be inadequate, but only when you replace the original with somet...morzh — 09:56 AM

[-]
Who's Online
There are currently 2180 online users. [Complete List]
» 1 Member(s) | 2179 Guest(s)
Avatar

>