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

Audio transformer two extra wires ???
#1

Found this in Model 70 last audio transformer.

The top coil had large glob of wax on one side of the top input coil and when I melted it off with dryer I found these two white extra wires coming out from the inner side of the top coil. The top coil's inner and outer go the terminals as I suspected, and the lower coil goes to one terminal and the the other to ground as it should.

Anyone have a clue? Should the be connected? They do not show on the schematic.

The ends of the these mystery wires seem to be stripped at the ends. Was this just a mishap on winding?


Attached Files Image(s)
       
#2

Why do you call it Audio transformer? It is not.

I wonder if it is the replacement of LC filter after the audio detector, they just used it as an inductance?

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
#3

My bad, Its the coil before the second detector 24 (second IF transformer- part 03092). I have no clue yet, the white wires were under the glob of wax, and when I pulled them out that's what I see.  They are very, very fine cotton covered. I wonder if this the correct coil or not. The top coil measures 7.0 mh and the bottom measures 4.0 mh.
#4

I think I was right, this is the audio detector (2nd detector) choke. It probably opened and was replaced by a coild taht was lying there nearby.

Here is the link to my Philco 90 where the recommended value is 2.5mH. They use the same exact choke in both radios with the plate detector.

https://philcoradio.com/phorum/showthread.php?tid=8106

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
#5

Good thread, thanks, my plate RF choke measures 10mh. The one in the pics that I am referring to is the second IF transformer that feeds the final audio detector. Still don't know what these are or why. Strange enough, found an eyebrow hair preserved in the wax.
#6

Send it for the DNA test Icon_lol

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.




Users browsing this thread: 6 Guest(s)
[-]
Recent Posts
Philco 49-1040
Hello Bob, You are like the home for lost tv's like how people bring pets home ! Sincerely Richardradiorich — 12:00 AM
Philco 49-1040
I thought I had an arrangement to restore this set for a customer but his wife said heck no.  Instead, he gave it to me....Bob Andersen — 10:29 PM
Philco 46-480 Electronic Restoration
I kept working on reassembly this week. I wasn’t able to solder for a few days while it was too cold (single digit low t...jrblasde — 09:27 PM
Atwater-Kent 84, restoration.
Well, powering it up would be too good to be true, and I had that feeling. Before I did, I decided to check the coils...morzh — 06:02 PM
An attempt to remove the Field Coil from a G speaker
Thanks Chas, sure will give it a look!morzh — 03:39 PM
An attempt to remove the Field Coil from a G speaker
Mike, Lookup  murrayatuptown on ARF. Seems he has a dilemma with surplus field coils. Could get lucky and have what y...Chas — 01:26 PM
Atwater-Kent 84, restoration.
Hello Mike, I have not checked to see if my console has a fuse or not and far as sets go I have early 30s General Motor...radiorich — 11:25 AM
Atwater-Kent 84, restoration.
Ron I forgot, but when you said "phone number", I remembered, caus I usually remember how I act when I need...morzh — 11:12 AM
Atwater-Kent 84, restoration.
You have an extensive collection of Philcos, Mike! I’m always excited to see each new one. Agreed on the power supply fu...jrblasde — 10:50 AM
462ron
Hi Mike, that 84 sure looks great. You don’t often see these antique radios with a fuse like yours has. I usually instal...462ron — 10:22 AM

[-]
Who's Online
There are currently 4205 online users. [Complete List]
» 1 Member(s) | 4204 Guest(s)
Avatar

>