Posts: 811
Threads: 43
Joined: Dec 2008
City: Chicago, IL
That coil was open in both chassis. Same old issue. primary wound over a celluloid insulator that had hardened and warped.
Luckily, the break was easy to find and repair. I did not need to rewind 
[Image: https://live.staticflickr.com/65535/5163...6f90_c.jpg]
Yep, that fixed it. It must have been barely hanging on and would open up when it got warm.
Posts: 1,842
Threads: 118
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello Bob,
That is great news now the radio should work fairly well !
Sincerely Richard
Posts: 811
Threads: 43
Joined: Dec 2008
City: Chicago, IL
I performed a minor surgery on the Philco 20 PP speaker I have so that the field coil is connected to one end of the OT primary rather than the center tap.
[Image: https://live.staticflickr.com/65535/5164...3df9_c.jpg]
Viola - it works. Sounds a little hollow and dull, but it works fine. I'll use it for now until I can get the 90 speaker field coil repaired.
[Image: https://live.staticflickr.com/65535/5163...032d_c.jpg]
(This post was last modified: 10-29-2021, 05:03 PM by Bob Andersen.)
Posts: 16,489
Threads: 573
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Unless I missed it - does the field coil work now?
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.
Posts: 811
Threads: 43
Joined: Dec 2008
City: Chicago, IL
I have two speakers. A single ended one for a Philco 90 with an open field coil and missing output transformer.
The one shown above is for a Philco 20 with push-pull 71A driving it. I disconnected the center tap and tied one end of the output transformer to one side of the field coil to make it compatible with my 90.
Posts: 1,842
Threads: 118
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello Bob,
good thinking far as the speaker goes !
sincerely Richard
Posts: 4,869
Threads: 54
Joined: Sep 2008
City: Sandwick, BC, CA
I found a cheaper source of magnet wire, can't vouch for the seller of course: https://www.ebay.com/itm/363090262105
Regards
Arran
Posts: 811
Threads: 43
Joined: Dec 2008
City: Chicago, IL
Thanks for the tip. I just placed an order.
I'll try the techniques described in this thread to get the pole piece out and back in.
https://philcoradio.com/phorum/showthread.php?tid=15792
(This post was last modified: 11-03-2021, 01:12 AM by Bob Andersen.)
Posts: 811
Threads: 43
Joined: Dec 2008
City: Chicago, IL
Hey, finally found a currently made audio taper 500K pot with a 2" round shaft. 2W rating.
Not exactly cheap at $17.76, but at least there's an option from a decent brand. Shaft can be cut or filed down as needed.
https://www.mouser.com/ProductDetail/CTS...364R504A21
Also available from Digi-Key for a bit more.
https://www.digikey.com/en/products/deta...1/11617375
(This post was last modified: 11-03-2021, 10:35 PM by Bob Andersen.)
Posts: 1,842
Threads: 118
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello bob,
man I wish you were not in a hurry because when i visit my family in dec. i could check my NOS stock of controls .
sincerely Richard
Posts: 811
Threads: 43
Joined: Dec 2008
City: Chicago, IL
Oh, I'm not in any particular hurry. I might very well have one in my stash too. I've seen many radios with a replacement volume control of the wrong value or taper type. It's nice to have options.
Posts: 811
Threads: 43
Joined: Dec 2008
City: Chicago, IL
Magnet wire arrived today. Looks like the real deal. We'll soon find out how well it works.
[Image: https://live.staticflickr.com/65535/5165...512d_c.jpg]
Posts: 1,842
Threads: 118
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello Bob,
that is great news I do have some but I don't think that gauge thou.
I have a new project to rebuild a huge RCA like 10 tube count chassis with the magic brain .
Sincerely Rich
Posts: 285
Threads: 27
Joined: Nov 2012
City: Tehachapi. California
I wish I had a magic brain. Mine is always thinking the wrong thing.
!!!!!!!!!!!!!!!!!!!RESISTANCE IS FUTILE!!!!!!!!!!!!!!!!!!!!!!
/\/\/\/\/\/\/\/\/\
[Image: http://philcoradio.com/phorum/images/smi...on_eek.gif] Chris
Posts: 811
Threads: 43
Joined: Dec 2008
City: Chicago, IL
The new volume control has arrived and works very well. Perfect fit too.
It's just temporarily wired in here as I still need to cut the shaft down.
[Image: https://live.staticflickr.com/65535/5166...9f2f_c.jpg]
I also installed the new arch support. Before gluing I painted with this very flat camo paint. It's a great match for the old dark interior wood.
[Image: https://live.staticflickr.com/65535/5166...c0c1_c.jpg]
The arch is far stronger now and that's a big load off my mind.
Sorry about the blurry photo. Bad lighting in the basement.
[Image: https://live.staticflickr.com/65535/5166...ef6f_c.jpg]
(This post was last modified: 11-10-2021, 02:22 AM by Bob Andersen.)
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
48-482 rear panel help
|
| Hi Kettlechip and welcom to the Phorum.
The back panel question is interesting. I have quite a few radios that use pow...MrFixr55 — 08:24 AM |
|
Philco 46-480 Electronic Restoration
|
| Not too much at all! :lol: Sounds like you’re just dabbling into the hobby!jrblasde — 07:56 AM |
|
Philco 46-480 Electronic Restoration
|
| Hi Joseph,
Fortunately, Ms. Fixr does not read my computer, or she would warn you against coming to me for sanity ch...MrFixr55 — 07:27 AM |
|
48-482 rear panel help
|
| There's a picture of one of the plastic covers in the following thread:
I bought a full set of them in 2012 or so fro...klondike98 — 11:15 PM |
|
Philco 46-480 Electronic Restoration
|
| Good sanity check! You are correct—the first (as in, the most counterclockwise) position is for the push button presets....jrblasde — 11:05 PM |
|
Philco 46-480 Electronic Restoration
|
| Hi Joseph,
First, verify that your band selector is in the correct position for what you want to do. I believe tha...MrFixr55 — 10:59 PM |
|
Philco 46-480 Electronic Restoration
|
| Got my replacement signal generator in the mail today! I was able to finish alignment of the IF section. I’ve got some t...jrblasde — 09:58 PM |
|
The list of my radio & TV collection!
|
| EdHolland. Glad you liked it. Thanks for the supportRadioSvit — 05:24 PM |
|
The list of my radio & TV collection!
|
| Great stuff, Peter thank you for posting.EdHolland — 04:06 PM |
|
My Philco 37-116 Restore
|
| The crack goes from almost the bottom of the tube to well past the fat part. It is an ST type tube. The filament is open...dconant — 10:04 AM |
|
Who's Online
|
There are currently 353 online users. [Complete List]
» 2 Member(s) | 351 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
