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

nightmare
#1

The 41-90 i got for free has numerous problems but i am confident to get threw this and still have most
of my hair.The second if transformer has a open coil part number 32-3199 any ideas on how to fix this?
or what do i replace it with.
#2

I was able to repair an open IF in a compact stereo by removing the case and re-soldering the coil leads at the terminal lugs. One had broken away. If you're lucky it might be that simple.

-David
#3

I have actually thought about that but i haven't got that far. I am hoping that is all it is,it would be nice there is alot more wrong with it than i thought, for a 4 tube radio. This is my first resteration.
#4

I'd give the transformer a good looking over. Check it for the green winding disease. If it's got it you will need the replace it. Depending on the mounting I like Ktran transformers. Probably it will be smaller than the oem job. Diagram sez IF fq is 456 KC. A 455KC can will work fine.
de N3GTE
Terry

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#5

7estatdef Wrote:Probably it will be smaller than the oem job.

No "probably" about it, har-har. OP is talking about a 1941 model.

Never seen 'green winding disease' on a 40s Philco IF either. I lead a sheltered life.

I'm with David Berman. The the most common cause of an open 40s IF xfmr is at the lugs.
#6

Hope both of yous guy are right. I've got model 600 with an intermittent problem of the IF going in and out in oscillation (regeneration). Granted it's a bit older (1936) but I think the feedback winding is causing the problem. Did get it apart kind of as the rivets at the bottom of the can won't let the ceramic trimmer pass by. It doesn't have lugs just wires extending out of the top and bottom. Everything looks good inside so I was thinking about use a heat gun and an ohm meter to see if I can get it to act up. I will be sure to resolder the internal connections and hope for the best. When it's working it surprisingly well for a simple set.
Terry

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Another amp build - here I go again!
How many amps a man can have? I say, as many as the space can hold.morzh — 10:01 AM
Value of capacitor
>>>It currently has an .005 1000 volt electrolytic that is at least 40 years old. That needs to go. There i...morzh — 10:00 AM
One irritating little amp - VM 557
The VM amps were kinda weird, but as you say, they did work well until they didn't. I just got a bag full of new tube so...TV MAN — 08:56 AM
Another amp build - here I go again!
I have a pair of Mk3 Dynas and they always sounded great with plenty of punch. 6550 is the same as a KT88 except usually...TV MAN — 08:45 AM
philco predicta
As Mr. Fix says, this is a live chassis so without an isolation transformer, it can be dangerous to work on. There's goo...TV MAN — 08:33 AM
Value of capacitor
If this helps you sort it out just remember 10,000 mmfd or pf = .01 mfd. So 5,000mmfd = .005 mfd.Radioroslyn — 04:23 PM
Value of capacitor
OP here- the parts list calls for an .005 1000 volt mica. It currently has an .005 1000 volt electrolytic that is at lea...bridkarl — 02:09 PM
Value of capacitor
Maybe it's one of those paper caps that is wrapped in a mica-lookiing case.RodB — 01:51 PM
Value of capacitor
I also was wondering what the post about using polarized caps had to do with the subject? The cap is 5nF, does not exis...morzh — 10:22 AM
Value of capacitor
The OP stated that there is an electrolytic in the circuit in place of the coupling cap and wondered what effect it has....RodB — 09:53 AM

[-]
Who's Online
There are currently 2050 online users. [Complete List]
» 1 Member(s) | 2049 Guest(s)
Avatar

>