Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > Vintage TV & Radio Tech Forum

We appreciate your help

in keeping this site going.
 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #1  
Old 06-25-2014, 10:15 AM
DavGoodlin's Avatar
DavGoodlin DavGoodlin is offline
Motorola Minion
 
Join Date: Aug 2011
Location: near Strasburg PA
Posts: 3,400
Philco FM detector trans help needed

I have this 1962 Philco Stereophonic console HiFi that would play for about 10 minutes on FM until the static associated with silver mica disease begins.

After isolating stage by grounding grids of the two preceding stages, then confirming with some chopstick acupuncture at the suspect transformer's base, I carefully removed and disassembled it. The Sams schematic shows the three capacitors (without the values) within the transformer's base.
I have a document which shows typical values of these caps for Zenith radios and chose new cap values as listed on a similar configuration, which was obviously a discriminator transformer. (2@68pf and 1 @24 pf)

I drilled out the brass rivet, surgically removed the silver plated mica sheets and tabs from the base of my transformer and soldered it back onto the PC board. Then I added the new caps right onto the PC board. Now the AM and FM do not work at all. Turning the slugs MINIMALLY to re-tune the transformer to resonate at 10.7 Mc would be necessary but does nothing to change the issue. The continuity tests as it did before this operation.

Question: is there a resource where I can find the value of these caps specific to this transformer. I do not have a J W Miller catalog, which typically had a listing of catalog numbers for the OEM crossed to the replacement unit AND the characteristics of that replacement. Philco # is 32-4714-3, Miller; 1464-PC, Stancor RTC9050, Workman T658
__________________
"When resistors increase in value, they're worthless"
-Dave G

Last edited by DavGoodlin; 06-25-2014 at 10:11 PM. Reason: new part numbers
Reply With Quote
 


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 02:37 AM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
©Copyright 2012 VideoKarma.org, All rights reserved.