Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

Philco 640 - Caps in RF Transformer - Need Values
#1

According to the literature I have the descriptions for diagram #'s 16 & 17 state "Condenser, Part of 11". 11 is the RF transformer. No value is given for these caps in the parts list or in the schematic. I have not torn into the chassis yet. I'm just trying to put together my shopping list so I can order the parts I need. Anyone know what the value of these caps are?

[Image: http://antiqueradios.com/gallery/main.ph...alNumber=1]

Thanks,
Geoff
#2

Those look like mica resonating caps for the coil winding. I would just as well leave them alone as they are usually pretty reliable and most likely are a selected value.
#3

Agree: I would not touch anything in there unless absolutely warranted.
#4

Sounds like good advice. As I start tearing into it I'll try and determine what the values are and update this post for anyone else that may want to know. But I'll leave them in place.

Thanks,
Geoff
#5

Those are trimmer caps as indicated by the symbol. They really don't need to be messed with.
#6

13 & 14 are trimmer caps since they have the arrows on them but I don't think 16 & 17 are since they do not have the arrows. I'm not positive of this since I have not dug into the electronics yet.

- Geoff




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM
54C Complete Teardown/Rebuild
While I'm waiting to wrap up the final steps on my wife's Silvertone 2014, I started disassembly on the next project.  O...glyphmon — 11:07 PM
Preliminary work on wife's Silvertone 2014
Hello roy, that great news glad it worked out for you !! Sincerely Richardradiorich — 10:50 PM
Preliminary work on wife's Silvertone 2014
Safety caps arrived today.  Soldered one in and had a successful first power-up.  No magic smoke escaped and it tunes in...glyphmon — 09:53 PM

[-]
Who's Online
There are currently 1397 online users. [Complete List]
» 1 Member(s) | 1396 Guest(s)
Avatar

>