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

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
Philco Model 38-7: what caps & resistors do fail typically?
Since you stated earlier, you have a console 38-7XX.  They also had a 38-7T (table), and 38-7CS (chairside).  A very nic...GarySP — 01:18 PM
Part numbers to model cross
That I wouldn't know, but sometimes the radio document itself shows one, same as the capacitor cans' etc pinouts.morzh — 12:46 PM
Part numbers to model cross
Thank you morzh, that is exactly what I was looking for. Now , is there some where that shows pinouts for Philco power ...Jim Dutridge — 11:37 AM
Restoration of the Canadian General Electric A-87
Thanks for your help Michael. In fact, this video is only an intermediate result. Later I had to apply another tinting l...RadioSvit — 09:01 AM
Restoration of the Canadian General Electric A-87
Great job on the cabinet. PS. In the US notation, "kenotron" refers to specific type of tubes; we call re...morzh — 08:24 AM
Part numbers to model cross
This document has at least some tables of models and parts used. Example: Choke 32-7572, used in 604 radio. Search f...morzh — 08:19 AM
Restoration of the Canadian General Electric A-87
I also checked all the radio tubes on my Hickok 530 tube tester. The 5Z3 kenotron turned out to be faulty, all the other...RadioSvit — 08:02 AM
Restoration of the Canadian General Electric A-87
Well... While the varnish is drying up, I started repairing the chassis... Of course I started by replacing the pa...RadioSvit — 07:12 AM
Philco Model 38-7: what caps & resistors do fail typically?
Hello Martin, Welcome aboard our little community what great Model 38-7 Sincerely Richardradiorich — 12:30 AM
Philco Model 38-7: what caps & resistors do fail typically?
Welcome to the Phorum Martin. I count about 9 paper caps, the 3 electrolytic caps and 2-Y2 safety caps to replace th...RodB — 09:44 PM

[-]
Who's Online
There are currently no members online.

>