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

R.F choke
#1

Ive actually got 2 questions on this topic. I think I read somewhere that a RF choke isn’t really needed today… Is that true or should I put one back in? Also, it’s a .2 MFD and the closest cap I have is a .05 MFD so, should I install that in its place?
#2

I think you should a couple of .1 use two in parallel (=.2mfd). No you don't need to recreate the coil around the .2 cap.

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
#3

Unfortunately the container holding the caps fell off my table and spilled a few weeks ago and thought for sure I found all of them but apparently not because I’m missing the 3 .1’s you gave me and the .15. I’m a little frustrated at the moment at myself because you were so kind to send me them for nothing and I’ve gotta order them because
#4

I did manage to find 3 .1 caps, I forgot they were marked 304K. I’m at a loss of where the other 2 are since they’re so big. So I ordered 2 of those and the .015 I’m missing
#5

Why wouldn't an RF choke be needed today?

The RF chokes found in the antenna circuit, to filter out 455khz aren't needed (mostly). But the chokes used to keep RF out of an amplifier are still useful.

"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
#6

I’m not talking about a amp though
#7

Terry, 

Where does the other end of it go. One lead goes to 7C6 according to my pics (I’m not trying to map things out on the schematic because it’s mostly hard for me to follow.  I tried but my learning disability is fighting me) but, the other lead is missing totally. (Still trying to figure out why some of them had missing 2nd leads and others didn’t but that could explain partly why the previous owner got the pilot light to light but the radio didn’t make any noise
#8

In this case I was referring to any tube/stage that provides signal gain and might amplify unwanted RF.

"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/




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.

>