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
HiFi (Chifi) tube amp build - but my own design.
Tim, nice write up and thanks for sharing !! Sincerely Richardradiorich — 02:47 AM
HiFi (Chifi) tube amp build - but my own design.
Well, this was a real "Hum-Dinger" :lol: ! This will be kinda long, but hopefully it will help others having t...TV MAN — 01:55 AM
Shadow Meter Bulb
Phorum members, I am trying to find the bulb # for PHILCO Shadow Meter part number 45-2180 that is from a 37-640 chassis...georgetownjohn — 06:53 PM
Philco 41-608 changer coupler
3D-printing...short of machining, of course. Or molding.morzh — 05:20 PM
Philco 41-608 changer coupler
Thanks, Morzh. That solves the issue of the rubber pieces. Now, I need to find a way to replicate the pot metal piec...alangard — 05:07 PM
12' Philco
If it is 12', either Kareem or Andre would have to jump pretty high to look at the front panel. Kareem would have an e...morzh — 01:48 PM
12' Philco
And here's a story about the tires on the truck. Same "no-stoop" guy must have installed these! Take care a...GarySP — 01:17 PM
Hickok AC51 tube tester
I think they have only shown the secondaries of the transformer. Two of them feed the rectifiers' filaments.morzh — 12:58 PM
IF can wire size and Rubber mounts?
Arran If the wire inside cans is the gauges you mentioned, the sole reason for that would be mechanical, to stiffen t...morzh — 12:56 PM
12' Philco
Rod, Yes, I know, but the Giant Philco is not around anymore either, so I go by whoever was alive fairly recently. H...morzh — 12:54 PM

[-]
Who's Online
There are currently 7723 online users. [Complete List]
» 1 Member(s) | 7722 Guest(s)
Avatar

>