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 91 Speaker Replacement
The spider is glued on the cone and so is the voice coil. I think you can use a cotton swab dipped in acetone and carefu...RodB — 02:42 PM
Restoring Philco 37-604C
Yes I saw that. If I knew, I'd probably try to arrange for getting it myself. But I have just got one. Which does not m...morzh — 01:44 PM
Philco 38-2 Automatic Tuning
When you push the lever, you are supposed to rotate the disk to the desired station. Then the magnetic tuning will acqu...morzh — 01:42 PM
Philco 38-2 Automatic Tuning
I figure out the muting from another picture that helped. Now I need to know how the automatic tuning works. When I push...dconant — 12:11 PM
Philco 91 Speaker Replacement
How would I go about removing the spider from the cone?dconant — 12:04 PM
Philco 38-2 Automatic Tuning
Hello, I am having trouble getting my automatic tuning to stay unmuted. If I play with the tuning handle I can get it to...dconant — 10:51 AM
Does anyone make photofinish replacements?
Here’s the link to the DIY photofinish section of our site: klondike98 — 09:46 AM
Delco car radio Peko vibrator converstion issues
Hi Richard, Thx for posting the schematic.  As I remember as a kid, these were great performers for the time, likely...MrFixr55 — 08:56 AM
Delco car radio Peko vibrator converstion issues
hello mr Fixr, The Electro  Powersupply that I am powering the radio with has a huge choke plus a 10,000ufd electrolyti...radiorich — 10:58 PM
Delco car radio Peko vibrator converstion issues
How about putting a choke in the power supply? The big cap was likely an attempt to stabilize the DC. Kids who cre...MrFixr55 — 09:19 PM

[-]
Who's Online
There are currently 2251 online users. [Complete List]
» 2 Member(s) | 2249 Guest(s)
AvatarAvatar

>