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

Need help selecting choke filter
#1

I just finished restoring a 40-180. It works fine, but the 12 inch speaker has a big hole in it. Instead of re-coning the speaker. I decided to replace it with a PM speaker I got for 16 bucks.  good speaker actually. So I need to replace the choke. The original speaker has an 1100 ohm choke/ magnet. The radio draws  60watts. the chokes I find online that are rated for 500ma only have a resistance of 50 ohms. So should I choose this choke and add a 1K ohm 10 watt resistor to match the original speakers resistance? I initially installed a choke with a resistance of around 1100 ohms which matched the original coil's resistance, but it gets a little warm when running, and it's rated at just 35ma. 
#2

500ma is WAY to much! What you are looking for is something around 60-75ma. Here's a 15H choke https://www.tubesandmore.com/products/fi...15-h-75-ma
The resistance is a bit lower than your fc. If you don't use a series resistor it will increase the HV. With that being said don't think it's going to make much of a difference as the maximum plate voltage for the tubes in your set is greater.

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




Users browsing this thread:
[-]
Recent Posts
HiFi (Chifi) tube amp build - but my own design.
Tim - Photos of 8 octal tube sockets. (Top and bottom) Send me a PM if you're interested.RodB — 04:11 PM
VTVM meter moves when my hand is next to it & not on
Haha! I hope so. It seemed rather lost and forgotten languishing in the frozen Northeast of England.EdHolland — 02:36 PM
VTVM meter moves when my hand is next to it & not on
Ed - it's in the Cayman's enjoying the good life.RodB — 02:14 PM
VTVM meter moves when my hand is next to it & not on
Static electricity - but the other chaps beat me to it again. I've seen this before with analogue meters. I've also ...EdHolland — 01:56 PM
Need to purchase some accessories for restoration of my Old Philco Radio
Hi Paulo, Welcome to the Philco Phorum. I can see why you want to find good reproduction parts. That is a bea...MrFixr55 — 11:10 PM
HiFi (Chifi) tube amp build - but my own design.
Tim, I have some bakelite sockets in my work shop that I can dig up. I believe quite a few are NOS. I will take photo...RodB — 10:03 PM
Philco 610B oscillator wiring
> The cathode as noted is wired directly to the ground side of the heater filament for that tube, not to the #17 and ...Radioroslyn — 08:12 PM
HiFi (Chifi) tube amp build - but my own design.
Tim; I noticed your post a little late, but I would take one of the junk sockets and try to break a chunk out of it wi...Arran — 08:07 PM
Need to purchase some accessories for restoration of my Old Philco Radio
Here is a list of resources found in our online library that you might find useful. Mike's Gobs of Knobs email addres...klondike98 — 01:46 PM
First Radio restoration
Hi Tubeman, Welcome to the Philco Phorum.  Phamily Phriendly Pfun with Phine Pholks Phull of Philco Phacts. (See a p...MrFixr55 — 12:33 PM

[-]
Who's Online
There are currently 1490 online users. [Complete List]
» 1 Member(s) | 1489 Guest(s)
Avatar

>