DATA DISCREPANCY PART N. 4231 FILTER CHOKES
Posts: 81
Threads: 24
Joined: Aug 2018
City: LAVERN-SUBIRATS
State, Province, Country: ESPAÑA
DATA DISCREPANCY PART N. 4231 FILTER CHOKES
I have a model 20. The choke was open. According to the Philco catalog from 1936, the resistance is 400 ohms. According to the information that appears in the library in its CHOKES section, a value of 4,000 ohms appears. Which one is correct?
One way to fix it is to rewind. Or replace a resistor with the correct value of approximately 4W.
What do you recommend? It's not easy to rewind.
I appreciate any information. It is important to correct the value if there is an error in the library.
Posts: 5,182
Threads: 276
Joined: Nov 2012
City: Wilsonville
State, Province, Country: OR
OK, thanks for pointing that out. I'll alert Nathan who manages the library.
Posts: 81
Threads: 24
Joined: Aug 2018
City: LAVERN-SUBIRATS
State, Province, Country: ESPAÑA
Posts: 5,182
Threads: 276
Joined: Nov 2012
City: Wilsonville
State, Province, Country: OR
Other folks will have to comment on whether a resistor of proper value would be OK, I don't know. As far as replacement, I have replaced a filter choke with a Hammond choke in one of my restorations and it went just fine. Here's a link to the discussion on the 66B restoration. Terry (radioroslyn) does suggest a resistor replacement as you'll read in the threads but I opted for the choke replacement.
Posts: 81
Threads: 24
Joined: Aug 2018
City: LAVERN-SUBIRATS
State, Province, Country: ESPAÑA
OK thank you very much
Regards,
Ferran
Posts: 7,303
Threads: 269
Joined: Dec 2009
City: Roslyn Pa
The circuit in the 20 is different than the 66 in that the 20 the choke is all of the HV @ 50ma or so. In the 66 it's just used for about a few ma up in the mixer.
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
(This post was last modified: 02-01-2022, 07:06 PM by Radioroslyn.)
Posts: 5,182
Threads: 276
Joined: Nov 2012
City: Wilsonville
State, Province, Country: OR
Thanks Terry, I wasn't clear. I didn't mean that the choke I used would be the one for the 20, just that the Hammond folks do have chokes that could be used as long as you select the right one.
Posts: 1,889
Threads: 214
Joined: May 2015
City: Seattle
State, Province, Country: WA
I looked back at the original source Philco parts catalogs.
Philco 1933 parts catalog:
Philco 1936 parts catalog:
All of the later Philco catalogs (1937, 1938, 1942) that we source from also say 400 ohms.
I'd say that 400 ohms the correct value. For the Library Chokes table I've updated it to be that value too.
Posts: 1,883
Threads: 120
Joined: May 2008
City: Omak
State, Province, Country: WA
hello Guys,
If I remember I am fairly sure that it should be 400 because I believe that what my 20 is.
Sincerely Richard
Posts: 81
Threads: 24
Joined: Aug 2018
City: LAVERN-SUBIRATS
State, Province, Country: ESPAÑA
This is the closest product I have found:
https://www.mouser.es/ProductDetail/Hamm...TtYRvn8nru
14H, 75mA, 429 ohm
I am concerned about the 75mA
Posts: 1,114
Threads: 14
Joined: Feb 2013
City: Irvington, NY
I would not be concerned about the 75 mA rating because the total power supply current drain of the model 20 is only 72 mA or less.
As shown in the attached service note chart, the total power supply current through the 80 rectifier is 36 ma per plate, for a total of 72 mA. The actual total plate current drain of the other tubes is only 48 Ma, the remaining current being dissipated in the bleeder resistor and associated circuits.
https://philcoradio.com/library/download...n%2036.pdf
Posts: 81
Threads: 24
Joined: Aug 2018
City: LAVERN-SUBIRATS
State, Province, Country: ESPAÑA
You are right. Thanks for the help. I will buy the choke.
Model 20 is one of my favorites.
Regards,
Ferran
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
Looking for any info: 1977 Ford-Philco Console Hi-Fi Turntable and Radio
|
| Hello PittsburghToast ,
Welcome aboard and it looks like gary may have something for you !
now if I dig through my se...radiorich — 11:35 PM |
|
Model 80 Antenna Issue?
|
| You are kind of on the right path. You can touch the grid cap of the Detector/Oscillator 36 tube. I'm expecting a respon...RodB — 08:48 PM |
|
Looking for any info: 1977 Ford-Philco Console Hi-Fi Turntable and Radio
|
| Welcome to the Phorum, PittsburghToast! I found an old thread that my interest you regarding the quality and worth of P...GarySP — 08:48 PM |
|
Looking for any info: 1977 Ford-Philco Console Hi-Fi Turntable and Radio
|
| Welcome to the Phorum!
:wave:
We do not have anything on that unit in our digital library. There is a Sam's Photof...klondike98 — 08:47 PM |
|
Model 80 Antenna Issue?
|
|
I’ve replaced all the caps and resistors and the radio is working but minimal volume unless I put my hand near the re...Hamilton — 08:24 PM |
|
Looking for any info: 1977 Ford-Philco Console Hi-Fi Turntable and Radio
|
| Hi there! this is my first time posting. I recently picked up this Ford-Philco Console record player and radio at a yard...PittsburghToast — 07:28 PM |
|
philco predicta
|
| I found that where I have the 140v B+ there is 50v and the tuner receives 235v through the orange cablecgl18 — 04:14 PM |
|
Philco 91 code 221
|
| Chassis grounds thru rivets is another good place to look. Oh and the stator screws on the tuning cap where the leads at...Radioroslyn — 08:11 AM |
|
Philco 91 code 221
|
| Dirty tube pins and socket, cold solder joint, stray tiny strand of wire, clean the entire area around the oscillator tu...RodB — 08:43 PM |
|
Philco 91 code 221
|
| I have been restoring one of these sets and switched it on yesterday. It didn't exactly spring into life, but after a co...Philconut — 08:26 PM |
|
Who's Online
|
There are currently 1321 online users. [Complete List]
» 2 Member(s) | 1319 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
