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: 5,088
Threads: 270
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: 5,088
Threads: 270
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: 7,286
Threads: 268
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: 5,088
Threads: 270
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: 1,874
Threads: 212
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: 1,600
Threads: 101
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
|
|
Philco 16B Parts
|
| Hi Dan,
Mike is correct, there's a lot of painted stuff on the chassis but it looks pretty good. The sm is all there,sp...Radioroslyn — 03:50 PM |
|
1930s Stromberg-Carlson Tombstone Radio need help identifying model number
|
|
Hi Cap'n Clock,
Unfortunately, I do not have this radio. This is a shame because this should be a good performer. 2A...captainclock1988 — 03:43 PM |
|
Philco 42-390, code 121 speaker
|
| Using a 5W 1.5k ceramic resistor in place of the field coil and using a 4 ohm PM speaker, I was able to bring the radi...Stevelog — 02:57 PM |
|
Philco 60 Squealing
|
| I have taken out the 2nd IF and found a problem or not. I believe the coils are litz wire. There is a very small strand ...dconant — 02:13 PM |
|
Philco 6K7
|
| I am restoring a Philco 37-60. The am reception is very good, but the shortwave is very weak. Run 6 Philco removes the g...bobbyd1200 — 01:35 PM |
|
1930s Stromberg-Carlson Tombstone Radio need help identifying model number
|
| Hi Cap'n Clock,
Unfortunately, I do not have this radio. This is a shame because this should be a good performer. 2A5...MrFixr55 — 06:48 AM |
|
American Bosch Model 802 auto radio
|
| I think it would come under either American Bosch or United American Bosch. American Bosch made sets for the American We...Arran — 05:53 AM |
|
trying to identify this wire type
|
| Thanks to all for the feedback. As Arran said, it is probably an older replacement and yes it has a grid cap so I will ...georgetownjohn — 09:32 PM |
|
trying to identify this wire type
|
| It's possible that the red wire, actually a grid cap lead, is a very old replacement, I can't remember seeing a pre 1939...Arran — 09:18 PM |
|
Gilfillan Brothers Car Radio?
|
| Hi everyone,
Special thanks to Joe Rossi for tracking down this obscure radio and thanks to others who took up the hun...Antipodal — 08:15 PM |
|
Who's Online
|
There are currently 6091 online users. [Complete List]
» 1 Member(s) | 6090 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
