Posts: 2,572
Threads: 337
Joined: Jun 2013
City: lawrenceville nj
Hey guys
Working on 42-1003 code122
Has 8 tubes
In center is card board tube I think it’s suppose to be 40 electrolytes on both pins ? Schematic is ver bad to read I think looks like 5 electrolytes all together did recap went from low hum to loud hum light did work on chassis now not
Thanks sam
Some day, and that day may never come, I will call upon you to do a service for me. But until that day, accept this justice as a gift
mafiamen2
Posts: 7,288
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
Hi Sam
I got six. #72 47mf@160v X2
#11 6mf@ 160v
#60 10mf@35v
#12 10mf@50v
#81 10mf 160v
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: 09-06-2022, 01:02 PM by Radioroslyn.)
Posts: 2,572
Threads: 337
Joined: Jun 2013
City: lawrenceville nj
Terry
Ok I see 6 I don’t see where #81 is
Can not find a good schematic for code 122
If I replaced all caps why still humming ?
Some day, and that day may never come, I will call upon you to do a service for me. But until that day, accept this justice as a gift
mafiamen2
Posts: 7,288
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
I couldn't find 81 either. But it's listed on the parts list and it's outlined on the under the chassis diagram under the tuning cap.
As for the schematic you gotta work with what you can get. The used the one in the library. Sometimes the service bulletins are better but we don't have that one. Maybe Andy has it and it's yet to be added to are files.
>Why is it still humming? There's a whole lot of possibilities. The short answer is there's ac getting somewhere it's not suppose to be. How are the dc voltages? Across the filter caps and plate and screen grid voltage on the output tube?
OBTW ru going to grace us with ur presence @ the town of K?
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
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
It's in the service info, page 3 (page 121), bottom right of the page - but it isn't made very clear.
https://philcoradio.com/library/download...20Book.pdf
Here's a close-up.
I attempted to clean this up, but the quality of the original is very poor.
--
Ron Ramirez
Ferdinand IN
Posts: 2,572
Threads: 337
Joined: Jun 2013
City: lawrenceville nj
Hey Terry
I will come Saturday
Some day, and that day may never come, I will call upon you to do a service for me. But until that day, accept this justice as a gift
mafiamen2
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
You're welcome? 
--
Ron Ramirez
Ferdinand IN
Posts: 7,288
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
Tnx Ron,
Not quite sure why they are using a 50L6 as a rectifier but it's academic at this point as Sam's set doesn't use it.
I tend to be myopic and just lookup diagram not all the changes.
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
Posts: 2,572
Threads: 337
Joined: Jun 2013
City: lawrenceville nj
Ron
Big sorry and thank you
I seen yours and terrys response and just wanted him to know I was going to k town
I am now just sitting down to look at darn radio
And mine has 3 50L6 ‘s and it has the 10 electrolytic which I replaced and replace the 2 40’s in can. 1 6 and 10 so I have to find the on that’s missing
Sam
Some day, and that day may never come, I will call upon you to do a service for me. But until that day, accept this justice as a gift
mafiamen2
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
 
Yes, I too find it strange that Philco used a 50L6GT - an audio output tube - as a rectifier for the field coil. Very strange indeed.
--
Ron Ramirez
Ferdinand IN
Posts: 1,033
Threads: 9
Joined: Jul 2020
City: Greenlawn
State, Province, Country: NY
This is definitely one of the weirder schematics that I have seen! I can understand using a 50L6 as a rectifier (I have seen that done with Emerson and RCA Lunchboxes with 37 triodes pressed into rectifier duty) but a 50L6 as a local oscillator for the 1st detector? There must have been a fire sale on 50L6s somewhere. I know that there was a war on (Production must have ceased shortly after the line was introduced), but i can think of better uses for 50L6s, like a push pull amp, voltage doubler rectifier (after all, the Phono makes this an AC Only set), etc.
2 things to look at. If your unit has the electrodynamic speaker (the reason for the 50L6 Rectifier), check the phasing of the field coil. I don't see a hum bucking coil in the schematic, but since there is only a 10 uF cap (81) filtering the output, phasing may be an issue. If you are missing C81, that's an issue too.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
(This post was last modified: 09-09-2022, 08:56 PM by MrFixr55.)
Posts: 1,033
Threads: 9
Joined: Jul 2020
City: Greenlawn
State, Province, Country: NY
One other thing. Does it hum loud with the volume control all the way down? If so, then my diatribe above is the likely cause.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
Posts: 2,572
Threads: 337
Joined: Jun 2013
City: lawrenceville nj
Guys
With volume low it hmm low
The more you turn up louder hmm gets
I will bring to k town maybe Terry can look at it
Sam
Some day, and that day may never come, I will call upon you to do a service for me. But until that day, accept this justice as a gift
mafiamen2
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
New Philco Repair Bench
|
| I am sure this is the archive, and not the Chuck's site.morzh — 09:50 PM |
|
Made mistake & did not label connection
|
| It's not like we are good friends with that wire and can tell it from other ptetty identical looking wires.
Why'n't you...morzh — 09:49 PM |
|
Made mistake & did not label connection
|
| I'm not sure why that wire wasn't covered in the video. I'm pretty sure the 6A8 won't work until that pin is grounded. Y...RodB — 09:47 PM |
|
Made mistake & did not label connection
|
| You'll have to forgive me, I am not sure what you mean. Can you explain what you are really saying. If anyone does not...georgetownjohn — 08:05 PM |
|
Made mistake & did not label connection
|
| Those are details better left to the ones who know. Maybe you disconnected the wrong end of the wire.RodB — 06:22 PM |
|
Made mistake & did not label connection
|
| Maybe this is starting to make some sense in my hard head. Is this why the wire in question was not in the great Ron Ra...georgetownjohn — 04:34 PM |
|
Made mistake & did not label connection
|
| I was correct with the 6A8 pin connection's, 7 and 8 are connected to ground as well as the tube shield (the broken line...RodB — 02:41 PM |
|
Made mistake & did not label connection
|
| What does the dotted line representing that surrounds the tube in the schematic?georgetownjohn — 02:17 PM |
|
Made mistake & did not label connection
|
| Hello John,
I have been there either label got lost or was not labeled !
Sincerely Richardradiorich — 02:15 PM |
|
Made mistake & did not label connection
|
| Sorry, it is a Philco 37-640. Does that help?--Johngeorgetownjohn — 02:14 PM |
|
Who's Online
|
| There are currently no members online. |
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
