Forums :: NEW! Web Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Oct Thu 29, 2020 12:09 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 12 posts ] 
Author Message
 Post subject: Need help - replacing dual elect capacitor on Philco 46-420
PostPosted: Apr Mon 20, 2020 4:03 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 25
Location: Cheyenne, Wy
I am working on a Philco 46-420 and need help with replacing a dual elect cap. There are 3 wires on one end (orange, red & blue) and one black wire on the opposite end.
I need to know how to wire up the replacement caps.
Schematic diagram attached.
Attachment:
Phil 46-420 Schematics.pdf [257.45 KiB]
Downloaded 46 times


Attachments:
20200419_101916.jpg
20200419_101916.jpg [ 4.49 MiB | Viewed 869 times ]
Top
 Profile  
 
 Post subject: Re: Need help - replacing dual elect capacitor on Philco 46-
PostPosted: Apr Mon 20, 2020 4:12 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 1241
Location: Earth
That’s not a dual section in your radio. That capacitor has 3 sections. That is why there are 4 wires leaving it.

What is the exact model number??

Philco used codes:

Ie. 46-420 code 125 is different then 46-420 code 121


Top
 Profile  
 
 Post subject: Re: Need help - replacing dual elect capacitor on Philco 46-
PostPosted: Apr Mon 20, 2020 4:14 pm 
Member
User avatar

Joined: Aug Tue 28, 2018 9:22 pm
Posts: 2564
Location: Sanford Fla 32771 (USA)
Try to loosen the mounting strap and rotate the cap and see if there is any printing on the cap. Also can you point out on the schematic where the three (red orange blue) wires are connected ?

_________________
Paul of Florida ….I had my patience tested. I’m negative.
https://paulsironhorse.smugmug.com/


Top
 Profile  
 
 Post subject: Re: Need help - replacing dual elect capacitor on Philco 46-
PostPosted: Apr Mon 20, 2020 4:30 pm 
Member
User avatar

Joined: Jan Tue 31, 2012 1:55 am
Posts: 14352
Location: Mountains of Mourne. Ireland.
The Philco ten-page factory troubleshooting service manual can be downloaded here→ https://philcoradio.com/library/downloa ... 6-1947.pdf

from: (service library) https://philcoradio.com/library/


Attachments:
code-125.png
code-125.png [ 224.19 KiB | Viewed 856 times ]
Top
 Profile  
 
 Post subject: Re: Need help - replacing dual elect capacitor on Philco 46-
PostPosted: Apr Mon 20, 2020 4:36 pm 
Member
User avatar

Joined: Jan Tue 31, 2012 1:55 am
Posts: 14352
Location: Mountains of Mourne. Ireland.
Image
:) Greg.


Top
 Profile  
 
 Post subject: Re: Need help - replacing dual elect capacitor on Philco 46-
PostPosted: Apr Tue 21, 2020 4:11 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 25
Location: Cheyenne, Wy
The model is 46-420 - code 125
I now see the schematic is for the code 121. Not sure how much diff there is....

I loosened the capacitor case. On the back it says :
Orange 30 mfu - 150 volts
Blue 25 mfu - 150volts
red 40 mfu - 150 volts
Black com neg

Regarding where the wires go:
Red wire -> rect tube pin 4 which has a wire to pin 1 (see pic). The rectifier tube is the one that the red and orange wires hook to.... Also note that there is another red wire from the rectifier tube to 50L6 Pin 6.

Orange wire -> Rect tube pin 8 then through resister to post with the blue wire (see pic)

Blue wire -> Connects to post see pic. Not sure what all it's connected to.

Hope this helps.


Attachments:
20200419_101943.jpg
20200419_101943.jpg [ 4.78 MiB | Viewed 809 times ]
Top
 Profile  
 
 Post subject: Re: Need help - replacing dual elect capacitor on Philco 46-
PostPosted: Apr Tue 21, 2020 4:17 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 25
Location: Cheyenne, Wy
Now that I have the info in my last post, could I simply add the 3 electrolytic caps with connections to the same place that the red, green and orange wires go, i.e., with the respective caps? And neg leads to where the black leads go?


Top
 Profile  
 
 Post subject: Re: Need help - replacing dual elect capacitor on Philco 46-
PostPosted: Apr Tue 21, 2020 4:23 am 
Member
User avatar

Joined: Jul Mon 26, 2010 8:30 pm
Posts: 29047
Location: Annapolis, MD
Have you looked at what Greg posted? The difference is in the values.

A common practice is to replace something like that with 3 separate capacitors.

_________________
-Mark
"Voltage is fun to watch, but it's the CURRENT that does the work."


Top
 Profile  
 
 Post subject: Re: Need help - replacing dual elect capacitor on Philco 46-
PostPosted: Apr Tue 21, 2020 4:01 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 25
Location: Cheyenne, Wy
Thanks....
I did look at what Greg posted...It was very helpful. Apparently I was not clear...
so again, my question is > can I simply replace the existing 3 cap unit with 3 separate caps, i.e., each cap connected to their respective wires (red, orange & blue) or connected to the same place as these 3 wires. And the black wire to it's respective place. I assume the black wire would be connected to the negative side of the cap???


Top
 Profile  
 
 Post subject: Re: Need help - replacing dual elect capacitor on Philco 46-
PostPosted: Apr Tue 21, 2020 4:20 pm 
Member
User avatar

Joined: Dec Wed 25, 2013 7:57 am
Posts: 4878
Location: USA
Yes :)


Top
 Profile  
 
 Post subject: Re: Need help - replacing dual elect capacitor on Philco 46-
PostPosted: Apr Tue 21, 2020 4:26 pm 
Member
User avatar

Joined: Jan Tue 31, 2012 1:55 am
Posts: 14352
Location: Mountains of Mourne. Ireland.
Yes, you can replace them with individual Electrolytic capacitors.


Here is a four-section replacement using Axial capacitors instead of Radials. In this example, the arrow points to the negative lead of the capacitor. (note: the body's crimped end of an Axial electrolytic capacitor is positive).

Image
photo: AlanBienlein.
viewtopic.php?p=2966174#p2966174

------------

Some of the old μF (microfard) values are no longer common... so choose the next nearest capacitance value, up or down.

Examples: 22μF, 33μF and 47μF are some of today's common values.

The Voltage rating of an electrolytic capacitor is how much juice it can handle.
This can be increased.

Electrolytics are polarized - with negative and positive leads. Mark the negative side in/on the chassis or circuit-board with a Sharpie before removing.

------------

Insulated solder terminal strips for mounting underneath the chassis.

Image

Image

ebay: https://www.ebay.com/sch/i.html?_nkw=so ... ps&_sop=12


Top
 Profile  
 
 Post subject: Re: Need help - replacing dual elect capacitor on Philco 46-
PostPosted: Apr Tue 21, 2020 4:33 pm 
Member
User avatar

Joined: Jan Tue 31, 2012 1:55 am
Posts: 14352
Location: Mountains of Mourne. Ireland.
Capacitors...
A "micro-microfarad" (μμF, and confusingly often mmf or MMF), an obsolete unit sometimes found in older texts, is the equivalent of a picofarad. In texts prior to 1960, and on capacitor packages even much more recently, mf or MFD rather than the modern µF frequently represented microfarads. Similarly, mmf or MMFD represented picofarads.

μF (microfarad)

pF (picofarad)

Random examples...
.002μF (microfarad) equals 2000pF (picofarad)
.00025μF equals 250pF

to convert from μF to pF
Here's a handy capacitor conversion chart.
http://justradios.com/uFnFpF.html

Greg.


Top
 Profile  
 
Post New Topic Post Reply  [ 12 posts ]  Moderators: Norm Leal, Marcc

All times are UTC [ DST ]


Who is online

Users browsing this forum: IGot2P, K7MCG, neondave and 35 guests



Search for:
Jump to:  


































-->


Privacy Policy :: Powered by phpBB