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 Post subject: Schematic for Philco 46-200, 121 version?
PostPosted: Sep Tue 21, 2021 3:56 pm 
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Joined: Dec Mon 08, 2008 8:27 pm
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Location: alameda,CA
Yesterday I started restoring a model 46-200. It has some serious B+ issues and when I pulled the schematic its totally different than mine. What I find online is probably for an earlier version of the model, which has a 35Y4 versus the 35Z5 in my set as well as a bunch of other tubes that are not the same at all. So in other words I am sort of shooting in the dark here. The specific model is the same but with a "121" version instead. Any help would be appreciated.


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 Post subject: Re: Schematic for Philco 46-200, 121 version?
PostPosted: Sep Tue 21, 2021 4:19 pm 
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Location: Mountains of Mourne. Ireland.
Code 121 is always the first production.

Ten-page Philco trouble-shooting manual: https://philcoradio.com/library/downloa ... 6-1947.pdf
Subsequent Runs for Code 121 can be seen on pdf-page-nine.

from: https://philcoradio.com/library/


Edit: Additional documented changes attached below, thanks to Tom Bavis.


Attachments:
xxx-philco_46-200.pdf [4.68 MiB]
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 Post subject: Re: Schematic for Philco 46-200, 121 version?
PostPosted: Sep Tue 21, 2021 5:25 pm 
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Fantastic! Thanks Egg!


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 Post subject: Re: Schematic for Philco 46-200, 121 version?
PostPosted: Sep Wed 22, 2021 3:21 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Beaver Falls, PA. USA
During 1946-51, there were a lot of parts and tube shortages; a lot of changes were made "on the fly", and not all of them were documented.

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 Post subject: Re: Schematic for Philco 46-200, 121 version?
PostPosted: Sep Wed 22, 2021 11:04 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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In 99+% of the radios that used different based tubes, circuitry was same. Look up base diagram of tubes in radio and use that as guide vs schematic.


Attachments:
35y4.png
35y4.png [ 5.69 KiB | Viewed 79 times ]
35z5gt.png
35z5gt.png [ 5.68 KiB | Viewed 79 times ]
35w4.png
35w4.png [ 5.02 KiB | Viewed 79 times ]

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