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 Post subject: Sylvania M-R Z5R Vacuum Tube
PostPosted: Feb Mon 22, 2021 10:28 pm 
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Joined: Feb Tue 16, 2021 11:13 pm
Posts: 5
Location: Apollo Beach, FL
Hello, I think I have a bad tube. It's not heating up or lighting up at all. It is a Sylvania M-R Z5R from a GM Cosmopolitan 252 radio. Does anyone have one and a source for one? Is there a replacement? Thanks.


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 Post subject: Re: Sylvania M-R Z5R Vacuum Tube
PostPosted: Feb Mon 22, 2021 10:36 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 27427
Location: Detroit, MI USA
That isn't the number of your tube.

M-R = Maintenance and Repair, which indicates a tube manufactured during WW2 for civilian use.

Z5R is most likely a date code.

Look at the tube layout for your set and see which tube it is.

_________________
Dennis

Experience is what you gain when the results aren't what you were expecting.


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 Post subject: Re: Sylvania M-R Z5R Vacuum Tube
PostPosted: Feb Mon 22, 2021 11:02 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 17148
Location: Mountains of Mourne. Ireland.
Rodney linked to the nostalgia air schematic here...
General Motors model 252
viewtopic.php?p=3339416#p3339416

Tube layout diagram.


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 Post subject: Re: Sylvania M-R Z5R Vacuum Tube
PostPosted: Feb Mon 22, 2021 11:26 pm 
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Joined: Feb Tue 16, 2021 11:13 pm
Posts: 5
Location: Apollo Beach, FL
Would this bulb recent music from the speaker? I’m only getting static.


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 Post subject: Re: Sylvania M-R Z5R Vacuum Tube
PostPosted: Feb Mon 22, 2021 11:37 pm 
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Joined: Jan Tue 31, 2012 1:55 am
Posts: 17148
Location: Mountains of Mourne. Ireland.
This radio is around 90 years old.
It needs to be completely assessed and restored by a competent technician.
You just can't plug it in and hope for the best.

If you discovered a 90 year old car in a barn - - - you wouldn't expect to drive it down the freeway - - - would you?


Greg.


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 Post subject: Re: Sylvania M-R Z5R Vacuum Tube
PostPosted: Feb Tue 23, 2021 6:56 pm 
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Joined: Oct Wed 14, 2009 6:36 am
Posts: 6478
Location: New York USA
It is also possible that someone stuck in an incorrect tube just to fill the empty socket, which will keep it from working. Check all the tubes against the tube layout diagram to be sure.


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