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Old 07-20-2018, 09:09 PM
ESigma25 ESigma25 is offline
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Found some old Zenith tube radio...

My stepdad randomly surprised me with this old Zenith AM/FM tube radio that someone had thrown in the trash(!!!!).

https://i.imgur.com/1QCDYSj.jpg

Unfortunately for me it doesn't work. Is there anyone who could maybe help me identify this radio so I can work on trying to fix it?
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Old 07-20-2018, 10:19 PM
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Electronic M Electronic M is offline
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Don't know the model but that is one of their more common offerings...there was a more boxy cabinet version and plastic cabinet versions that I used to own.

It may still work fine on the original caps, but if not you can easily recap it without a schematic if you have changed the caps on another tube radio before.

Search eBay odds are one is for sale now and if the listing has a model number you can use that to search for service literature.
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Old 07-21-2018, 08:29 AM
WISCOJIM WISCOJIM is offline
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http://radioatticarchives.com/radio.htm?radio=12716

https://www.radiomuseum.org/r/zenith_g730.html

.
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Old 07-21-2018, 06:29 PM
ESigma25 ESigma25 is offline
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Yeah, I was dumb and didn't check the underside, says G730 plain as day...

I took the back off and noticed every single tube had managed to creep out of its socket, including the one in the metal sheath. I reseated all the tubes but it's still completely dead, it seems.
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Old 07-21-2018, 06:48 PM
Titan1a Titan1a is offline
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Check and replace selenium rectifier and caps.
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Old 07-21-2018, 06:55 PM
ESigma25 ESigma25 is offline
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Yeah, unfortunately that's way above my skill level. I guess I'll just hold onto it until I can find someone to repair it.
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Old 07-21-2018, 06:57 PM
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If the heaters don't light either one is open (usually the higher voltage ones), or there's an open in the power cord or switch.
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Old 07-21-2018, 07:51 PM
ESigma25 ESigma25 is offline
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So how exactly do you power up one of these radios that uses an interlock while having the back off?
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Old 07-21-2018, 07:53 PM
WISCOJIM WISCOJIM is offline
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https://www.ebay.com/sch/i.html?_fro...d&_sacat=73374
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Old 07-21-2018, 08:55 PM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by ESigma25 View Post
So how exactly do you power up one of these radios that uses an interlock while having the back off?
Remove the chassis from the cabinet and then you can reengage the interlock to the chassis.
The wooden cabinet models use the old style interlock connectors that Zenith used from the early days. Either that or make a test cord with insulated alligator clips and a standard power cord.
BTW, take notice how the speaker leads are connected before removing the chassis. Some of those wooden cabinet models used an electrostatic tweeter and the leads connect differently.
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Old 07-22-2018, 11:02 AM
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I have an early 60s plastic Zenith AM/FM clock radio that has a very similar chassis to yours, the main difference is mine has a silicon rectifier and all the coupling capacitors in it are ceramic disc types. I did see the one wax/paper capacitor on the back, so likely there's more inside. Those wax/paper caps should be considered bad at this point and should be replaced.

My Zenith was working as found, despite the original filter caps. It seems like I had to clean the power switch on it once though.

These sets are transformerless and a bit dangerous if you don't know what you're doing, as the chassis can become "hot" if it's plugged in backwards. And if it has a selenium rectifier that should be considered bad too. You might have to get the chassis out of the box to access it though
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