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Antique Radio Technical Forum
Zenith 8Y02

Posted by Doug Criner on 04/14/2009 18:13

I can't seem to locate the schematic. Can you link it to us? Or, describe the set's circuit and tube line-up.

When the volume drops, and then comes back up, does it then stay up? Or does it keep going through cycles?

It'll take a while, but you can monitor the plate and other voltages of each tube, and see if one of them drops when volume drops. I would start with the oscillator section and then the RF and IF sections. The audio section may be OK, since you hear hum when the volume drops.

::Now, come on you guys! someone must have some ideas about where to start looking. Anyone? Mark from Kalamazoo
:::Hey, all. Looking for some ideas about a problem with this radio. Sometimes (but not every time) after it has been on for a couple of minutes or longer, the volume will start to drop until there is just a hum. After a few minutes, the volume slowly comes back up and the radio plays normally. I was hoping that the problem would worsen so that it would be easier to locate. I hate intermittent problems like this. I have replaced various resistors, paper caps, and the electrolytics in previous repairs. Any thoughts about what to look at first? Mark from Kalamazoo
:Are you married? If so, does your wife have a hair dryer? Do you have a Radio Shack nearby? If so, do they have cooling spray? Assemble the preceeding while study the schematic and we'll get together later.

Zenith 8Y02 
Mmakazoo 04/11/2009 17:56 
Mmakazoo 04/14/2009 16:03 
Lewis L 04/14/2009 17:19 
Doug Criner 04/14/2009 18:13 
Doug Criner 04/14/2009 18:17 
Lewis L 04/14/2009 18:26 
Mmakazoo 04/14/2009 20:01 
Mmakazoo 04/14/2009 20:08 
Edd 04/18/2009 19:20 
Mmakazoo 04/19/2009 20:42 

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