42-1008 Revisited

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42-1008 Revisited

Eric T
Senior Member

Posts: 298
Threads: 22
Joined: May 2012
City: Chattanooga State, Province, Country: TN

09-01-2013, 08:30 PM

Yes, this radio has an XXL Converter, which I replaced with a NOS tube last December. It's still good.

I just busted out the signal generator and O-scope. Went to the oscillator plate first- good signal, frequency varies with tuning gang. Icon_thumbup

Next, I checked the converter plate- nice signal there. Icon_thumbup

Moving on, plate of the first IF amp- nada, zip, zero. Icon_thumbdown

Checked the grid- nice signal. Looks like a bad 7B7.

This set has two 7B7 IF amps, which makes eliminating faults in the associated circuitry a bit easier by swapping positions. So I swapped them and checked the first IF amp with the other tube in there. Good plate signal and even some reduced volume audio tone coming out of the speaker. Bad tube for sure. Icon_wink

Wow, it's almost like I know what I'm doing.

It's not how bad you mess up, it's how well you can recover.

(This post was last modified: 09-01-2013, 08:33 PM by Eric T.)

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42-1008 Revisited - by Eric T - 09-01-2013, 07:21 PM

RE: 42-1008 Revisited - by Electrothaumaturgist - 09-01-2013, 08:04 PM

RE: 42-1008 Revisited - by Eric T - 09-01-2013, 08:30 PM

RE: 42-1008 Revisited - by Eric T - 09-01-2013, 09:07 PM

RE: 42-1008 Revisited - by Electrothaumaturgist - 09-01-2013, 09:34 PM

RE: 42-1008 Revisited - by Eric T - 09-03-2013, 11:29 PM

RE: 42-1008 Revisited - by Electrothaumaturgist - 09-04-2013, 02:02 AM

RE: 42-1008 Revisited - by Eric T - 09-04-2013, 10:27 PM

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