Zenith Porthole - Lapeer, MI

[jeyurkon]

Originally Posted by David Roper

This is one of the sets that uses a 6AG7 for audio output, right? That has always kind of intrigued me. 6AG7 is a prewar-era video amplifier that was utilized more in broadcast applications than in consumer sets. It also found use in some ham gear. But a Zenith TV set is the only place I've seen it used in place of a 6V6 or other ordinary power tube for audio output.

I didn't look at the tube chart before I put it away, but I assume you're correct. That does seem like an unusual use for it. I see the class A1 power output for that tube is about 3 watts.

I'm a little ticked at samswebsite right now. I purchased two e-files that were supposed to be for the Zenith G3276Z and one turned out to be for a Sparton radio and the other for a Teletone television. I had hoped to check out the 6AG7 circuit, among other things.

John