Any Zenith experts around Los Angeles?

[Findm-Keepm]

Originally Posted by Electronic M

Good advice. I'd like to add that there are sneaky ways to do it with sub-1KV meters. On some tube era sets the lower supply rail is 300-350V. I've (when I've lacked a 1KV meter) measured that 350V with respect to ground, recorded it, then measured the 900V rail with respect to the 350V rail (only a 550V difference), then added the two numbers...It's crude but it works in a pinch.

Brilliant! Never thought of that.

I just knew that we kept a VTVM for measuring boost. Blow a DMM once, and you'll never do it again. It was a selling point for Beckman meters back in the early 80s - you can measure Boost voltage directly, thanks to a 1500V DCV range.

Ground reference to B+ - another tool in the toolbox... Thanks.

[TinCanAlley]

All those things were tested a couple of years ago when I first got this set. It's all, pretty much, documented in previous threads. Tested the voltages at the socket, etc. All were in spec when tested back then.

There's ringing in a circuit and that's what I'm looking for with the jailbars. I'm pretty sure the problem with the setup circuit is a resistor. I have the replacements and will be working on replacing them.

Thanks