As a matter of routine I replace 1/2 watt resistors with 1 watt, and 1 watt with 2 watt.:smoke:

When I was a 10 year old kid, I used to design and build my own flying model airplanes. Obviously, "The Flight of the Phoenix" was one of my favorites. Still is.:smoke:

I built two. The first was one of the ones that was attached to the string. So you started it up and you swung it around in a circle. Second one was a complete RC model. Loved them both.

Now that she's burned in for about 10 hours total, I noticed the HV has climbed slightly past 4kv. Also the crackling sound is now limited to a brief time (3-4 seconds) on start up. No more tics.

I'm going to call this one done, barring any relapses. But since I've replaced all the caps except a handful of micas in the sound and IF stages, I don't anticipate that.:smoke:

The HV improvement and reduced "tics" do point to possible slight flyback moisture or similar issues, don't they?

Yep. Thought the same thing. It's about the only thing I didn't replace.

Been watching it further, and now she has barely any tics on warm up. She's fine.:smoke:

Don't want to nit pick, but this is an electrostatic set so shouldn't it have an HV coil rather than a flyback.

It does have an RF-type HV supply, but those coils seem susceptible to moisture. Some people bake them in an effort to drive out moisture and squeeze out more HV.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

A good nit to pick. We should call it what it is.

By cleaning it with alcohol, followed by a blow dryer and burn in, the HV is back to normal.

Hi Phil. You going to ETF?:smoke:

Um, probably. We have a remodeling project (endlessly) underway and there is a constant stream of surprises & questions.

Phil Nelson

Oh, I know what you're going through. The family has made me point man on the summer home renovation.

Fortunately I'm just coordinating it all. Two work crews are doing the actual labor. But they are maistros. Their work is superb.

When they're done, I'm going to pick out one of the rooms as a lab for tv restoration. :smoke: