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I think production stopped on these right around the time of the original post. Perhaps @nomadradio knows better. My opinion, they were cool 18 years ago when they were cheap. But for perspective, an ameritron al811h was $900. Now its ~$1500. Interestingly the cb market's customers have not...

Whut? Where can i buy a magic 572B?

Whoops, i thought it was captain kilowatts build. Now i see it was someone else.

Whatever happened to this project? Did it ever get off the ground?

Building tube based amplifiers is 95% metal work, specifically cutting holes just right and putting them in ideal locations. The electrical part is very little time honestly. I can build almost any size amplifier in about 16-24 hours working time. The wiring and tune up / optimization process...

You could have built a new amplifier in the time spent repairing this one.

Veh cool. I haven't seen this model in 20 years.

Shorting switches are certainly superior, if you can get a big one. If guys would use an mfj to tune their tuners up before using power it would save them. Also, just dont move the roller under power. Move it a bit, then test.

Are you using it on the ham bands or just cb?

You didnt say you were an outboard audio guy.enjoy it

Squeals are always rf getting into the mic audio

Squeal or buzz?

"The dip" usually occurs at the same point as max power out. Try tuning up by simply adjusting the controls for maximum pep while speaking. If you cant generate a tone, say "claudio", and adjust all knobs.

Are you tuning it properly?

So I did almost the same thing as you, the only difference was I don't run the ground side of the lead down the handle towards me because if by chance that insulation never failed or something it would be next to my body. I make it come through the handle and then come at the side a little bit...

Leave it alone

This was on 120v. This is on 120v

But are you measuring pep?

You shouldn't need 200w to get 1000. Thats a poor amplification factor. Usually 75-100 ish should get you there.

Having as flat and smooth as surface on the heat sink as possible is absolutely advantageous to a certain point, I find that the people that polish the heat sinks don't take into account that they can polish grooves into the heat sink with whatever their polishing with, it's very easy to do on a...