Music Man HD 150

[xtian]

Ha...I have that effect on gear....
Could have been a bad connection on the IC (is it in a socket?)

Yes, ICs are in sockets. Cured by the Probe of Problem Fixing!

Let's hope.

[rdjones]

…and you're thinking, "well, that sounds OK, actually." And you'd be right, because now the amp is working!

I guess I knocked something into place. No idea what.

Fixed by accident!

Which chassis is it ? (chassis number on the rear plate)
The original thread described an HD150, your description sounds more like a 50W 1600 series chassis ("limiter").

In either case look at the speaker output jacks.
On the big amps they are wired in series on many versions.
On the 50RD they are switched for impedance by the extension jack, so even plugged into the main speaker jack the speaker power goes through contacts on the extension jack.
Either scenario can have issues.

rd

[xtian]

Hey, rd. If you look carefully, you'll see "Music Man 50-RD" in the post subject from a couple days ago. Sorry for the subtle switcharoo. Amp is already returned to the owner. Thanks, tho.