Sound city overhaul

20 Studio, 50+, 50PA, 50R, L100, B100, L120, L120PA, L120R, 120 SLAVE, B120, B150, L150, L200, B200, Concord, and SMF

Re: Sound city overhaul

Postby James R on Wed Feb 01, 2012 10:55 pm

Could they be BA, British Association. I may have some BA here in and old tin, I'll take a look.
James R
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Joined: Wed Feb 01, 2012 8:47 pm
Location: Monroe NC USA.

Re: Sound city overhaul

Postby Whipper on Tue May 14, 2013 9:01 am

Nice one for posting such detailed pictures of the inside of the amp. I have a Sound City B120 Mk4 that i'm making some progress in repairing. It needed a mains filter cap job as some of the innards were blown to pieces!! It made all the difference being able to reference your photos to find the points where the components go. Some were wired incorrectly.

I have sound now going to the speaker which is great! But have a lot of noise too. So that's the next task.

Cheers anyway made my life a lot easier.

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Joined: Mon May 13, 2013 7:12 pm

Re: Sound city overhaul

Postby Mr. Foxen on Sat May 18, 2013 8:20 pm

I've done tons since, see blog for pics of some. For noise, replace the blue and white dubilier caps, most have been leaky, and replace basically all the resistors in the preamp, and all electrolytics everywhere including the small ones. That has sorted most noise in most of them. Also clean the earth points, the screwed down ones get dirt in from the exploding stuff, and cause issues.
New music:
Gear tinkering blog:
Made a Facebook page for my ampguts stuff. Feel free to come post amp guts and rig shots:
Mr. Foxen
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