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205.188.116.16
When I bought this Scott 222c at an estate sale it was dead, I figured the fuse, which it was not, I was told it was the input transformer, which it was. I don`t know a lot about electronics. After a recent electrical storm (it was off) the next day it was totaly dead. Fuse is Ok.
Before I go nuts trying to locate another input transformer could it be anything else that would make it stone dead?
Thanks, Len W
from Hot Glass Audio, a total rebuild. The work looks great - I can't hook it up 'til tomorrow. Can't wait.
DO NOT run this unit without doing that first, otherwise you risk destroying the power transformer. That may have already happened, its unclear from your post, as it sounds like you got it to do something.
You might also have a bad power switch, that's not all that uncommon on these. But don't fall for replacing the switch and running the unit- the filter caps will bite you hard! Definitely worth fixing- cosmetics are nice.
I have used this amp about 2 yrs (after replacing the input transformer) it just seemed strange that another transformer would croak.
Hopeing for something easier to fix.
The filter caps are shot. That's why the first transformer failed and now the second one.
Suggestion: If the electrolytic caps are OEM or older than 15 years, replace ALL of them. Not just the main power supply. This includes any bypass and bias power supply caps. I've haven't heard of a tech that replaced a power tranny without checking for reasons (like old 'lytics). That is not a tech you want to use again. Sprague ATOMS are fine for your vintage unit.
I have 2 Scott 222D amps waiting to be rebuit. I have not turned them on because my understanding is that these things a grenades if you do not to a complete rebuild. The filter caps, infact all the caps including the signal path capacitors are suspect. Of course the selenium rectifiers should be chagned too!
Dave
Yeah, even when I rebuild these old amps (and I've done a lot of very old guitar amps... like even some pre-WW2), I always ramp up the amp on first fire-up. I've caught some boo-boo's and bad NEW components that way, before major damage was done to these precious units. I know most folks do not ramp up units which have had their electrolytic caps replaced. But, I do. It doesn't hurt. I've yet to have a replacement set go bad prematurely on me. And most of the folks whose amps I've worked on, crank the hell outta the things right off the bat. Just one of my peccadilloes.
That sounds like a good idea to me!
Dave
Could be a number of things, definitely worth fixing.
It could just be the power switch. If you have a voltmeter at your disposal it would be easy to check. Nice looking unit.
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