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previous: Enzo Those bad parts don't make sense. U... -- 1141893090 View Thread

Re: Crate GX-212 on the bench (schematic?)

3/9/2006 3:44 AM
Erik MillerRe: Crate GX-212 on the bench (schematic?)
>Those bad parts don't make sense.  
 
From the amount of tracing I could do, it seemed like the damage was all over the place. There's a blown trace in there somewhere, too, nowhere near the fried parts.  
 
I was thinking some kind of line surge? Lightning?  
 
>You got the values right.  
 
Thanks. As blackened as they were, I'm surprised they lived.  
 
>But the 10k R47 is in series with a film cap. how >would it burn up? It iss just a rolloff network >after the P6 level pot.  
 
That is weird. I'll let you know. In series with a cap?  
 
This kid must have been messing around somehow. But the amp showed no signs of clumsy entry, and the board had never been pulled. All screws perfectly torqued to the same tension....  
 
>If Q6 is bad, better check Q22, and any other JFET >on line B - see drawings.  
 
Will do.  
 
>And R43 is also in series with a cap on the way to >GAIN1 pot.  
 
He must have taken it in the tub and then tried to plug 120 into the in jack.  
 
>Forum etiquette suggests that if you ask for >schematics you might put up an email address so we >can send you one.  
 
(red face)  
 
Sorry for the etiquette violation. I forgot that we can't PM each other on Ampage.  
 
erik at erikmiller dot org should do it....