Subwoofer amp blows fuses

Thread Starter

Jack_K

Joined May 13, 2009
143
I just checked the two J111 JFETs and both were shorted D-S. I simply pulled them out and now the thing works. Well, almost. It works with the phase switch on 180*, but not on 0*. So it seems I need to replace U3.

Searched and cannot find any J111 JFETs. Will any N-channel JFET work? I have a box of 2N4416s. Would they work?

Jack
 

Alec_t

Joined Sep 17, 2013
14,280
The 4416s should only see about 14V across them; well within their rating.
If the J111s failed, have the LM324s survived?
 
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