4.06.2003
Audio Asylum Email from steven oda:
Josh,
Didn't want to post this, but did you modify the PT or OPT when you put in the
new electrolytic caps? When the amp is turned off the magnetic field around the
transformers collapse and convert to a brief electrical surge. The bigger the
iron, the bigger the surge. That after market filter board may not have taken
EMF collapse of a bigger tranny into consideration.
The PS filter caps and chokes' values are designed to absorbed part of this
flyback. I know that guitar amp DYI'ers get into hellacious trouble when they
start fooling around with PS caps & trannies. Sometimes, they get a loud whack
(loud enough to ruin a speaker), when they turn their DYI amps off. Reason,
seems to do with time constants & letting the components get TOO FAR from
nominal values. O'Connor, in his TUT1 and TUT4 has a great dissertation about
this problem and how to solve it----the cheapo way and the correct way.
Josh,
Didn't want to post this, but did you modify the PT or OPT when you put in the
new electrolytic caps? When the amp is turned off the magnetic field around the
transformers collapse and convert to a brief electrical surge. The bigger the
iron, the bigger the surge. That after market filter board may not have taken
EMF collapse of a bigger tranny into consideration.
The PS filter caps and chokes' values are designed to absorbed part of this
flyback. I know that guitar amp DYI'ers get into hellacious trouble when they
start fooling around with PS caps & trannies. Sometimes, they get a loud whack
(loud enough to ruin a speaker), when they turn their DYI amps off. Reason,
seems to do with time constants & letting the components get TOO FAR from
nominal values. O'Connor, in his TUT1 and TUT4 has a great dissertation about
this problem and how to solve it----the cheapo way and the correct way.
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