Acoustic 120 Bass Amp

[CJ]

today we have a transistor bass amp from Acoustic Control Corp, Van Nuys, California, came in with no power fuse so we put in a fuse to give it the smoke test, what did we get?

smoke!

here are some pics>

 

[CJ]

pulled a power transistor, shows a short from emitter to collector,

anybody know a good cross ref or should we use the same thing?

2SC1586, made by the Sanka Coffee Co., no wait,  SanKen,

 

[CJ]

here is some data on the power transistors,

 

[gar381]

Hi CJ

Why not just use the original part # 

decaf 2SC1586 sanka sand can be had for probably 3 bucks or so a pop.
try a www.EEM.com  parts search.

Best of luck...

GARY

 

[CJ]

yes, probably best to use original, and get some drivers also,
this direct coupled stuff can be touchy when trying to use cross ref parts,

 

[emrr]

Cool.  I love these amps.  I have one that started oscillating, and got set aside.  It needs a revisit. 

 

[mjrippe]

Yup, I had a 126 that I found on the street two years ago!  A few details and pix here: http://analogaudiorepair.com/2012/10/  Fairly certain I found original transistors for the output stage.

 

[CJ]

thanks for all input thus far,

this seems to be the pwr amp>

 

[CJ]

looks like they also used a Motorola p/n for this amp,

MJ15024

here are a few numbers on this guy>