SAE 2200. Could use some hints.

[joecoolman]

quick question

I'm working on an sae 2200 I found in a thrift shop. The output transistors were bad for one channel, but I figured I would just replace all of them. However, in my haste I didn't mark down the order that they were in (NPN PNP NPN PNP) or whatever. I would rather not trace the circuits myself so if anyone has this information I would be very appreciative.

Joe

 

[sregor]

Collectors of the NPN outputs go to the positive supply. The PNP collectors go to the negative supply. Your meter is your friend.

 

[ampexperts]

Has anyone had issues using MJ21193/94 in place of the MJ15024/25 recommended?
The specs are ALMOST identical except for Collector cutoff current, which is significantly lower on the newer OnSemi part. Mouser doesn't have the MJ15024/25 parts in stock, so I am considering alternative parts.

 

[llwhtt]

No problem with the 93/94 pairs, just rebuilt a 2600 using those. Those are the ones James Bongiorno recommended in his designs since the SanKens and Toshibas have disappeared.

Craig