Orion 2250 Gen II output help

[Perry Babin]

In the attached image you can see the 07 and 57 pre-drivers. The drivers to the left of those are reversed (07 at the top, 57 at the bottom).


For when you have to remove the clamps, I'd suggest that you do it like THIS.

 

[Dr Zeus]

Thats exactly how I just isntalled them. Who the heck knows why this amp had three 57s in that one channel. I dont think anyone ever repaired this amp...

 

[Perry Babin]

You may have pulled the wrong one out of the other amp.

 

[Dr Zeus]

Maybe. Probably. In any case this amp is fixed! Turned out to be two output transistors, two resistors, and two MPSUx7s. I fixed it from taking parts from a really beat Orion 2150 amp.

 

[Perry Babin]

It's not going to be reliable with mixed output transistors. For it to be reliable, you'll need to replace all of the outputs in the blown channel.

 

[Dr Zeus]

I know that. I actually ended up using somewhat matching transistors that came out of the Orion 2150; same vintage. I'll have to ask the owner if he wants to pay the $$ to replace them with brand new pieces. I'll probably need new emitter resistors too. Really, this amp came from a collector and will likely never be run. He's got like 6 of these under his desk! LOL! Hes giving me a lot of work!

 

[spooney]

Replace all those outputs and pray you never have to source any of those mpsu07's and 57's. They were pretty pricey last time I checked. Almost to the point where I thought about not fixing the amp.