got me a chorus, it dont work!

[jonathan perez]

you can see me in the knobs. 

its made by trinity amplification. it turns on, but no sound bypasses.

it also looks like its been rewired, based on the extra switch that looks like its been bypassed, inplace of the 3PDT?

i dunno. where do you fellas recommend i start pokin first?







also, what do you think this chorus is based off of?

[O]

Ha! I almost bid on that auction, but I never got a response back from Spira Mirabilis. I tracked the original auction down, but the original seller never answered either. Didn't the seller say that it was based on the Roland Jazz Chorus amp?

As far as where to start poking, I would probably swap the BBDs since they are the ones that usually go bad first (especially if the wrong adapter was used).

[jonathan perez]

i suspect as much. ill drop sockets in and replace with the ones in me CE-2 clone. i think its the same chips, ill report back tonight.

[jonathan perez]

i figured itd be a good project. 

[cheeb]

I wanted that. I hope it's a good one.  

With those teeny tiny little traces I'd be worried about one being cut/broken.

[O]

What is that 3rd unmarked IC? 

[Dirk_Hendrik]

i dunno. where do you fellas recommend i start pokin first?

Scope ready?

BBD input stage. Signal there? All before the BBD works.  No signal? Trace from input to the BBD in.

Otherwise work back from output to the BBD output.

Since the input of the BBD should have signal absence there means that half of the circuit is off initial suspicion. Either the pre BBD or the post BBD part.