Cetec channel strip questions

[Futureman]

Hey all, I got 4 of these the other day, from an old american console circa '74 and powered em up... 3 worked perfectly, 1 sounded real bad...

It had no top end or even mids.. lots of low end distortion etc..

Even when the EQ was enabled, only the low EQ knob effected the sound, it seemed as though the high & mids did nothing..

The output from the Aux sends sounded the same as the output from the Bus & L/R outs..

Could someone please point me in a general direction as what components the more experienced techs out there would be blameing for this sort of fault?

Thanking you in advance
Regards
Mike

 

[sintech]

Hi Mike, these look nice,

I once had a similar problem with an Audix strip.. audio would pass ok, but it would be reduced to muffled distortion within ten minutes, power cycle and it was back. This was a bad cap, and took a little changing before I finally nailed it.

I would imagine either a bad cap or a bad opamp. If you have a scope you could trace from the input with a test tone, and see where the distortion kicks in.

Another way! thats been very useful in the past, and goes totally against the rule books! I've hotwired one unit to the other.. so jumping one part of the circuit from known good unit and feeding it to the bad, and ruling out blocks.

 

[befro]

12 years later. Curious how these Cetec modules sounded?