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Fixing UA La-610 Compressor (need schematics with voltage points)

Hi guys,

Like the title says, I got one of my two LA-610 who doesn't compress anymore.. the action faded over a few months.
I tried to change the tubes and even exchanged the opto cell with the other LA-610 and it did no good.

So I guess a cap or a resistor failed.. I'd need some guidance and some precise schematics

Thanks in advance.

Rogers BBC monitoring speakers LS 5/8 bi amplified with Quads 405

Hello everyone -

2 easy questions :
1. Which pre-amp would you recommend that has balanced inputs and a nice warm sound

2. Would there be any point in using a nice old Glensound mixing console as a pre-amp or would i get nothing out of it soundwise ?

Thank you so much, dear friends

Kind Regards

Alexander