Assignable/M-series/UA8000 mixing bus circuit

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Assignable/M-series/UA8000 mixing bus circuit

Postby ricardo » Mon Oct 31, 2011 7:01 pm

I worked on the Assignable/M-series/UA8000 mixing bus circuit in the early 80's. I did the work which led to the selection of the Allison (blue) hybrids instead of the DBX (black) hybrids.

This was definitely used in the Assignable and maybe in M-series & UA8000 too but my memory is hazy cos its 30 yrs ago. I'm after the actual mixing bus circuit.

IIRC, it was Allison current steering VCAs feeding the bus which was a 5534 virtual earth but may have been another Allison.

Also the tweaks which gave the linear P&G faders (on 10V?) the correct law for the Allisons.
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Re: Assignable/M-series/UA8000 mixing bus circuit

Postby jensenmann » Tue Nov 01, 2011 6:09 am

Give Jakob Erland of Gyraf Audio a call: http://www.gyraf.dk/
He used to service a UA8000 and has all the documentation.
Jens
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