Re: Quad 44 Control Unit
Dada Electronics can be trusted for decent advice, spares and tweaks, although the later 44 was better than the earlier one. They also have a "Revision Blogspot" which may be of help in service and troubleshooting.
At least Quad still have a service department in Huntingdon, although their repairs tend to be of the get-you-going type, rather than full refurbishments.
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