This mod came about becuase could not get the 4 bit cpu MP4480 or the TMS1000
so made it a manual tuning ,up to now after a day no drifting, so removed the IC1 and pin 12 link to REF h just above the IC1 this puts a high on the enable IC6 allowing knob voltage to tune the variacs , ,, attached the drawing
so made it a manual tuning ,up to now after a day no drifting, so removed the IC1 and pin 12 link to REF h just above the IC1 this puts a high on the enable IC6 allowing knob voltage to tune the variacs , ,, attached the drawing
I understand that a replacement CPU with increased functionality giving more presets, 2 per button is now available from Quad
Stuart
Stuart
You can do this by just strapping pin 12 to pin 26 in the socket after removing IC1. Pin 13 should also be strapped to pin 5 to disable the AFC and definitely switch off the stored-station tuning voltage, but, as 405man said above, the better option by far is to fit the new CPU from Quad.
NB This thread should really be in 'Analogue Source'.
NB This thread should really be in 'Analogue Source'.
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