PARALLEL-TRACKING TURNTABLE

HEAD AMPLIFIER AND SERVO CONTROL 

SPEED CONTROL

MODIFICATIONS TO SONY PS-LX 20 TURNTABLE
TO GIVE VARIABLE SPEED FROM 25 TO 120 RPM
USING A 10-TURN POTENTIOMETER AND 'CYCLOMETER' TYPE DIAL

EQUALISER BLOCK DIAGRAM

 EQUALISER GIVES RIAA IN STEREO
OR
VARIABLE EQUALISATION IN MONO
FROM EITHER LATERALLY OR VERTICALLY-MODULATED RECORDINGS

OUTPUT STAGES

HEADPHONE OUTPUT BOARD

POWER SUPPLY