Thursday, 16 January 2014

The Morley Serge - Phaser & Reverb repairs

The Morley Serge has two early reverb and one phaser PCB.


The VC Phaser has three separate outputs : 1080 degree, 720 degree, and 360 degree of voltage controllable phase shift.
Here is the Phaser data sheet from the 70's
Ken Stone has a great explanation of this circuit here: 
Serge Phaser

The Reverb uses 2 spring tanks mounted together in the upper right compartment.
These were originally found to be magnetically cross-talking as each tank's pickup was too close to the other's drive coil.
Here is the Reverb data sheet from the 70's


Testing of phaser & reverb after repairs. (Ken Stone video):

"VCO to mixer.
Phaser out to mixer.
Mixer to reverb.
Reverb to phaser in.
Phaser modulated by second VCO".

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