LED's replaced with
modern low profile diffused brightness LED's. Old style LED's tend to
crack the plastic panel cover as they touch the surface. An original LED
is held up for comparison.
Power Supply (PSU)
board. All four capacitors replaced. Modern types are smaller (as can
be seen). This unit has a Moog PSU rather than the previous Faratron that
caused overheating!
Mods (Factory
Modifications)
Throughout the
Polymoog's production run, Moog issued Service Departments with various
Mods to correct various technical issues.
During this restoration
Colin carried out all the Mods that were outstanding.
Keyboard
restored and
rebushed (believe me, it plays like a dream and the keys are perfectly
level). Each key is filled with an epoxy resin and lead shot mix and have
a lovely weighted feel with very fast response and recovery. Most Techs
avoid working on the keys as they are very labour intensive. If you can
though, have it done. The Polymoog keys once restored are wonderful.
A factory mod was
required on the TL Board. This involved cutting the track and bridging
it with 2 resistors to prevent jitter in the phase lock loop.
Another mod to the
TL board, once again the track was cut and bridged with 2 resistors to
correct temperature stabilisation of pitch.
This
Polymoog strangely, had a Rev 1 AND a Rev 2 HFO board. This required modding
the Rev 1 board to Rev 2 as well so that they matched. The first image
shows the underside of the Rev 1 board modded and the second picture shows
the Rev 2 as is.
The modded Rev 1
HFO board (top view).
The
top of the Rev 2 HFO board as is.
A mod
to the TL board to prevent pitch controller leakage.
The
next two images show the final re-assembly of the Polymoog after all the
restorations were completed.