I'm able to do Audio circuits UPGRADES with new "audiophile grade" caps on audio patch and power supply, low noise transistors, internal wiring with hi quality cables. On request enhanced machines for replay only (direct signal patch from heads to preamp output bypassing every switch) and every tweak you want.
Picture below shows Revox B77 output board before and after upgrade. Obviously the sound is more fine compare to which one given by the fairly good old oem components.

Printed circuit board upgrade

RCA pin output and wiring upgrade

Due to many requests from people asking for "magnetic stuff" and the big trouble to find some of these items nowadays I have decided to supply most usual consumer items and some unusual accessories and spare parts.

Sometimes you can find in this page fully restored, aligned and under warranty reel to reel for sale.