Grebe Synchrophase Seven

This is probably going to be the last restoration prior to the large project mentioned below.

GREBE SYNCHROPHASE SEVEN
Using five 201As  a 112A as a first audio and a 171 running at 180 volts, this is one of the LOUDEST battery radios that I have restored. It is also one of the least likely to be seen in operation due to the extensive use of pot-metal parts.

The inlayed brass escutcheon is worth having even if the rest of the radio is gone. This is another part that is often damaged.

In the spirit of the MU-1, the Seven drives the tuning caps in sync, eliminating 2 of the tuning knobs but adding 2 more stages for a total of 5. That is a lot of mass being driven by one knob.

And this is what the linkage looks like after it crumbles into small chunks. The pot metal has degraded to the strength of dried mud. It can easily be crumbled with your fingers. 

Above is a "reject" replacement part made of steel. Since the six linkage parts (5 on the caps and one pivot) must be the same length to have any hope of working, this one failed buy about a 1/16 of an inch. Keep in mind that the fine tuning turns a metal roller against the Bakelite main tuning knob - not much friction  - so even more need to be accurate.

Toner was custom mixed and applied with an airbrush.

It will take a few days to dry enough for reassembly. I'll add a finished picture then.