[Eric]

    I have this Parmak 1929  ( no documentation that I can find) I've been ignoring for quite a while and I'm finally getting around to working on it. I have it all cleaned up checked all the coils, tubes replaced the one cap that was  5mf and replaced the wires in the harness that were crumbling. I have no experience at all with battery sets but all of the leads were marked except one. Here is what I have.
A- Black   (goes to chassis) 
B+ power Blue   (goes to speaker)
B+90 Brown
B+ Det  Yellow
C-         Grey
C+ Green   ( goes to Chassis)
And one red lead which goes to one side of the heaters the heaters would this be A+?
Also don't see a B- ?

It looks as thought I will need 3 voltages?

A, B, and C  How would they be connected?
and at what voltages?
The tubes are 5v heaters 5-01A and 1-171
Any help would be greatly appreciated!

Eric