Rewire the filaments from 24 volt configuration to 12 volts.

You need +250 for plate voltage.

It's been 50+ years since I modified one, so I don't know the pin assignments.

/s/ DD



genev wrote:

I just got an ARC 5 receiver and wonder if anyone has any tips on modifying
it; I had one in the 1960's, but can't remember what I had to do to it. I
think I replaced the dynamoter plug with a modern one, but dont remember how
I put the tuning knob on the front.
Also, what voltages are needed?
Thanks in advance for any info.
Richard
K1TAV