In article ,
Fred McKenzie wrote:
In article ,
"Antonio I0JX" wrote:

I believe that model 3117 cannot be readily converted to AC operation (e.g.
by removing the vibrator and feeding 6VAC o 12VAC into its socket), as the
transformer is sized for the vibrator frequency, that is about 120 Hz. At 50
or 60 Hz the transformer would presumably draw too high a current under no
load conditions.

It might be worth a try with 6 or 12 VAC. I'd go for 12.6 VAC with a 10
Amp fuse to start with for protection.

Take the output of your 6V transformer... put it into a bridge rectifier
and then a series electrolytic.... Voila! Very ugly 120 Hz waveform.
You can clean it up a little with a tuned 120 Hz tank circuit but you may not
even need that.

Antique Electronics Supply in Arizona sells solid state retrofit modules
to replace vibrators.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."