[R-390] R-390 Grounding Question

[Flowertime01 at wmconnect.com]

Rich Baldwin


Yes, the R390 filters leak like the A filters do.

The third wire should go to the full metal chassis of the receiver.

My TM figure shows AC to Pins A and D.
Pin C is ground

Pin B is a DC line into the power supply.

There is another DC flavor power supply that goes in the R390.
With that power supply and a different power cord you can operate the
R390 off a 24 / 28 volt DC source.

That power supply made up high voltage DC via small motor generator.

That thing made lots of hash.

That's really why the R390's have the wonderful voltage regulators in the 
Audio deck.


Make sure Pin C has a good amp passcity to the frame if you are using a 
mating connector. There is no place in a ground circuit for a weak wire.

I hope you like your R390.

We expect yours is wired for 120. But you may want to look see
under the Power chassis. You may want to look at some 47 ohm resistors while
you are looking.

You can solid state the 26Z5's in the R390 power supply like its done in the 
R390/A.

Roger L. Ruszkowski AI4NI
   </HTML>