[R-390] The ground round

[Bob Camp]

Hi,

Surprisingly this does get back to the R-390. The world is an odd place :)

One thing that is fairly common is for the bypass capacitors in the line
filter to go out. Generally they get leaky. I don't think I have ever
bothered to check the bypass cap on the neutral side of the line filter for
leakage. If it's leaky and your neutral starts bouncing around odd things
might happen. This would be especially true if somebody got the black and
white wires mixed up on your wall plug. Truth in advertising - I have
actually seen such a plug :)

Checking the line filter thing is easy. Just plug in the radio and  un
ground it. Then check for 60 volts AC on the chassis. If you get 0 volts or
120 volts then one or the other of the bypass capacitors is shot. Probably
something I need to start doing. Might be a good idea to go wire that wall
plug the right way as well .....


    Take Care!

            Bob Camp
            KB8TQ