Mark Rehorst wrote:
My SX-190 has buzzed at a level just loud enough to be annoying since
I got it a couple years ago (minus a lot of time when it wasn't
working at all) even in standby. One of the things I did to the radio
is replace the electrolytic caps, including the main power supply
filter. I used the same 2200 uF the schematic called for, but the
buzz is still there. Does anyone with one of these radios have a real
quiet set, or do they all buzz like this? Would putting caps across
the rectifiers reduce the buzz, or do I need to go to a quieter
external supply? Or should I do something to the audio amp?

If it is a buzz, it is probably not a cap. If it is a hum, it is probably
a cap. What stage is the buzz from? If you pull the mixer tube, does it
still buzz? If you pull the IF stages? What if you pull the detector?
At what stage is the buzz getting into the signal?

One more thing- where can I get a set of tuning tools that includes
the hex drivers for IF can slugs?

Cain Electronics in Hampton, VA still has TV tuning sets.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."