Michael Black wrote in e.net:
On Mon, 31 May 2010, HeyReub wrote:


I just bought a used ts-820 which had been completely reconditioned and
has all new tubes. It works great in SSB but when I insert the CW key
and put the Mode sw in CW, I get a constant tone that none of the dials
on the front seem to effect. When I remove the jack, the tone goes
away. Any suggestions?

Have you looked at the key? Some have a lever that allows for closing
the contacts on a continuous basis, such as when tuning up. See if there
is, and that it's not closed.

Or, it may be a short at the plug.

Or it may be a 2-conductor plug on a radio which requires a 3-conductor
plug. I know my Yaesu FT-857D, FT-897D, and FT-920 require 3-conductor
plugs, and if I insert a 2-conductor plug, it will put the radio into
transmit RIGHT THEN.

Check the manual and the plug type first. If the plug type is OK, then
ohm out the plug. If it's not shorted and it's the right type, then
something interesting is going on.

--
Mike Andrews, W5EGO

Tired old sysadmin