[TenTec] Argonaut 505

[JAMES T HANLON]

Y'all,

I just became a new owner of an Argonaut 505, the very first Argonaut and my first Ten Tec rig.  It came with the model 210 power supply.  I am noticing a 120 Hz hum on the transmitter note on CW and a corresponding hum on the SSB signal when I run the rig from the 210.  When I power it from a battery there is no hum.  It is most noticable on 40 meters which is where the local oscillator is tripling, and I don't see a hum on the wave-envelope with my HP1740A 100 mHz oscilloscope.  So it may be FM on the local oscillator.  

I would appreciate first of all a circuit diagram for the 210 power supply, and then of course any suggestions about what to do.  It is a really fun little rig when I run it from the battery.

Thanks,

Jim Hanlon, W8KGI