What is the DC current requirement of your radio (i.e. 500mA)? A very simple
supply can be made up of a common 9V walwart with some additional
components. Just open the walwart and add a 7805 regulator, a couple of
diodes (do increase the 7805's voltage to 6V), and a couple of caps.
Actually, it is possible to improve on the radio's built-in supply by adding
this circuit to it.

Let me know if you'd like instructions.

Noel
"author" wrote in message
news:01c3d31c$aa2c97a0$53c44a43@gwg1...
The power supply in my radio has audible hum in the background
and bypassing the diode rectifiers with capacitors does not eliminate the
hum. There is no hum when using battery power. The solution is to
build my own power supply. Does anyone have a design for a compact 6V
supply that I could build for this purpose?