[Premium-Rx] Rediffusion R500 Receiver

[Heinz Breuer]

Hello,
today I visited the estate of a silent key and saw a Rediffusion R500 shortwave receiver.

I powered it on and it seemed to work but there is no audio and the display says "muted". This receiver only has a keypad, no vfo knob. It seems that keys have more than one function. I would appreciate any help how to "unmute" it.
Is there any documentation available? Google found me nothing at all.

vy 73 Heinz DH2FA, KM5VT

Von meinem iPhone gesendet