Nait 2 no sound

[Richard.Dane]

Take a look here at this recent thread about a NAIT 2 with similar symptoms. In particular note the post from @NeilS

Nait 2 amp not working

One of the first points of failure due to old age with these, is that the capacitor in the switch on mute circuit no longer charges to a high enough voltage to switch the output relay on. I suspect this may be the case here. Regards Neil.