Dear LFers,

I have just acquired a Wandel & Golterman SPM-3, but it seems a bit deaf.
The wide-band setting works OK, but the "Selective" channel can't be
calibrated, and is 15 dB low in gain. Looks like a popped front-end or a
damaged input circuit. I've opened up the case, but all the innards are in
screened metal boxes.

Is this a common fault with this unit, and does anyone have experience of
this fault? (and managed to fix it!)

73, Dave G3WCB IO91RM