"Arny Krueger" said:

Whatever it is, it is affecting both channels, per what you are saying.
Since fuses aren't blowing, the problem might be in the low-level input
circuitry rather than the outputs.

Haven't thought about that. Indeed would that probably rule out my
idea of a bias failure.
A power supply problem perhaps? I don't have a schematic of this amp
available right now.......

I see that a NAD 216 is going (or to be exact not going - zero bids) for
about $500 for eBay, so there is a possibility that your NAD 214 might be
worth a fairly expensive repair.

Agreed.

--
Sander de Waal
" SOA of a KT88? Sufficient. "