[quote name='Big_Stu' post='1334025' date='Aug 9 2011, 07:19 PM']Am I missing something? I've been told my a few techs that it's not damaging until a load is put on the amp, & since there's no instrument lead plugged in then there is no load being applied?
I know virtually nothing about these things, just repeating what I was told?[/quote]
Won't make a difference, simple rule of thumb is you need a matched load on an all valve amp whether you have an instrument plugged in or not.