The basic tube of each tube type you have may be worth pricing
to see if you can try a new set of one or the other or a set of both. Did you reverse left/right with both the 5881's and
the 6SN7's. If you bought the unit new, I would obviously
contact the dealer. If not, you may want to get your hands on
a set of maybe the 6SN7's and try them first. However, you may
be surprised at the customer service certain companies may
offer even if it is used. IMO, it can only benefit them and
would certainly boost their reputation at the very least.
to see if you can try a new set of one or the other or a set of both. Did you reverse left/right with both the 5881's and
the 6SN7's. If you bought the unit new, I would obviously
contact the dealer. If not, you may want to get your hands on
a set of maybe the 6SN7's and try them first. However, you may
be surprised at the customer service certain companies may
offer even if it is used. IMO, it can only benefit them and
would certainly boost their reputation at the very least.