Thanks so much for your reply. I am sorry but I need the VAC. I am triamping my system with SS on the bass and tubes on the mid and treble. I have VAC for one side but need one for the other. I have another VAC in storage but it is not a Mk III signature. The good news is that Kevin can still upgrade it. However if I can buy a signature and sell the one in storage it would be cheaper and less of a hassle.