The only people I heard of who rolled their tubes put the stock tubes back in pronto.
This is situation where I'd take the manufacturer at his word (and I normally hate stock 6922 Sovteks). Keith does voodoo with these things. It ain't worth the money to experiment. I know it sounds counter-intuitive to call a tubed preamp "plug 'n play", but that pretty well sums it up. The preamp isn't picky about cords either.
Leave 'em alone and enjoy this great preamp.
BTW, I have Alons too (Vs) and find the Herron gear synergistic with my speakers - I use Keith's amps as well.
This is situation where I'd take the manufacturer at his word (and I normally hate stock 6922 Sovteks). Keith does voodoo with these things. It ain't worth the money to experiment. I know it sounds counter-intuitive to call a tubed preamp "plug 'n play", but that pretty well sums it up. The preamp isn't picky about cords either.
Leave 'em alone and enjoy this great preamp.
BTW, I have Alons too (Vs) and find the Herron gear synergistic with my speakers - I use Keith's amps as well.