Did you read in Karl Lozier's review at www.enjoythemusic.com why Keith said he didn't encourage swapping the stock tubes? It seems like a pretty valid reason.
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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.
I was tempted as well in trying other 6922s on my 3 months old VTSP-2 but so far with the factory fitted tubes it just sound so right.
Being a "Tweaker" I could not resist tweaking all of the Herron's 6 tubes with Herbie's Hal-0s. I can now hear more details & less sibilance particularly on female voices with the "tweaked" Herron. The Hal-0s is a must audition......
I had one and it is a FINE, FINE piece. Tried rolling, too. High-end Teles, Seimens, etc. etc. The only quad I found that sounded any better than the stock tubes was a quad of Rathyeon-badged tubes that I believe were US Amperex. Ipy's suggestion of the stock tubes with Hal-O's are just what I settled on. And happily. If I had not gone to a passive linestage, I'd no doubt still have the Herron.