NOS tube alternatives for Herron VTSP 3A r02

Any owner with info on a VTSP 3a tube position/function?

What do V1 left channel/V4 corresponding rt channel, V2 left/V5 rt, , V3 left/V6 rt channel -  subserve? Which ones need to be matched?
Does this amp need quad matching or just in pairs?

I've found that the right alternative tubes can improve an amp better than moving to the next model up. 

I should add that for a much lower cost you could try Amperex 6DJ8s. Not as long lived but similar in terms of sound. Could call Keith to see what he thinks about 6DJ8s.

Call Keith to find out which tube pairs are the most critical and then roll these. My favorite have always been the Amperex U.S. or Dutch made 6922s. 

Calling it "voiced" carries the unfortunate implication of looking for a particular characteristic sound. Which is unfortunate since the main thing the VTPH2A hit me with is its lack of voice or character. It made the previous ARC sound downright woody and colored. 

Given the history, used gear, tube rolling, I'm not at all surprised you played around and found something better. What would surprise me is if you called Keith and didn't find whatever he sends you at least as good.

Who cares about mileage, really? Its the road. The car. And most of all the driver.

     After 6 months of listening with the stock EH tubes, switched in 2 Siemens  Cca and 4 Philips E188cc ( didn´t have 6 of a kind) and the results were purely positive.

     Totally gone was any hint of electronic haze or the glare & brightness in the upper mids I find so offensive and characteristic with Russian & Chinese current production. Voices, especially female much more natural, soundstage opened up and best of all zero listening fatigue over very extended periods. Plainly, just much more musical.

     Advice about not messing with stock tubes from manufacturer and other content users seemed mainly based upon the argument that the preamp was voiced with provided tubes but it´s obvious that my setup ( Air Tight PC1s, SME IV, Avid Volvere, Zanden 1200 mkII, Reimyo CDP 777, CAT JL5, ATC SCM19v2, Audience SX & Harmonix speaker & interconnects, Cardas Golden Reference & Clear Beyond power) cannot be the same @ Herrons or any other where this particular piece is used.

     Anyway, cheers and remember YMMV.

Buy the "NOS" and the Herron set, as you outlined above, and listen and compare. It'll be fun and it's what you need to do. 

Do what Keith says and tweak something else in your system if you need to scratch that itch.

Keith told me he goes through something like 10 tubes that don't make the cut for each one he uses. This is after having selected the best tube type. This is just comparing the same tubes for quality and matching. He told me he has a barrel full of rejects. Which people are always asking to buy, because even some of his rejects are better than 95% of what they would otherwise get just rolling the dice on the market.

Which come to think of it, is what it should be called. Not tube rolling. Rolling the dice.

Or just buy tubes from Keith. 

(The more you talk to Keith the more amazed you are at what a stone bargain his stuff is. As if the sound alone wasn't enough...)

Thanks for your input jmolsberg .
Coinincidentally it is precisley the Dutch  E188CC / 7308 Amperex I´m most incinled to try. Will most likely contact Herron for a set of theirs and compare. Should Herrons prove superior can always  use the NOS in other components.
Since there are 6 of them in the VTSP I´m wondering if I´ll need a matched sextet or 1 matched quartet + 1 matched pair or 3 matched pairs.

I do not own the VTSP but I do own the Herron VTPH-2A pre and experimented with some pricey NOS tubes. Quickly came to the realization I much prefer the new production vacuum tubes Keith provides. With that said, my favorite 6922 is the amperex 7308 and I'd bet it will sound damn good. You might save yourself some coin by going with Keith's recommendation?