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VAC 70/70 mk3 tube rolling question

I recently purchased a VAC 70/70 mk3 s. Where can I find more information about the tubes diagram for the amp? I know it uses two 6sn7 per channel. Are there any differences in functionality between the two 6sn7 used for each channel? For example, do I need to use a matching pair of 6sn7 per channel?

I have one matched pair of RCA red base 6sn7 and a matched pair of Raytheon vt231 6sn7. The RCA are good for lush mids with 3d soundstage and Raytheon vt231are good for speed and accuracy.

They were meant to be used for the Schiit freya plus which uses a pair of 6sn7 for output stage and another pair of 6sn7 for voltage gain stage. Now since I already get a VAC renaissance 5 preamp, I am wondering if I can use my two pairs of 6sn7 on the VAC 70/70 amp.

My question is can I use one RCA + one Rayheon vt231 for each channel of the VAC? Or should I use a matched pair of 6sn7 for each channel? What are the recommended settings?

Also, any experiences about tube rolling on the VAC 70/70 mk3 are welcome. Like which 300B amps or 6sn7 combinations give you the best results.
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jjss49's avatar
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jjss49
6,612 posts
 
over the years i have found kevin hayes to be approachable, welcoming and very helpful in all inquiries regarding his gear

one of the really good guys in the biz, and makes lovely (if pricey) gear
roxy54's avatar
roxy54
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Almarg, where are you?
lowrider57's avatar
lowrider57
5,417 posts
 
@roxy54 
Almarg is no longer a tube guy, no more VAC. Can you believe it?
Of course, his wisdom is always welcome.
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roxy54's avatar
roxy54
8,007 posts
 
That is not good news Tvad. He's a great contributor and a good man. I truly hope that he will be well soon. I realize now that I haven't seen any posts from him lately.

Lowrider57,
I was aware that he no longer had his VAC, but I also knew that he would be a wealth of good information about it.
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