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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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lowrider57's avatar
lowrider57
5,417 posts
 
Interesting and valuable info.

The RCA red base is a 5692 which requires less voltage. But it's good to hear VAC is ok with running all versions of the 6SN7.

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vineland
7 posts
 
Hi, I just received a VAC 70/70 iii, and this thread is great!

I have a question:  could I drop the Psvane CV181 T Mark ii in as driver tubes?  I have a pair of these, and I'd love to hear how they sound in place of the EH currently in there.

I don't know if they're 6SN7A, 6SN7B or something else that is 6SN7 ish - I don't want to mess up the amp, since it just came back from service.

Thanks!
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