I'd send an email to Audiogon member "Raquel". He is quite knowledgeable about VAC amps, tubes, and particularly the amps you own.
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Thanks, guys. Good point, for sure. My initial thinking was that I've got quite a bit of gear and cable burn-in time ahead of me, and if I could burn in a set of tubes simultaneously to have something to compare against afterwards, all the better. Also, I was thinking that it could potentially take a few months to find a NOS matched quad from a reputable source if what I'm looking for is a bit rare, so I'd have a head start.
But yes, your point is well taken and there is certainly all the benefit in the world to spend some time with the system and observe performance across a wide range of musical content.
Touch base with Andy Bauman/Vintage Tube Services Or Brendon at Tube World.
If Andy has what you need,he will take back those that are well cared for and not abused (refund).But please discuss this subject with him.The initial outlay could be rather sizeable,but you have them handy to interchange.Keep your preferance and return the others.
I have a Ren 30/30 Signature as well, my favorite amp that I have owned so far. I actually like it better than a Phi 300.1 that I briefly owned, if that seems possible. The 30/30 has got a very satisfying, 3D and musical sound coming from the 300B/6SN7 combination and whatever Renaissance circuitry that makes them work.
I actually like the stock tube combination, overall quite musical and holographic sound. Overall the stock combo is not very easy to beat and is the most worthwhile set of tubes for the money.
However, after tweaking around, I now have a combination instead of Sophia Electric carbon plate 300B with Tung Sol round plate and Sylvania 6SN7W metal bases. This combo is more neutral sounding, dynamic and cleans up the sound while still sounding very musical. The difference to me is very easily heard. However I probably spent well over 1500 for this tube combo, so you would have to decide if it's worth it or not. Also my Chinese tubes were probably closer matched and therefore quieter with no music playing/preamp muted, but can't tell when actually listening to anything.
I've also tried a set of newly available Sophia Electric 6SN7 tubes. They appear to be very well built and sound pretty good, just not as good as the best NOS.
Also I have some of the Russian 6H8C purchased for another component, but these are not the 1578 type with round holes. If you search on this, more than a few people say the real 1578 are distinctly superior. I have never heard the 1578, but the ones I have I felt were nothing special as far as sound compared to Sylvania or Tung Sol.
I agree with Tvad...I have owned 4 different VAC 30/30 amps over the last 12 years all the way up to the Phi 30/30, and have rolled a lot of tubes in them all. I certainly heard differences between them, but none were clearly better than others...just different. Kevin and his crew have spent years voicing these amps around the stock tubes, and I have always gone back to them in the long run. Save your money or spend it on something else in your system. Stick with the stock ones!