How do tube manufacturers like VAC get 55 watts per KT88 where others get only 30-35?

Thanks Charles and jond:  I will be driving KEF Ref 3 loudspeakers. My preamplifier is VAC Ren 5 and my room is very modest at 14 x 16 ft.  I'm tempted to go Zesto Bia 120, albeit less power, as class A and running tubes conservatively sounds enticing.  However I know VAC is synonymous with great sound. I owned a VAC Phi 70 a decade ago but that was a much different 300B beast.  Both the VAC Signature 200 IQ and Zesto Bia 120 have transformer coupled balanced inputs.  Thanks!

@normie57, I heard Kevin announced a VAC Ren 5 SE upgrade.  If anything like my SigMKIIa SE upgrade, Jump at it now!!!  Call Kevin ASAP!!! ... (Sorry, ebm took my keyboard).   Improvements are staggering in all areas.

I highly recommend the VAC Sig 200 IQ.   It's probably one of the most owner friendly tube amps.  Auto bias, if power tube arc, IQ trips and just replace the tube.   You can roll KT88, KT120 or KT150 if need more power or linear sound.   For even more power, buy a 2nd run in mono.   But most importantly is VAC SQ has improved, more transparency, lower noise ...

Now that's REAL creative and outside-the-box thinking!  Not just a bunch of Blab Blab ... look at me, I'm the best ... hot air.

Thanks knghifi!
I appreciate your recommendations on the the Sig 200 IQ and the Ren V SE upgrade.
You are so right. VAC is a proven winner for two decades and Kevin is great to work with!  Why stray?

Hi all !
Class A, AB etc. But I also noticed that there are output transformerless KT88 systems. I believe its a so called cathodefollower?.
Then again comparisons with SS amps is difficult.... Tube amps are voltage related instead of SS which are current related.
Another thing.... output transformers have a specific habit. So quality of these is realy important and will take a prominent place in the pricetag..
But most important: the fun you get from your equipment!
regards
Ton

I would still love to know how VAC gets 100 watts per pair of KT88s without tube reliability issues or distortion. Probably some proprietary secrets, the intelligent auto bias,  as well as huge power supplies to comfortably generate the needed plate voltages.  I have heard Kevin use The Signature 200 IQ in monoblock configuration at a couple of shows and the sound was memorable.  I'll place an order and give them a spin in stereo first.  I would also love to hear from Zesto amplifier owners, either the Bia 120 or Eros 300.  Thanks so much!