300B or 2a3 SET Class A for Heretic Model A?

@yaluaka I am very focused on the sound; if its right then the music is processed by the limbic portions of the brain which increases body movement and emotional response. Increased engagement.

I run a recording studio as well as manufacture amps and preamps. When the system is accurate it is also musical and engaging. IOW 'accurate' and 'musical' are not two different things. They are the same thing.

If you think otherwise it is because you've only encountered equipment that was claimed to be 'accurate' but was not (and was amusical; far too much of that out there) similarly the 'musical' equipment you've heard apparently was not as musical as is possible because it could not also be true to the music (accurate) at the same time.

Now I get that you can use R2R tape to warm up a digital recording (because it adds a 3rd harmonic) or run it through a single-ended tube circuit to add a 2nd harmonic; I understand how distortion affects our perception of musical (keeping in mind that understanding that is important for the design side of my work).

What I'm saying here is the distortion signature of any amp is paramount to how it sounds- the distortion signature is its sonic signature. So obviously the distortion signature must be as benign as possible (lower ordered harmonics dominant as seen in an SET or our class D or our OTLs) but also as low as possible so the equipment can reproduce low level detail properly.

Amazing community this is!

Sorry for late reply, dunno why gmail put all in the SPAM.

First of all, thanks to U for the kind responses, I have been checking your proposal and also did my own research and would like to add few mores:

Acoustic Plan Aruna 300B.

El Mago 300B.

Audion Silver Knight 300B (many options not clear to me).

Uchida A23 

Allnic T-1500 MKII (sounds like a classical SET or more “modern”?).

Also very intrigued by PX25, what kind of sound and power delivers?

Due to the good impedance and DB of my new speakers, how would compare a proper SET 300B Class A to small EL84/34 based tube integrated such as Leben CS-300Xs, Luxman SQ-N150, Mastersound Dueundici, etc.

One which I loved in my researching was Thöress brand, with a F2a11… never bearded bout this tubes.

Pretty interesting that Elekit and cheap! Would be up to the task in the magic the other can deliver? Sunaudio is the same concept?

Cheers!

Due to the good impedance and DB of my new speakers, how would compare a proper SET 300B Class A to small EL84/34 based tube integrated such as Leben CS-300Xs, Luxman SQ-N150, Mastersound Dueundici, etc.

@superelmar That will depend on how well the designers understand how distortion affects what we perceive. You'll have to try them and see. But if the EL84 amp is properly designed and built then I would not expect a downside compared to an SET. The tricky bit is if you mix single-ended circuits with PP in an amplifier, you get some distortions (in particular the 5th harmonic) which I have no doubt is part of the reason SET advocates are so staunchly loyal to their SETs.

That can be avoided by insuring that the PP design is fully balanced from input to output. In this way the 5th harmonic enhancement is avoided so the amp sounds smoother and more involving. Fully balanced PP amps are rare FWIW as so many 'designers' simply use legacy circuits from 1950s textbooks or prior designs, so have the same flaws baked in.  To keep the playing field level the PP amp should also be class A.