Alright, so I drew up a schematic and these were the features/specs I wanted to include:
Output Tubes: 2x KT150
Input Tube: 1x 6SN7
Power (out):~ 12.5W (SET) / 30W (UL) per channel - (switchable)
Gain: ~20 (+26db)
Outputs: 4 ohm, 8 ohm and 16 ohm speaker outputs and headphones outputs (1/4" and 4-pin balanced) - (also switchable)
Inputs: 3 RCA - switchable
Input Impedance: 50K ohms
Output Impedance: ~1-4 ohms (depending on output used. The headphone output is ~4 ohms and the tap for 4 ohm speakers is ~1ohm)
Frequency Response: greater than 20hz-20khz @ +/-1db
Volume: 24-stepped series attenuator (built-in-house)
Notes: No negative feedback used. Entirely Class A (or Class Eh?
I was thinking this could be used as a desktop amplifier because of the speaker and headphone outputs. It may have a lot of appeal to fans of mini maggies from magnepan, as well as owners of power hungry 'phones such as the HE-6, etc.
What I want to see is: 25w, triode-UL switch, 2000us max and Wolf Ear Audio build quality . 25w from KT150 SE is to be able to power real world loudspeaker with the sound of a single ended class A, but without the price of a 811/845 tubes.
Guesstimating the price based on what I currently pay for parts this would likely land under or near your 2000USD sell price with all these features. I would likely ship with all Tung-sol tubes as well.
I would love to make a product like this but would like to hear what you all think about it before committing to bringing such a project to life