Interesting speakers as I looked @ them maybe 10 years ago, if it’s the same speaker (think around $1K/pair @ the time).
Anyway, as an affordable experiment I still hold with the Orange Globes (which are ready to buy from a reputable dealer well within your price range).
However, Brent may have other/better options if you email/contact him.
Never done business with Brent Jesse and just going by feedback from those who have.
Not keen on Kevin Deal, but this goes way back and it is of a personal nature (I have never purchased tubes from him, but attempted to purchase WE 300B’s years ago).
The Voskhod (rocket) tubes rec’d have been pretty much unattainable for the past 10 years (decent testing low noise versions), but if you can find a suitable pair you may like them.
The Mullard’s I used/enjoyed were later production 6dj8’s dimpled disc getter’s from Blackburn (I think) and dimpled disc getter ECC88’s from the Mitchum (sp?) plant.
They were saturated rich/creamy with somewhat loose bass and somewhat rolled off HF’s (awesome organic musical tubes in my gear).
Think I still have a pair of 1964 Amperex Hicksville 7308's as well as a sleeve of ecc88's (Japan), but not certain if I have any pairs of the tubes I used most (can't access them now anyway as they are buried).
DeKay