Hilde45:
My long term experience is with an Audion Silver Night DH/SET 300B amp and my currently owned/early DH/SET 2A3 Bottlehead kits.
I’ve also tried (@ home) an early "single ended" Decware amp (EL84/6922 I think), an Audion "single ended" EL34 based amp and a few vintage "single ended" EL84 based amps (Magnavox and one "stamped" RCA that may have been of Japanese manufacture).
If you want to try single ended (not DH/SET) cheap look into the current model SE Coincident EL34 based integrated amp.
Good reviews, less expensive tubes (even for really good ones) and there’s a used one for sale a 30 minute drive from Denver (you know the place).
I’m not familiar with contemporary Bottlehead (my amps are 20+ years old), but the reviews are good.
I’ve looked into Elekit and would go with the better Lundahl (sp?) OT upgrade, but I’m not certain if they have PT’s for 115AC as most listed are for 100 (the vendor in Canada could answer this).
Anyway, try it is my rec as I’ve enjoyed my meager DH/SET setup (no highs/tweeters - no lows/woofers) for the past 20+ years.
PS:
On the really cheap (just single ended/not DH/SET) Musical Paradise has a little integrated SE amp for $500, or so.
I would buy it from the local vendor (think he’s in Canada).
DeKay