@noromance Thanks for the reply.
With some thought the Braun amplifier seems like a hassle with the interface.
The Unison Research Simply Italy is the perfect amplifier, but it’s 2500€.
On the used market in my area I found a Unison Research S2K for 1250€. It seems a bit pricey. But it’s as good as it gets for a low-powered SET amp. It uses KT88 and ECC82 tubes. I trust this brand a lot.
Otherwise, there are Douk Audio amps from China for 400€ (is it any good?).
Some guy in Italy on Catawiki is selling a custom EL34 amplifier for less than 300€ but I have to bid and I am worried about a hum. I got scammed with a custom tube amplifier for 1800€ which hummed like an A/C unit in the past.