How many el 34 tubes do you have?I’ve been using the Aqua 274B in a TRP for some time and also in a just departed Supratek preamp. I also have an upgraded GG2/3 coming with one that I look forward to. I had been recommending it to Supratek users over on Agon and all have found it worthy. The Aqua is also often available at discount under the Specials tab at the Sophia’s site. My only regret is not having tried it much earlier in my tube search.
There’s been mention here of Sophia`s excellent EL34-ST. In the TRP, I ended up preferring their KT88-ST. Better synergy for my tastes. If anyone is interested in my EL34’s (grade A), which have well less than 1000 hours on them — and the Lampi is easy on tubes — feel free to PM.