Hi Ras, If you want tone controls you could start by looking at vintage Leak (Varislope 2 preamp) or Armstrong amplifiers or receivers.
Hi Alan, I have question touching my next journey in hifi. Never tried valve amps, so I hope you could help with your huge experience. The problem is I need tone controls and I don’t want to spend fortune. Also I am a bit spoilt by my standards I don’t want something mediocre not showing what valves can do. I know, hard task. But to start somewhere I am looking for some solution, many ideas, but without help impossible. I could start with preamp only, as example. Or try to convert/refurbish/repair an old good design amp or so. Would you be able to help with some advices? Thank you Ras