Look like a single channel (mono) PA Amplifier. Uses a 100V speaker line. My valve theory though is very very very minimal as I did my apprenticeship just after valve technology was looking old.
heheeh yes I do. 811 triodes were nicknamed "milk bottles". You don't want to screw up with them, the output voltages will kill. They're usually found in high end valve amps, usually single ended, quite often with 300b valves driving them. One of the most famous amps, Ongaku uses 811s from memory...
Thinking back, the number of valve televisions and radios I used to scrap in the 1980's was bordering on criminal. They were masterpieces but many were uneconomical to repair (from the point of view of the owners), and many of them never returned to collect them from our workshop. We literally ended up collecting hundreds of them.
I know they would be obsolete wuith current digital broadcasting, but when I got one repaired and glowing, I would stare at them for what seems like hours.
So sad valve technology is almost extinct, except for the niche markets, such as guiter amps.
Breadboards and pinboards are great .... no soldering required.
I've not done a huge amount of soldering (electronic varierty that is) and my soldering on circuitboards is pretty ordinary and rough .... good soldering comes with heaps of practice , I need more of that.
By all accounts it's a superb headphone unit (and utterly gorgeous). If I was filthy rich, I'd probably justify buying one. Until then, I'll stick to my 20 year old Sennheiser HD540 II gold references (limited numbers).
