When I was at school, I built a number of Mullard 5-10s for myself and friends. We're going into the winter, and I know I'm going to be bored, so I fancied recovering my lost youth (yeah, right!) by building one again.
So, today I bought this, sold as a GEC 912 amplifier, which was GEC's version of the 510. Same EL84 valves, different phase splitter, but same output transformer spec, so I can rebuild this as either a 5-10, or perhaps keep the circuit as a 912, but strip out all the tone controls and preamp and configure it as a pure power amp. Looking at the two circuit diagrams, a 912 as a pure power amp should have lower noise and distortion than the 5-10 as it doesn't use an EF86 as the first valve, but there probably won't be a lot in it.
It looks like a fairly decent home-build, but as it's likely to be getting on 60 years old, I'll first make sure it's safe before putting any power on it. At least whoever built it, did properly earth the case...
It'll be interesting to see how many of the 60 year old electrolytics are still usable. That'll make an interesting comment on those people who recap their amps because they're 10 years old...
Problem is that when I've finished the rebuild, I have no use for amp! Just nice to have. By the way, I've also bought a Quad II amp to restore as well, haven't received it yet, and no, I don't have a use for that either. My kids will love me when I'm dead and they have to clear out all this stuff.