Can a broken leg from a tube be soldered and used?

I once purchased matched pairs of 6C33Cs from BAT for use in my Atma-sphere amps. You might check with Victor Khomenko, if you live in the US. Any extra cost was well worth it, since the first set of tubes have lasted nearly 10 years with no failures and all still bias well. As to the repair job, yes I think it could be repaired and a proper solder joint is not going to break off in the socket. The bigger hazard is that heat from the solder gun could cause a fragile internal wire to go up in smoke, causing a short. I would opt to throw that tube away.

Dear Ihcho, It was several years ago that I bought the 6C33Cs from Victor. I bought two sets of six matched pairs each. At that time, I think Victor had the inside rail to obtain tubes that had been built in the Ulyanov factory in the early 90s. Those are said to be the best run of 6C33Cs. I either paid $80 per matched pair (i.e., $40 per tube) or $100 per matched pair. I really think it was the former amount. But bear in mind that this transaction might have taken place as long as 10 years ago. Anyway, since you have a BAT amp, they should give you some sort of deal, but it would have to be based on current values. You have a high-end amplifier; why compromise on the output tubes? They will last a long time.

Newbee makes a good point. But you do have to feel confident you have a firm contact that won't short out during use. Also, as I recall the ceramic sockets for the 6C33C are fairly thick before you reach the metal contact points, which places a constraint on how short the pins can be and still achieve reliable contact.

Dangerous to just take a chance that the missing leg is irrelevant. In fact, as far as I know, there is NO irrelevant pin on a 6C33C. Anyone who told you that is "blowing smoke". Here is the pin diagram URL. I believe pin 4 is the single large diameter one, so you can use that for reference:

http://www.audiomatica.com/tubes/6c33c.htm

By the way, pin 4 is the single "plate" connection. Pin 5 connects to both grids, and pin 3 connects to both cathodes. Despite the presence of dual grids and cathodes, this is not a dual section tube, because it has only one plate. The other pins in pairs subserve the filament connections. If you light only one filament (by omitting a single filament connection), then the tube is reduced in its ability to handle current, at the very least. Also, these tubes are not internally fused, so if they are overloaded they will arc.