TubeNet

https://m.ebay.com/itm/Conn-36J-4-Valve ... SwdSRZ~ik1

Located near Pittsburgh. The seller was nice enough to meet up to let me play test it. Huge sound. Valves look worse than they are. The tuba plays flat overall with the main slide fully in.

I don't see anyone making any great claims for this one. One has to entertain some suspicion that one or more of the bidders doesn't have his head screwed on very tight, but that's the usual for ebay. As a battered 36J, I think one can be confident, it is what it is.