TubeNet

http://www.harborfreight.com/wireless-i ... 66550.html" target="_blank

Might be interesting to try. But... the key there is the diameter of the camera itself and whether it will fit down a leadpipe or up through the main slide tube. It's nice to be able to look directly into a port rather than across ports with a right-angle mirror.

The fiber optic borescope that I use has it's limitations on anything smaller than tubas or leadpipes that have much of a bend in them.

I own that very tool. I bought it to check valve alignment on a euphonium. Alas, the camera tip was too large to get around the tubing curves and so it couldn't see the valves at all. I haven't tried it on a tuba. It's a neat gadget...
-hald

No way that thing goes down a lead pipe. Note that the height of the monitor is 2.75", then compare the diameter of the camera tip, and it looks like it would be a tight fit in a smaller-bore horn (.689). Probably would work well on a large-bore rotary horn if you came in from the tuning slide end of the set.

This one would certainly work (smaller than a pencil eraser), but at $1245 bucks, you better be inspecting a lot of horns.

http://www.21best.com/21_best/electroni ... color.html

They have others: .5" amd .6", but still really expensive:

http://www.21best.com/21_best/electroni ... tml#icam30

TubaTinker wrote:the key there is the diameter of the camera itself and whether it will fit down a leadpipe or up through the main slide tube

Customer "product reviews" at the linked page state the following:

A) Diameter of the camera head is 18 mm (0.709"). Manufacturer of this camera makes a 9MM cable option for this camera but apparently it is not made available to HF.

B) Focus range is from about 8 inches to infinity.

Both would seem to present limitations for use in valve alignment applications. Head diameter too large, and focus range not short enough.