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I currently own an older Miraphone tuba that I can't quite identify. It's a 5 valve Miraphone (spelled Mirafone on the tuba itself) Tuba that plays in the key of CC if you hold down the 5th thumb valve. Without the 5th valve depressed it plays in the key of Ab.

It also has three of engravings on it that I have found so far

Two of them says "R. Lockwood", with one being on the bottom strap hook and the other being on the bottom of the 2nd valve tuning slide.

The third engraving saids "CDL" and under it it reads "EQ329878".

The serial # is 10384.

Pictures:
http://imgur.com/pNQlyNH
http://imgur.com/QgUaQoP
http://imgur.com/2g6lBBF
http://imgur.com/coh03iV
http://imgur.com/uHsf1HO

Images work now.

186 5 valve CC Mirafone c. 1976 I believe....

How would I go about getting the 5th valve fixed?

HuffPuffTuba wrote:How would I go about getting the 5th valve fixed?

The thumb paddle for your 5th rotor doesn't look right. To fix the rotor rotation might be as easy to fix as flipping the paddle over so the spring is reversed.

As far as the model number goes... it's probably a 186 but if the bell doesn't measure 16 1/2" in diameter or a bit larger... it might be a 185 (15 1/2" bell) or a 184 (14 1/2" bell).

Emailing the serial number to Eva at Miraphone will get you a good answer regarding the key. The serial number is at the bottom of the triangle on the bell. The other numbers you mentioned are just personal ID numbers and don't pertain to the model.