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On german ebay there is an interesting tuba for sale. The text says it is an C/F-tuba from around 1950-1960.
Here is the link: http://cgi.ebay.de/ws/eBayISAPI.dll?Vie ... 0301581904
I'm not going to bid on it, since i only play Bb-Tuba. But the pictures show a very interesting "double-rotary-valve-construction". I can't imagine how that works.

Can anyone explain it?

the idea is simple: it works like a double french horn: in the leadpipe there is a valve that selects between C or F tubing, and after that valve there are 2 tuba-tubings that end in the same bell (like in a double french horn).

Thank you for the explanation! But, do you mean, the complete tubing of all 4 valves is double, with valve slides and all? Otherwise, intonation would be quite bad, wouldn't it?

KHHS wrote:Thank you for the explanation! But, do you mean, the complete tubing of all 4 valves is double, with valve slides and all? Otherwise, intonation would be quite bad, wouldn't it?

Yes. Every valve has two sets of slides. This is a compensating double, in that the extra tubing is added after the change valve is depressed. I would not worry about this as being a "usable" instrument.

Certainly very interesting! It must be very heavy for its size with the two sets of tubing?

Translation from the ad-AND I was told by the Alex factory that the 'floral' screws on the rotors you see on old Alex's dates them from WW II and before--I have always thought that to be incorrect since I thought they used them into the 1950's, but this is what the factory says-FWIW
Regards-
mark
jonestuba@juno.com" target="_blank

Offer a used and well received C/F - Tuba of the manufacturer Gebr. Alexander Mainz inclusive. Carrying belt, mouthpiece and suit-case The tuba was still played until last year. All courses and valves run easily. After consultation with the manufacturer the tuba must have been built between 1950 - 1960 and is for your age in a good condition. 4 +1 turning valves Sound approx. Ø 370 mm Length 970 mm German silver ring at the Schallstück Unfortunately we do not have in our association anybody that the instrument further to play would like. The tuba has some customs traces by its age already. Among other things also dents and scratches. Also the lacquer is no longer beautiful in many places. The sound is nevertheless impressing full. If necessary I send gladly further detail pictures by mail. I am not a professional, me will however endeavor all questions so well it go answering. Collection is naturally also possible. Article location is Buchholz in the north heath. Pictures are always original of the offered article. Questions to the offered article ask by mail. Dispatch and indicated forwarding expenses only within Germany (without islands). The buyer carries forwarding expenses. Much success when offering! Note: Offer please only if real interest to buy is present. A requirement delivery is binding on the conditions specified here. The Höchstbieter commits itself to the immediate payment and decrease. Immediate Vorkasse by transfer or cash payment during collection (euro) is agreed upon. It is a private sale of a private person. No commercial purposes, no calculation. According to European Union a two-year warranty is valid for laws also for private sales, if this is not expressly excluded. This happens hereby! They are not a right of revocation and no right to a warranty claim as well as no return right for the articles purchased by auction by you (see also BGB §312d paragraph 4 Nr.5). This is valid also for auctions with Sofortkauf was terminated. Warranty, cancelling, Rückerstattungen, complaint, reduction, exchange, guarantee, Inzahlungnahme, repair, Nachverhandlung, adhesion, etc. are fundamental and in each form impossible. Bidders do in this connection without demand your genuine, consumer protection laws, BGB, etc. The dispatch takes place after receipt of payment of the Ersteigerungspreises plus forwarding expenses. The Ersteigerer/buyer the risk of the dispatch and the risk of higher force carries. It is considered the usual retention of title up to the complete payment as agreed upon. If I - despite reminder over Ebay - should not have received 10 days after auction end a complete payment, I reserve myself the right to sell the commodity otherwise and payment of damages, stall money, to require etc. from the Ersteigerer/buyer to. With the delivery of a requirement the managing conditions are recognized obligatorily and without reservation. Parents are responsible for your children.

On double tubas, one side is usually not very good and the other side is unplayable.