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It all boils down to the three fundamental truths:
1) Try before you buy;
2) If you can't, buy from someone with a good reputation;
3) If it looks too good to be true, it probably is.

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tubashaman2 wrote:Ask them something only a real seller/musician would know, like how is the 5th partial and what notes do you have to use alternate fingerings on.
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Few real sellers or musicians would honestly answer those questions. Typically when asked questions about tuba intonation, sellers of tubas give BS answers.