I am a tenor trombonist but want to teach Trombone at the University level and want to buy a bass bone so I can properly understand and teach the bass bone. I initially was going to buy a 70h because I have a couple gigs currently where I cover the bass bone book with my concert horn and since the charts are Frank Sinatra where GR played the bass part I wanted to get close as possible to that sound. But my friend pointed out something I agree with which is I should go for something with two triggers in the most common tuning so that I have the best chance to teach students what they are mostly working with. What are your thoughts on this and what has your experience been.

I'd definitely get something middle of the road, probably F/Gb/D so you can get the full experience, and are ready to teach all aspects of the horn.

Bb/F/Gb/D independent. Then you'll just have to condition yourself to "forget" the Gb options when teaching a student with a dependent horn. It's a whole lot easier that trying to teach the Gb options when you've never used them yourself.

If you're looking for something new, you might go with a yamaha <LINK_TEXT text="https://usa.yamaha.com/products/musical ... index.html">https://usa.yamaha.com/products/musical_instruments/winds/trombones/ybl-830/index.html</LINK_TEXT> Pretty standard.

A Getzen is pretty main stream: https://www.getzen.com/trombone/eternabass/1052fd.shtml

Some people like the Conns: <LINK_TEXT text="https://www.conn-selmer.com/en-us/instr ... bones/62hi">https://www.conn-selmer.com/en-us/instruments/band-instruments/trombones/62hi</LINK_TEXT>

If you want something used, Bachs can be decent horns, recommend the 50b3, several valve options. I personally play a Kanstul 1662i. Some people like the Holton 181.

Roberts played several horns, but mainly stuck to single valves. If you want a double valve that gets the Roberts vibe, but you'd still be best to look for a Kanstul, although a Kanstul is going to have some features that aren't really mainstream, and students won't necessarily recognize (like tuning in slide).

Your best bet would probably be a Bach 50b3 with your choice of valve (rotary, axial, Hagmann) or one of an assortment of Yamahas . You can get them new or used, although new Bachs in my opinion are a bit over priced. Recommend you play some before making a long term relationship with an instrument. The Yamaha would be the safest bet to buy sight unseen.

For a doubling horn, you really can't go wrong with a Yamaha, especially the discontinued 613H. I'm not as much a fan of the 830, and I think it's too bad they don't have another independent bass in their catalog.

The Shires Q series bass - and the Eastman bass for that matter - is excellent as well.

The Getzen 1052 is also worth a look.