The TB300 is a real Bach student trombone, and an older one. Conn-Selmer's parts catalog calls it the old, Elkhart-made Bach TB300, and Bach's own 2004 catalog page lays out the spec. It's a straight B-flat tenor with no F attachment, a 0.500-inch medium bore and an 8-inch two-piece yellow brass bell. The inner slide is chrome-plated nickel silver and the outer slide is brass, with a removable balance weight. New, it came with a Vincent Bach mouthpiece and a double-wall case. The TB301 that followed kept the same bore and bell, and Bach's current student trombones carry BTB numbers. That makes the TB300 a simple, sturdy horn for a beginner, if the slide is good. A trombone slide is two long, thin tubes that have to stay straight and parallel. Yamaha says a bend of a fraction of a millimeter over the length of the slide is enough to ruin the action, and slides dent easily. Spend your attention on the slide. Lacquer wear, a worn case and a missing mouthpiece are easy to live with.
A sensible first trombone for a middle-school beginner, since it's the straight tenor most band programs start on. Make sure the slide glides with no sticky spots, because that matters more than the finish.
Build and caseTB300
Bach doesn't publish serial dates for student trombones, and BachLoyalist notes that letter-prefixed Bach serials aren't on its Stradivarius list. Conn-Selmer's parts catalog describes the TB300 as the old Elkhart-made student trombone, so any TB300 is an older horn.
Bent or dented hand slides are the big one, since the tubes must be straight and parallel to glide. Conn's old care leaflet adds that a steel cleaning rod can bend a slide, and Yamaha notes that water key corks go soft and need replacing.
More on this in our trombone buying guide.
Buying guide
Only 7 TB300s are for sale and just 4 have fixed prices, so the $230–480 band isn't a market read. We'd buy the US one titled with a case at $206 delivered and add a mouthpiece, since its title says the mouthpiece is missing. The slide is what matters on any trombone, so ask for a video of it gliding the full length with no sticky spots, look along both tubes in the photos for dents, and budget for a shop check-up. Skip the $937 one from a Japan dealer, about 3.4 times the median, and treat the Needs Help and as-is listings as repair projects.
$106.00est. delivered
Titled in playing condition and shown in its case, and at $106 delivered with 11 bids it's the lowest price on a working one for now. We'd stop at about $206 delivered, what the Buy It Now with a case asks, and no mouthpiece is titled.
BACH TB300 TROMBONE IN PLAYING CONDITION G33001
$205.62est. delivered
A TB300 with its case at $206 delivered, under the band. The title says the mouthpiece is missing, so add a Bach mouthpiece and ask for a video of the slide moving.
Bach TB300 USA Student Brass Tenor Trombone - w/ Case Missing Mouth Piece
$111.82est. delivered
Sold as is by a Goodwill store, with a hard case and no mouthpiece, at $112 delivered with no bids yet. There's no playing claim, so have a shop check the slide before counting on it.
Bach TB300 Tenor Trombone Brass Instrument With Hardcase As Is No Mouthpiece
Delivered prices include shipping as eBay quoted it to a US address on Oct 12, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Snapshot
Checked . Some may have sold.
Delivered prices include shipping as eBay quoted it to a US address on Oct 12, 2026. Many sellers charge by distance, so your total may differ. eBay shows yours before you pay.
Used$106.00est. delivered
$71.00 + $35.00 shipping
Auction · 11 bids · ends in 19h 3m
Good buy
Titled in playing condition. Auction with 11 bids, the price will climb.
Seller: bandgenterprisesinc
99.8% positive
Used$205.62est. delivered
$180.00 + $25.62 shipping
Buy It Now$180.00
Good buy
Titled with case. Mouthpiece missing.
Seller: wixel_retail
100% positive
For parts$111.82est. delivered
$79.99 + $31.83 shipping
Auction · no bids yet · ends in 1d 5h
Project piece
Sold as is, with hard case, no mouthpiece. No bids yet.
Seller: goodwill-maine
99.8% positive
Used$240.00est. delivered
$180.00 + $60.00 shipping
Buy It Now$180.00
Our take
Titled USA. Photo shows it in a case.
Seller: carlo-marri
100% positive
For parts$55.50est. delivered
$10.50 + $45.00 shipping
Auction · 6 bids · ends in 1d 9h
Check the seller
Titled Needs Help, with a cartoon instead of a photo of the horn. Ask for real photos.
Seller: algee2
99% positive
Used$319.00delivered
$319.00 · free shipping
Buy It Now$319.00
Check the seller
Titled with case and mouthpiece, plays well. Seller at 95.1%.
Seller: forgoodnessgracious
95.1% positive
![BACH TB300 Tenor Trombone [B99759]](https://i.ebayimg.com/images/g/iwoAAeSwcflqfqgc/s-l500.jpg)
Used$937.00delivered
$937.00 · free shipping
Buy It Now$937.00
This seller takes offers, and many sellers accept less than the asking price.
Fine if you might miss it? Send an offer first. Someone else can still buy it while you wait for a reply.
Want it for sure? Use Buy It Now.
Priced high
From a Japan dealer, about 3.4 times the median.
Seller: ishibashimusic
100% positive
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