Calton Mandolin Case (Used) Over Ear Headphones The original Groove Tubes were

The original Groove Tubes were swapped out at some point for some Tung Sol 12AX7 preamp tubes and some Electro Harmonix EL84 power tubes

A traditional jumbo size with instrument with fine resonance and response

the Gibson Pickup Shop has been the source for the world's finest pickups

Often imitated but never duplicated

Dual channels allow you to plug in mics and instruments and sound great immediately

Calton Mandolin Case (Used) Over Ear Headphones The original Groove Tubes wereUsed Calton Mandolin case from when they were made in Canada. Fits both A style and F style mandolins snuggly. Features a red exterior, black interior, 3 latches and a custom sticker job. If you want peace of mind and the best protection for your instrument this is it.