1970 Marshall JMP 50 1987. From the personal collection of Joe Bonamassa. This early small box JMP 50 is a Rock ‘n’ Roll machine! Plug in, turn up and let it rip. Very good condition with some wear, small tolex tears. Two extra, unused holes in the back of the chassis and original plug has beed changed to a modern IEC type. This amp sounds fantastic and is from the best years of classic Marshall tone. Great midrange bark and a smooth, singing overdrive. Pair it with a 4×12 Marshall cabinet for a huge sound that will shake the ground!

Year Condition Color Case
1970 Very Good Black None


Emerald City Guitars
Jay Boone
Seattle, WA
11:51 AM
10am-6pm Monday-Saturday Closed Sundays

We accept Cash, Visa, MC, Discover, AMEX, Paypal, certified cashier's check or money order, and direct bank tranfers.

We ship UPS, FedEx, USPS, and BAX Global

Emerald City Guitars has a 72 hour return policy unless otherwise arranged with the owner Jay Boone.