Used Marshall JCM900 Tube Guitar Amp No Size

Used Marshall JCM900 4100 Dual Reverb 50W Tube Head (1991)

Overview

This Marshall JCM900 4100 Dual Reverb is a 50-watt all-tube amplifier head built in 1991 in Bletchley, England. Part of Marshall’s iconic JCM900 series, this amp delivers the aggressive British crunch and high-gain tones that defined rock and metal throughout the 1990s. With dual channels, onboard reverb, effects loop, and multiple output options, it’s a versatile head for both stage and studio use.

This example shows signs of prior professional servicing, including service stickers and a Drake output transformer dated 6-91, which aligns with early production JCM900 units. The amp has been fully tested and is functioning properly. It is currently loaded with EL34 power tubes and retains the punchy, cutting tone these amps are known for. The red tolex finish gives it a standout look compared to standard black versions.

Features

• 50-watt all-tube amplifier head
• Dual Reverb model (4100)
• Two channels with independent gain and volume controls
• EL34 power tubes
• Built-in spring reverb
• Effects loop (send/return)
• Recording/line out options
• Selectable impedance (4/8/16 ohms)
• Made in England
• Drake output transformer (dated 6-91)

Condition

This amp is in Very Good condition for its age.

• Fully tested and functions as intended
• Evidence of prior professional servicing
• Cosmetic wear throughout consistent with age and use
• Scuffs, small nicks, and wear in the red tolex, especially at corners
• No operational issues noted during testing

Store Policies

• All items are tested before listing and again before shipping.
• Orders typically ship next business day.
• Shipping is available to the continental U.S. only.
• We do not accept trades on shipped items.
• Returns are accepted within 48 hours of delivery. The buyer covers return shipping, and a 20% restocking fee applies. If you have any questions before buying, feel free to message us—we’re happy to help.