Red Marshall JMP 100

$2,369.73 Price Tier: High-end

5.0 (1)

Newer option

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Page last updated Jun 30, 2026

Pricing and availability

We compare 600+ stores and found this item at 1 store. Prices updated June 30, 2026.

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4.0 (11)

$2,369.73 36 available Used

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Average Price: $2,370

High-end/Boutique

$300

$801+

Price Tier

In the Guitar Amplifier Heads category, Red Marshall JMP 100 is priced in the High-end/Boutique range. This premium gear is built to very high standards and offers premium features.

Budget

Standard

High-end

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Description

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Unlock the true power of your guitar with the Red Marshall JMP 100, a revered piece of gear in the world of amplifiers. Renowned for its iconic Plexi tone, this amplifier head perfectly marries vintage sound with modern reliability. The JMP 100 is a staple for both professional musicians and dedicated hobbyists who crave that classic rock sound. With its all-tube design, it delivers a warm, rich, and dynamic tone that can fill any room or stage. Whether you're playing in a small club or a large venue, the JMP 100 ensures your sound is heard with clarity and depth.

This amplifier head is part of a legendary series, known for its robust construction and timeless aesthetics. It features straightforward controls to dial in your perfect tone, making it user-friendly for musicians of all levels. The single channel operation allows you to focus on crafting your sound rather than getting lost in complex settings. The built-in presence control provides an extra layer of tonal customization, letting you fine-tune the high frequencies to your liking.

Key Features:

100-watt all-tube amplifier head
Iconic Plexi tone for classic rock sound
Single channel operation for simplicity
Built-in presence control for high-frequency adjustment
Robust construction for durability and longevity
Ideal for both live performances and studio recordings

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Vintage 1978 Marshall JMP Amplifier Head Red Tolex. Monster Amp!!

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Red Marshall JMP 100.

Setup and maintenance

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The amp currently runs only on 8 ohms due to a broken switch, not a damaged output transformer, which can be fixed by replacing the switch.
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Features and functionality

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The 1976 Marshall JMP lacks a master volume, requiring either an attenuator or a PPIMV for manageable volume levels.
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JMP 2203 and 2204 models are praised for their preamp distortion, which allows for excellent tone even at low volumes when preamp is maxed.
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The Peavey Windsor offers a 100-watt head with EL34s, closely resembling the 2203 circuit, providing a budget alternative.
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Value and pricing

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At £500, the amp is considered a good deal, especially since it's a limited edition red finish model.
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Use cases and applications

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The amp is ideal for classic rock covers and works well with a pedal setup for slight breakup tones.
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A Fryette Power Station allows for effective attenuation, enabling the use of a JMP Super Lead at manageable volumes without sacrificing tone.
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Mods and upgrades

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Installing a PPIMV is suggested for better volume control without compromising tone.
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Installing a post-phase inverter master volume (PPIMV) improves consistency across volume levels, retaining preamp grit at lower volumes.
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Ceriatone 2204 with a three-way bright cap mod significantly broadens the amp's adaptability with different guitars and pedals.
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The SV20 can be modified with a bright cap dial switch and cathode resistor changes for tonal customization.
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User experience

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Owners note that the 2204 model with 6550 power tubes offers a tighter power section, maintaining preamp gain clarity even at maximum volume.
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The master volume on JMP models can be touchy, getting loud quickly, but still allows for finding a sweet spot for home use.
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Comparisons

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Original JCM800s were essentially rebranded JMPs, with significant circuit changes only appearing mid-80s, leading to distinct two-channel models with increased gain.
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The JMP is noted for having more crunch compared to early JCM800s, which are described as sounding slightly fuller.
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Peavey Classic 30 and Windsor are noted for their budget-friendly, similar tonal characteristics to JMP amps, despite not being exact replicas.
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