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Marshall JCM800 Modified 100-watt Tube Head

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Marshall JCM800 Modified 100-watt Tube Head

$3,449.99 Price Tier: High-end

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Page last updated Jul 05, 2026

Pricing and availability

We compare 600+ stores and found this item at 4 stores. Prices updated May 1, 2026.

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5.0 (4)

$3,449.99

$3,449.99

$3,449.99

$3,449.99

Average Price: $3,450

High-end/Boutique

$300

$801+

Price Tier

In the Guitar Amplifier Heads category, Marshall JCM800 Modified 100-watt Tube Head 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

Price History

Based on price data from 4 merchants for "Marshall JCM800 Modified 100-watt Tube Head". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

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The Marshall JCM800 Modified 100-watt Tube Head effortlessly bridges the gap between legendary vintage tone and modern versatility. Revered by iconic bands such as AC/DC and the Red Hot Chili Peppers, the original JCM800 was a staple in the rock and punk scenes. This modified version takes that iconic sound and enhances it with a suite of features designed for today's guitarist.

At the heart of this amp is a powerful gain boost switch, allowing you to transition seamlessly from classic, warm breakups to roaring high-gain soundscapes. Whether you're crafting smooth blues or gritty metal tones, this amp has the flexibility to adapt. The addition of a mid-boost switch enhances your mid-range frequencies, making each note stand out with clarity and depth. For those looking for precision, the tight switch trims low frequencies, ensuring a sharp and articulate output.

This amp isn't just about sound; it's about craftsmanship. Built in Marshall's renowned Bletchley, England factory, it reflects a longstanding commitment to quality. The JCM800 Modified is more than just an amplifier—it's a testament to the enduring legacy of the JCM800, inviting musicians to explore new sonic territories while paying homage to the past.

Key Features:

100-watt all-tube head
Classic JCM800 tone with added modern features
Gain boost switch for extra gain and tonal flexibility
Mid-boost switch to enhance mid-range frequencies
Tight switch for precise tone control
Handcrafted in Bletchley, England
Perfect for a variety of genres from blues to metal

Product specs

Type	Tube
Number of Channels	1
Output Power	100W
Preamp Tubes	3 x ECC83
Power Tubes	4 x EL34
EQ	3-band EQ, Presence, tright switch, mid-shift switch
Inputs	2 x 1/4" (high, low)
Outputs	2 x 1/4" (4/8/16 ohms)
Effects Loop	Yes, Bypassable
Bias Type	Adjustable Fixed
Construction Material	Black Tolex
Power Source	Standard IEC AC cable
Height	12.2"
Width	29.52"
Depth	8.27"
Weight	45.19 lbs.

FAQs

What type of music genres is the Marshall JCM800 Modified 100-watt Tube Head best suited for?: The Marshall JCM800 Modified 100-watt Tube Head excels in rock, blues, and metal genres due to its classic Marshall tone and enhanced versatility with features like gain and mid boost switches.
What is the difference between the high and low inputs on the Marshall JCM800 Modified?: The high input offers more gain and is ideal for lead tones, while the low input provides a cleaner sound suitable for rhythm playing or when using pedals for overdrive.
Does the Marshall JCM800 Modified 100-watt Tube Head have an effects loop?: Yes, it features a bypassable effects loop, allowing you to integrate external effects pedals or processors into your signal chain without compromising tone.
How does the gain boost switch affect the sound of the JCM800 Modified?: The gain boost switch increases the amp's gain, providing more saturation and sustain, which is ideal for achieving heavier distortion tones.
Is the Marshall JCM800 Modified suitable for home use?: While primarily designed for stage and studio, it can be used at home, although its 100-watt output may be quite loud for small spaces. Consider using an attenuator for manageable volume levels.

Videos

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Marshall Amplification

JCM800 2203 Modified Official Demonstration | Modified Series | Marshall

Marshall Amplification

BRAND NEW FOR NAMM - Marshall JCM800 Modified Review

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Reviews

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Marshall JCM800 Modified 100-watt Tube Head.

Build quality

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Owners criticize the current JCM800 reissues for using lower quality transformers, affecting sound quality compared to vintage models.
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Older JCM800 models with vertical inputs and metal switches are considered superior due to more reliable component connections and durability.
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Comparisons

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The Friedman Plexi and BE-100 Deluxe are preferred by some over the new modded JCM800 due to better components and sound.
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The Peavey ValveKing 100, especially the v1 model, is recommended as a versatile alternative for those looking for punk and stoner metal tones at lower volumes.
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The Splawn Quickrod is favored for its ability to emulate both Plexi and hot-rodded JCM800 tones, offering versatility in a single amp.
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Mods and upgrades

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Common JCM800 modifications include the addition of a choke or altering bright caps for specific sound preferences.
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Attenuators like the Weber Mass 100 can help manage volume while retaining tone, a common solution for high-wattage amps used in smaller settings.
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The Peavey VTM-60/120 includes Jose Arredondo mods via dip switches, providing iconic tones similar to those on Soundgarden's "Badmotorfinger."
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User experience

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Vintage Marshall models like the JCM800 2203/2204 are noted for their unique sound variations even among the same model due to component tolerances.
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Value and pricing

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The price for modded series JCM800s is criticized as too high, with some preferring vintage or boutique builders like Ceriatone for better cost-performance balance.
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Use cases and applications

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A 100w JCM800 is ideal for arena settings but overkill for home use; even a 50w version may still require volume management in small venues.
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A 50w amp can still be excessively loud for home use, often not exceeding a volume setting of 3, making it suitable for large gigs but challenging in smaller spaces.
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For those not filling arenas, amps that derive their sound primarily from the preamp section are preferable for achieving desired tones at manageable volume levels.
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The JCM800 Studio 20W is recommended for home use, providing manageable volume levels while retaining characteristic crunch.
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Features and functionality

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The 2203 model is a 100 watt single-channel head, while the 2204 is the 50 watt equivalent; both require high volumes to achieve their renowned tone.
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100W JCM800 amps can exceed their rated power output, risking speaker damage when paired with 100W-rated greenback cabs.
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