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Marshall JCM900 4100 100-watt 2-channel Tube Head

100-watt 2-channel Tube Guitar Amplifier Head with 4-band EQ, Reverb, Effects Loop, and Line Out
$2,999.99

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Get Big Rock Tones with the JCM900 Reissue

Bring legendary Marshall tone to your rig with the JCM900 4100 guitar amplifier head. With dual channels, a shared 4-band EQ, and 100 watts of all-tube power, you've got an amp that is ready for any gig on any stage. This version of the Marshall JCM900 includes a series effects loop with true bypass operation — perfect for gigging musicians with lots of pedals. Step up to the professional's choice for outrageous Marshall tone — the JCM900 4100 guitar amplifier head.

The versatile sound of rock

Plug your favorite guitar into the all-tube, 100-watt JCM900 4100, hit a chord, and hold on — that tingling behind your eyeballs means you've tapped into the tone that shaped modern rock. The JCM900 won over tons of guitar players with its incredible versatility. Channel A goes from sparkly clean all the way up to raucous crunch and everything in between. Channel B gives you everything from crunch to soaring, saturated lead tones. Each channel on the Marshall JCM900 features independent volume, reverb, and gain. The shared 4-band EQ lets you dial in exacting tonalities for any sound you need. The Marshall JCM900 4100 is an amazing and flexible workhorse amplifier head.

Marshall heritage and quality

Every Marshall JCM900 is made at the Marshall factory in the tonal heart of England. Time-tested, traditional methods of craftsmanship and construction are combined with the latest advances in modern manufacturing technology, ensuring world-class build quality and roadworthiness. Internally, the JCM900 circuitry and layout has been kept to a minimum, ensuring the integrity of the guitar tone and an incredibly low noise floor — this coupled with meticulous valve selection and high tolerance, quality components adds to the all-important reliability factor that is synonymous with the Marshall legend.

Add your favorite pedals with the series FX loop

Consider yourself lucky, because this JCM900 4100 sports a feature not found on the original JCM900 — a series effects loop! And thanks to true bypass operation, your slew of pedals won't color the tone of the JCM900 4100 one bit.

Marshall JCM900 4100 All-tube 100-watt Guitar Amplifier Head Features:

  • Reissue of the beloved JCM900 all-tube head
  • Incredibly powerful at 100-watts — not an amp that's made to be played quietly
  • All-tube design and tone featuring ECC83 and 5881 tubes
  • Series FX loop lets you switch effects pedals in and out, with true bypass operation for sonic transparency
  • Straightforward control set is all you need to craft a range amazing guitar tones
  • 2 speaker outputs for connecting extension cabinets
  • Birch-ply construction is incredibly strong and ready for life on the road

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Tech Specs

  • Type: Tube
  • Number of Channels: 2
  • Total Power: 100W
  • Preamp Tubes: 2 x 12AX7 (preamp), 1 x 12AX7 (phase invert)
  • Power Tubes: 4 x 5881
  • Reverb: Yes
  • EQ: 3-band EQ, Presence
  • Inputs: 1 x 1/4"
  • Outputs: 2 x 1/4" (speaker out), 2 x 1/4" (direct, compensated)
  • Effects Loop: Yes
  • Footswitch I/O: 1 x 1/4" (channel, reverb)
  • Footswitch Included: Yes, 2-button footswitch
  • Bias Type: Adjustable Fixed
  • Construction Material: Black Tolex
  • Power Source: Standard IEC AC cable
  • Height: 12.2"
  • Width: 29.5"
  • Depth: 8.6"
  • Weight: 41.5 lbs.
  • Manufacturer Part Number: 4100

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Customer Reviews

Write your review
Rated 5/5

Solid sounding head!

I bought a reissue jcm900 and I am pleased with it.
I always wanted one back in the day but couldn't afford one back then. (Typical broke kid musician)
Its an excellent head when cranked up. On 50 watt switch and volume on 4 and gain maxed, its got a nice tonal sweet spot that sounds as expected!
This is a great head with lots of potential with pedals on clean or dirty.
Rated 5/5

Great Amplifier!

Like many reviewers here I have owned my JCM900 since the early 1990's. I sure hope Marshall still makes these exactly like they used to because this is a KILLER amp. During my many touring days other guitarists would constantly approach me to ask me about my sound/tone. I'd laugh, it was just a Les Paul plugged into a Marshall JCM900. My JCM900 withstood years or road/roadie abuse and I'm going to venture to say I recall it NEVER broke down on me during a show or recording session in all those years. I have other amps, rectifiers, JMP's etc. While different amps are nice to have this one is the desert island amp hands down.
Rated 5/5

Awesome amp

This is a great amp! I would bypass the direct outputs and mic it btw also get a power attenuator to hear it's full potential! Just remember to take care of your tube amps! Warm them up for 5 minutes before playing and when you first buy a tube amp check/adjust that bias voltage! As always Jeff at Sweetwater made the transaction easy!
Rated 5/5

Don't listen to the haters

This amp rocks. One of the best clean channels on the market and an ultra versatile dirty channel. People that hate on this amp simply don't know how to use it. They mention diode clipping as if it was something bad yet go on and praise the silver jubilee which also has it. This amp will take you to the 80s and all through the 90s is pure rock tone.
Rated 5/5

Great amp, no doubt about it

Have a JCM 900, a DSL 100H, and a JMP mkii (and a bunch of other non-Marshall 100 watt heads). I mainly play it through a Torpedo Studio and with this unit I can crank up the master volume as much as I want and listen through monitors, PA, or headphones at any level. It's a beast. Great cleans, and can be used as a pedal platform. The drive channel is awesome too. Yes it's not an 800, and yes it has "diodes" somewhere in the chain who cares. It's a bit darker than an 800 is about all.

There are countless "British"-style guitar amplifiers out there, but take it from the lifelong guitarists and tone connoisseurs at Sweetwater, when it comes to Marshall tone, there's nothing like the real thing. We've played them all, from vintage JTM45s and the ultra-cool Plexi reissue to modern handmade masterpieces such as the JVM410. There isn't a model among them we can't recommend with total confidence, and that includes their more affordable models too, like MG, DSL, and Code series amps. Thanks to our tight relationship with Marshall, Sweetwater's always on the cutting edge of their latest designs, custom models, and limited-edition gems. If you want iconic tone from across the pond, you want Marshall, and your Sweetwater Sales Engineer will help you find the perfect one.

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