20W all-valve "Plexi" head with FX loop and DI


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Capturing the classic Marshall spirit with an iconic British built valve amp.

 Rig Review - The 20w Plexi

The Plexi – by: Ben Scott

“Pete Townshend, Eric Clapton, Jimi Hendrix, Jimmy Page, Billy Gibbons, Ace Frehley, Slash, Randy Rhoads…… and the list goes on and on.  What do these guys have in common?  These guys are “Guitar Gods”, and while their individual tone varies greatly, they’ve all utilized the Plexi at some point in time while creating some of the most iconic guitar tones the world has ever known.   

I took one of these amps out to a gig one night to see what it really could do, and I’ve got to say, the first set was an absolute disaster.  I ran the amp in the 5w position while attempting to “gain it up” with my pedal board while maintaining a low stage volume.  To put it simply, that was a mistake.  During the break, I bumped the amp into the 20w position and plugged my gold top straight into it.  That’s where the magic started. 

Don’t let the size of this little amp fool you, it’s an absolute MONSTER!  You see, I tried to make the amp into something that it wasn’t.  The amp didn’t like that anymore than we like it when our wives try to turn us into something or someone that we aren’t.  When I embraced the amp for what it was, turned it up, and quit covering up it’s inner beauty with pedals….. it came to life.  Just because this amp comes in a small package doesn’t mean that it doesn’t have that Plexi sound, vibe, and mojo oozing out of its pores. 

If you’re looking for a quiet amp, keep looking.  This one isn’t for you.  If you’re looking for that iconic “Plexi” sound in a compact format at a more manageable volume, look no further.  The 20w Plexi “mini” is one of my absolute favorite amps out there right now on the market.”

Written by: Ben Scott


Based on an amp that inspired generations of iconic guitarists, the 1959SLP. Marshall Studio Vintage amps deliver the unmistakeable tone shaping and harmonics that are expected from the 1959SLP in a portable format. You can play anything from saturated blues tones to biting leads for classic rock. Studio Vintage amps provide four separate inputs for you to blend your sound, distinctive EQ settings including presence control, a DI output and power reduction. VALVES 2 x ECC83, 1 x ECC83 (phase splitter) and 2x EL34 CHANNELS Single channel with four separate inputs High and low sensitivity loudness controls POWER CONTROL 20W or 5W SPEAKERS 1 x 10” Celestion V-type 10” (combo only) EQUALISATION Treble, middle, bass and presence SPEAKER OUTPUTS 5 x 1/4” jack sockets (16Ω load / 8Ω load / 4Ω load) OUTPUTS DI Output

Tame the untameable

Everything you expect from the 1959SLP now available with power reduction technology, letting you shift through the gears from 20W to 5W.

Classic sound captured

Accurately recreating the iconic sound heard on thousands of influential tracks from across the years.

Iconic stylings

A sonic essential lovingly recreated for today’s player, the SV20H the truly mirrors the 1959SLP.

Technical Specification


Output wattage
20W (with power reduction option to 5W)
5 x 1/4” jack sockets, selectable 16Ω / 8Ω / 4Ω load
4 (2 x high, 2 x low) "Lead and Bass"
Low/High power mode selection switch, presence, bass, middle, treble, high treble/loudness I, normal/loudness II
Effects loop
Yes, series, send/return

Preamp valves
2 x ECC83, 1 x ECC83 (phase splitter)
Power amp valves
2 x EL34

Detachable power cable included, speaker cable included

Dimensions (including feet and handle)
9.25kg / 20.4 lbs
500mm / 19.7"
240mm / 9.4"
230mm / 9.1"