The El Guapo


The El Guapo™ is a Two Channel 100W Plexi/High Gain Monster! Designed on the foundation of our favorite model of Vintage Plexi, the El Guapo features thick and articulate cleans that drip with harmonic richness, and reaches into the future with high-gain modern guitar tones that allow the player to cover a plethora of musical styles with ease!

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The El Guapo (it uses EL-34 tubes) is a collaboration between Jackson Ampworks and one of the greatest blues guitarists of our time; Josh Smith. Josh approached us a few months ago asking if we had any interest in making a 100W Super Bass with a Super Lead voiced High Gain second channel. As it turns out, I was about to start working on a 100W Super Bass design so the timing was perfect for our collaboration on this amp.


Josh and I are both huge fans of the early 100W Super Bass circuit (it’s my favorite of all the Plexi’s) so when we first started brainstorming ideas for the El Guapo we immediately placed priority on keeping the core tone of the Super Bass intact. The low-mid voicing in the Super Bass circuit takes single coil pickups exceptionally well and fattens them up to be on par with humbuckers. So the top priority for the El Guapo was that it have a super rich and authentic vintage sounding Plexi clean channel with all the authority and punch that you’d expect from a hand picked Super Bass.

Once that goal was met, I set about designing a Super Lead voiced second channel that would do everything from vintage Super Lead Plexi to modern high gain tones. The trick with the El Guapo was in crafting both channels to have their own unique voice without borrowing from each other and compromising each other’s design intent. 

In order to make those two voices come into harmony with each other, it took a lot of careful planning and design work to keep the channels as independent as possible while still sharing a common set of tone controls. The final challenge was in creating a system where transition from one channel to the next is seamless and allows for a gradual upward shift in gain from Channel 1 to Channel 2. Finally that transition had to be completely silent when channel switching with zero artifacts and without compromising the tone.

After months of work I’m very pleased to say that I believe we hit our design goals and that the El Guapo is an incredible sounding amplifier. I feel that the El Guapo effortlessly captures some of the most iconic guitar tones from the past while pushing towards the future with modern high gain tones.

Keep reading below to see all that goes into the El Guapo and all the features we have included in the world’s smallest 100W Plexi inspired amp!

Channel 1

Channel 1 of the El Guapo has some of the richest and punchiest clean tones you’ve ever heard and is a dead ringer for the tones that you hear coming from Hendrix and guys like Doyle Bramhall II who famously have used Super Bass amps over the years. With the 100W power section (switchable down to 50W) Channel 1 of the El Guapo has an unbelievable level of clean headroom and will shake the walls of your house before it ever starts breaking up!

About half way up on the Gain control for Channel 1, the El Guapo starts to break up and becomes one of the richest and most responsive blues amps ever created! From there on up on the Gain control you’ll move out of blues tones and on into Hendrix inspired rock tones! Of course all of these tones are immediately available at your fingertips if you run the Gain control all the way up and use the volume control on the guitar to adjust the level of overdrive.

Channel 2

“Jefe? Would you say I have a Plethora of Gain?” “Si El Guapo. You have a Plethora of gain.”

The second channel of the El Guapo picks up gain-wise where Channel 1 leaves off and is voiced brighter like the Super Lead circuit. Think of these two channels as an alternate personality of the same person. While the first channel on the El Guapo is voiced dark and rich, the second channel is voiced brighter with a controlled low-end and expanded top end range. Add to that a ton of available gain and tonal shaping options and the second channel of the El Guapo has enough gain to cover everything from early Van Halen to the hardest rock imaginable! 


No proper tribute to a 100W Marshall would ever be complete unless it came loaded with 100W of power! Within the past 10 years we have seen a shift towards players using lower and lower wattage amps and while lower powered amps do have a needed place in the market there is nothing that comes close to the grin-inducing blast of sound that can only come from a 100W+ amplifier running at full tilt! More power doesn’t just mean more volume, it also means more headroom. So if you’re a guy who loves playing clean, then power is your friend.

There is a lot of debate among players with regard to output power on guitar amps and specifically Marshall style amps. 50W or 100W? Which one sounds better? Is 100W too loud? Is 50W loud enough? This is my perspective on this issue. For me, less is not more. More is more. When you get down to the details of the matter, a 100W amp is only 3dB louder than a 50W amp so the volume is not really a determining factor. What IS a determining factor is TONE! Having played the El Guapo extensively over the past few months, I can attest that there is just the slightest difference in volume between the 100W and 50W mode. However, what you will notice immediately is how the 100W mode fills out the room and helps to tighten up the low end and gives the amp more overall headroom. That low end punch is huge contributor to what people are describing when they use words like “kerang” when a huge power chord is hit. It’s just one of the most musically inspiring sounds a guitarist can make and is something that everyone needs to experience in their playing!

Having 100W of power available does not mean that you HAVE to use all of it or that you can’t turn the amp down. You certainly can, however it’s nice to have it available when you need it. Think of a 100W amp like a Ferrari. A Ferrari can go 60MPH on the highway with everyone else but not everyone else on the highway can go 200MPH! So if you need more power for playing super clean and high volumes or you just want the low-end punch that comes from running a raging 100W amp into one of our Dual Ported Cabinets you can’t go wrong with a 100W amp.

That being said, we did include a half power switch on the back of the amp. With the 50W/100W switch, the player now has the option to decide for themselves which tone they prefer and can switch it as needed depending on the room or the gig.

Please be aware that during testing of the El Guapo we measured a maximum sustained output of 132W when the amp was running wide open. This is the maximum power level that we could generate with the amp and should be used as a guide when selecting a set of speakers to use with the El Guapo.

Below is a table of measured wattage shown for both max clean power and max output in both the 50W and 100W modes.

2x EL3440W66W
4x EL3494W132W


The El Guapo contains a feature rich front panel that allows the player to sculpt his/her tone to perfection!

From Left to Right we have:

Inputs – The El Guapo features two inputs that feed the preamp of the amplifier. The top input should be used when maximum gain is desired or when using a guitar with low output. The bottom input should be used when maximum clean headroom is desired or with guitars that have high output. The bottom input has approximately a -6dB reduction in gain.

The front panel controls are: Gain.1, Gain.2, Treble, Middle, Bass, Master.1, Master.2 and Presence.

Gain.1 – Gain.1 adjusts the volume of Channel 1, the Super Bass Channel. This control, used in conjunction with Master.1 sets the gain to volume ratio of the first channel. Higher settings on the Gain.1 control will give more preamp overdrive and breakup. For the true vintage Marshall experience, I recommend that you turn the Master.1 control all the way up and use Gain.1 to adjust the volume of your clean channel. Doing so will bypass the Master.1 control and allow the Super Bass preamp to perform as it would on a vintage amp.

Gain.2 – Gain.2 adjusts the volume of Channel 2, the High Gain Super Lead Channel. This control, used in conjunction with Master.2 sets the gain to volume ratio of the second channel. Higher settings on the Gain.2 control will give more preamp overdrive and breakup. For a good balance with Channel 1, I recommend that you use Master.2 to set the volume of Channel 2 to match the volume of Channel 1. Remember you can use the Boost footswitch for an added Gain and Volume boost for solos etc!

Treble – The Treble control is used to fine tune the high-end response of the amp. Turning the control clockwise adds more treble.

Middle – The Middle control is used to dial in the mid-frequency response of the amp. There is a lot of flexibility in this control. Experiment to tune the amp to the guitar being used. Turning the control clockwise adds more mids.

Bass – The Bass control is used to fine tune the low-end response of the amp. Turning the control clockwise adds more bass.

Master.1 – Master.1 is used to control the overall volume of Channel 1 and can be used very effectively in conjunction with Gain.1 to set the overall gain and volume of Channel 1. Higher settings gives higher volume. To have Master control completely out of the circuit, turn it fully clockwise.

Master.2 – Master.2 is used to control the overall volume of Channel 2 and can be used very effectively in conjunction with Gain.2 to set the overall gain and volume of Channel 2. Higher settings gives higher volume. To have Master control completely out of the circuit, turn it fully clockwise.

Presence – The Presence control is used to adjust the intensity of the tone, making it sound more raw and present as the control is rotated clockwise. Experiment with this control along with the Treble control to dial in the high-end response of the amp.

Voicing switches.

In addition to the six knobs on the front panel, we have included six switches that allow for dramatic tone shaping all by themselves!

From left to right we have:

Channel 1 Bright Switch – We have included a 3-position bright switch for each channel of the El Guapo. The center position is the OFF position and adds no extra brightness to Channel 1 and is the core Super Bass tone. The B1 position adds a moderate level of highs to the tone to help guitar parts stand out more or when a brighter overall tone is needed. The B2 position adds additional brightness to what was added with B1 and is great when using dark guitars that need a high frequency boost in order to cut through the mix. Note: Increasing the Gain.1 control diminishes the effect of this switch.

Channel 2 Bright Switch – the Channel 2 Bright Switch performs the exact same function as the Channel 1 Bright Switch albeit with Channel 2.

Ch.1/Ch.2 – This is a manual channel switch control. Have you ever gotten to a gig and forgotten to bring your footswitch for your amp? If you do while using the El Guapo, we’ve got you covered since you can make the switch manually. Note: When a footswitch is plugged into the Channel Switching jack on the back panel of the amplifier it takes priority over the front panel switch and the front panel switch will cease to work. 

NRM/BST –The Boost feature on the El Guapo is one of the most effective controls for taking the second channel from vintage to modern! When this footswitch-able feature is activated, additional preamp gain is added to the signal along with a subsequent boost in volume. This features is incredibly useful as a solo boost or as a higher gain preset. Like the Ch.1/Ch.2 switch, when a footswitch is plugged into the Boost jack on the back panel of the amplifier it takes priority over the front panel switch and the front panel switch will cease to work. 

LO/HI – The Low Gain/High Gain switch is used to add massive amounts of gain to Channel 2 and also adds increased low-end and fullness and takes Channel 2 out of Vintage mode and into the Modern mode. 

Response Switch – Possibly the most powerful and dramatic switch on the entire amplifier, the Response Switch alters the power amplifier stage and is almost like an era switch for classic Marshalls. In the JTM mode, the amp will take on the dynamics and response of a 1965 JTM45 with a fast and clean attack with added headroom and articulation. In the JMP mode, the amp breaks up a little more and mirrors the dynamic response of a 1968 100W Plexi with a looser response while staying very crisp with a lively attack. Finally the JXN mode is our own design, and when in this setting, the amp takes on a looser and more open dynamic response that is very similar to our Class A British Clean series of amps. Experiment with this switch and the Presence control to create your own ideal clean and overdriven tones. Note: The Presence control remains fully functional during all of these modes. 

Rear Panel

From right to left we have:

Parallel Speaker Jacks – Parallel speaker jacks allow the player to use more than one speaker cabinet at a time with the El Guapo. Because these jacks are wired in parallel, there is no difference in tone between them and either one or both can be used without effect.

Impedance Selector Switch – The Impedance Selector Switch allow the user to use the amp with any guitar speaker cabinet available as long as it is either an 8 or 16 ohm cabinet.

Channel Switch/Boost Footswitch – We have included a jack to insert a two button footswitch that will allow you to control the Channel Switching as well as the NRM/BST mode of the El Guapo remotely. For this to work properly you must use a footswitch that features a stereo cable as the TIP connection shorts to ground to activate Channel 2 and the RING must short to ground to activate the Boost mode. Note: When a footswitch is plugged into the Channel Switching jack on the back panel of the amplifier it takes priority over the front panel switch and the front panel switch will cease to work.

FX Loop – To make the El Guapo even more flexible, we have incorporated a buffered series FX loop between the preamp (post Master) and power-amp. Adding an FX loop here allows the player to use his/her effects in the loop and not interfere with the critical relationship between the guitar and preamp.

50W/100W Switch – This two position toggle switch is used to select either the 50W Class A/B or the 100W Class A/B power modes for the El Guapo. You should expect about a 3dB drop in volume when in the 50W mode. 

B Fuse – This fuse is used to protect the amp in the event of a short in the high voltage circuit. replace only with a 1A Slo-Blo fuse rated for 250V

Standby Switch – This Standby Switch interrupts the high voltage DC inside the amp and effectively puts the amp in a resting state until the user selects the Play position.

Power Switch – This switch turns the amp on and off and when on powers the cooling fan and every circuit except for the high voltage DC circuit.

IEC Module – In addition to serving as the power entry for the El Guapo, the IEC module also doubles as a voltage selector for the amplifier and is used to select between either 120 or 240V operation. With this features you can travel worldwide with the El Guapo and regardless of line voltages have consistently great tone without having to carry a step-up/step-down transformer! Lastly the IEC module also contains the 4.0A Mains Fuse for the amp as well as a spare fuse.


The El Guapo in a lot of ways is a return to my roots as the first amp I ever built was a 50W Plexi kit. The tones found in early model Plexi’s have always been benchmark tones for me and always will be. To come back to these tones over 10 years after having started this business is very rewarding, and in a lot of ways feels like home to me. I sincerely hope that you’re able to try out the El Guapo and let us know what you think about it. I’ve loved every minute that I’ve spent working on this amp and feel more inspired in my craft than ever before. I hope that the El Guapo makes you feel the same way as you play through it.

Like the El Guapo?
Do you want a plethora of tone?

If you like what you see and want more information about the El Guapo, fill out the form to the right and we’ll be in touch with you shortly!



Output Power 50W – 2x – EL34
100W – 4x – EL34
Fixed Bias
Fixed Bias
Tubes Preamp 3x 12AX7
  Phase Inverter 1x 12AX7
  Output 4x – EL34
Rectifier Solid State  
Input Impedance  1MΩ
Weight Head Cabinet – 35lbs. Boxed
1×12 Combo – 50lbs Boxed

Head Size: 14″ x 8.5″ x 8.25″
Head Size (Boxed): 19.5″ x 13.5″ x 14″
1×12 Combo Size: 18.5″ x 10.5″ x 17.5″
1×12 Combo Size (Boxed): 22.5″ x 14.5″ x 21.5″
Line Voltage 120VAC or 240VAC Switchable via Back Panel

1 review for The El Guapo

  1. Rated 5 out of 5

    tony mckenzie

    I bought this amp specifically to review. And the fact is, this is one incredible amplifier that completely nails the jtm, the plexi and even adds a third option to literally hammer modern rock from a plexi style amp without any other drive pedals necessary. It takes weh pedals wonderfully. I completed a whole inside and out review on YouTube here: and the review includes a full inside showing, outside and controls and lastly played. One incredible amplifier of which there is no way that I’ll be selling this anytime soon, and from a guy with over 30 of the worlds best amps that’s a real recommendation.

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