Amp Kit - MOD® Kits, MOD102+ guitar amp

Mod Kits
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Customer image:<br/>"Made a combo with an old radio with it , I love it . Great sounding amp thanks guys!"
Customer image:<br/>"My version of the Mod 102+ Tweed"
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Customer image: "Made a combo with an old radio with it , I love it . Great sounding amp thanks guys!"Customer image: "My version of the Mod 102+ Tweed"

Amp Kit - MOD® Kits, MOD102+ guitar amp

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The MOD102+ expands on the same all analog vacuum tube classic American circuit design combined with a British style Class A output section as the Original MOD102 with additional “+” features. These special features include a three position progressive toggle switch for off-standby-power and additional push-pull functionality for each control - pull out the bass control knob for “mid boost”, pull out the treble control knob for “bright”, pull out the volume control knob for “turbo”. These new features and a JJ ECC803-S (a long plate 12AX7 known for its complex mid range tones) allow for a wider variety of tones and extra control for the user.

MOD 102+ Guitar Amp Kit Features:

  • All-Tube Design (solid-state diodes used only for full-wave rectification)
  • 8W output power into 8 Ω
  • 1 channel
  • Vintage channel controls with push-pull functionality: bass (+mid-boost), treble (+bright) and volume (+turbo)
  • Vintage pilot lamp and screw-on jewel cover for power-on indication
  • Output Impedance: 8 Ω
  • Tubes included: one ECC803 (JJ Electronic brand preamp tube), one EL84 (JJ Electronic brand power tube)
  • Hammond Mfg 269EX power transformer and P-T31 single ended output transformer.
  • Cathode biased class A power tube operation (no bias adjustment needed).
  • Point to point hand wiring using terminal strips
  • Carbon film resistors
  • Metalized polyester coupling caps
  • Pre-punched steel chassis
  • Assembled Kit Weight: 5.55 lbs.
  • Assembled Kit Dimensions: 10" Width x 6" Depth x 5 ⅛" Height
Build Difficulty
Item ID:
Mod Kits
Product Measurements by Type
Item Height5.125 in.
Item Length10 in.
Item Width6 in.
Output Impedance (Zout)8 Ω
Output Power (POut)8 W
Packaging Information
Packaging Dimensions13 in. × 11 in. × 9 in.
Weight (Packaging)6.4 lbs.
PDF: InstructionsAll Models
PDF: Assembly DrawingsAll Models
PDF: Filter Cap Drain ModAll Models
PDF: Parts List DrawingsAll Models
PDF: SchematicAll Models
PDF: Troubleshooting SupplementAll Models
MPEG: Sound SampleAll Models

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Specifications, Files, and Documents

Sound Samples:

PDF: Assembly Drawings Assembly Drawings262.73 KB
PDF: Filter Cap Drain Mod Filter Cap Drain Mod260.09 KB
PDF: Instructions Instructions1.47 MB
PDF: Parts List Drawings Parts List Drawings264.98 KB
PDF: Schematic Schematic232.51 KB
PDF: Troubleshooting Supplement Troubleshooting Supplement386.86 KB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on October 3rd, 2015.
October 7th, 2015
Staff Member
Top Contributor
This amp puts out a max 8 watts output with an 8 ohm load. I'd probably suggest either a Jensen C8R or C10R if you prefer a 10" speaker. A 12" speaker such as a C12R can be used as well. You can visit to check out sound samples.
Francois Poirier
December 30th, 2015
you suggest C10R or C12R, but what wattage?
December 31st, 2015
Staff Member
Top Contributor
The C10R and C12R are both 25 watt speakers.
March 1st, 2018
I've built two of these amps and a third I modded a bit. They sound great through 12" speakers. Put it through a 4x12 if you want. It sounds huge through 12's.
Asked by Anonymous on November 22nd, 2016.
Matt H
November 22nd, 2016
In regards to speaker wattage, you can go up in wattage but you do not want to go down. An 80-90W speaker will work as long as the ohms match. Since this is an 8 watt amp, it is not going to, "push" you speaker to its full potential and break it up. Some people like speaker breakup and some people don't.
March 1st, 2018
They sound great through my Egnater cabs. I have two 80 watt Celestion Elite speakers that I run it through and it sounds great.
Asked by mgb3333 on November 29th, 2017.
Matt H
December 1st, 2017
You can try either the P-T125CSE or P-T125DSE. The footprint will be different as these are larger transformers and you will have to drill at least one extra hole.
March 1st, 2018
I just built a 102+ with a Classic Tone 40-18031 with 4-8-16 0hm taps with a rotary switch and dual jacks. Adds a lot of versatility and the tonal difference is huge.
Asked by Anonymous on February 14th, 2020.
February 14th, 2020
Staff Member
For optimum performance, we recommend using an 8 Ohm load with this kit.
March 5th, 2020
I can imagine your brain flashing off all these questions as you read the part about 16 ohm speakers. My mind does the same thing all the time. Now if you knew about speakers the answers would have came right after the questions. Let me fill you in on a few fun speaker facts. Speakers wired in series will double the impedance in the circuit. This occurs because the impedance of each speaker is summed. In other words the signal path has twice as much resistance. Note that the volume of the two speakers will be cut in half in a 16 ohm circuit. We are talking 8 ohm speakers here but the math is the same for other impedance values. Speakers wired in parallel will reduce the impedance in the circuit by half., Two eight ohm speakers in parallel will present four ohm's on the circuit. The volume will double as well. Parallel wiring opens up a second path for the signal to follow making it easier on the signal. Keep in mind if your amp is not rated for four ohms you run the risk of damaging it. An eight ohm amp will need to produce twice the current to feed four ohms, the extra volume. It is safer to run sixteen ohms, but this will cut your volume in half. A four ohm and an eight ohm speaker wired together would not work out very well as they would have different volumes. I know it seems a waste to not use an old speaker that has been laying around and it is, just find the right application for it or perhaps trade it for something you can use. The main point here is that mixing speakers with different impedance values is not a good idea. The eight watt rating i think is optimal and the five watt rating is more realistic for this amp.. I do like the idea of running four twelve inch speakers with this amp. To do so you would need to wire two eight ohm speakers together in parallel, twice so that you had two four ohm circuits. You would then wire these two circuits in series to end up with eight ohms. Nice.
Asked by Anonymous on September 8th, 2015.
September 8th, 2015
Staff Member
Top Contributor
This amp is currently available only as a kit with no chassis customization options. We do offer IEC connectors for future modifications.
Asked by Francois Poirier on December 30th, 2015.
December 31st, 2015
Staff Member
Top Contributor
The C10R and C12R are both 25 watt speakers.
Asked by Anonymous on February 11th, 2016.
February 12th, 2016
Staff Member
Top Contributor
This amp is capable of providing 8W of output power.
Asked by Anonymous on November 11th, 2016.
Matt H
November 11th, 2016
Since this is an 8w amp at 8ohms, an 8ohm P10R should work just fine and sound fantastic.
Asked by Anonymous on February 24th, 2017.
Matt H
February 24th, 2017
It attached to the top of the chassis flush. That way there is no obstruction to the controls.
Asked by Anonymous on July 18th, 2017.
Matt H
July 19th, 2017
Yes, some people have mounted this as a combo.
Asked by Anonymous on August 29th, 2017.
Matt H
August 30th, 2017
Yes, do a search for K-MOD102-F. This is our foreign version of this kit.
Asked by Anonymous on September 13th, 2017.
Matt H
September 13th, 2017
You will want to order this kit and this power transformer: P-T369EX. The footprint is different and you will have to re-arrange it on the chassis.
Asked by Anonymous on December 25th, 2017.
Matt H
December 29th, 2017
This would be possible and at the discretion of the builder. We would not be able to offer and support on how to achieve this mod.
Asked by Anonymous on March 8th, 2018.
Matt H
March 9th, 2018
Not without modification and that would be at the discretion of the builder. We do offer a reverb tank kit called The Wave. Do a search for: K-MOD103.
Asked by Anonymous on August 10th, 2018.
Matt H
August 10th, 2018
We do not offer this kit with a 220V transformer but we can special order this transformer for you: Please note that this transformer will not fit the footprint of the chassis and you will need to drill a hole or two to make it fit.
Asked by Anonymous on September 22nd, 2018.
September 25th, 2018
Staff Member
The P-T369EX should work electronically, but may have a different footprint. Modifications to the chassis may be necessary for installation.
Asked by Anonymous on January 17th, 2019.
February 1st, 2019
Staff Member
Yes, it is safe to use a 16 Ohm speaker with this amp.
Asked by Anonymous on November 22nd, 2019.
November 22nd, 2019
Staff Member
Yes, it is essentially a boost to allow for more drive and compression.
Asked by Prudhom on February 10th, 2020.
February 11th, 2020
Staff Member
For optimum performance, you would want to run a 2x12 cab with two 16 Ohm speakers in parallel or with two 4 Ohm speakers in series. If this simply isn't an option, we suggest wiring two 8 Ohm speakers in series to get a 16 Ohm rating.
Asked by Anonymous on February 26th, 2020.
March 2nd, 2020
Staff Member
This is a kit and you are free to make any substitutions you desire. Keep in mind, any additional potentiometers would have to be purchased separately, and we do not support modifications of this type for our kits, so we would not be able to advise on what you need or how to install them.
Asked by DougWheeler on November 1st, 2020.
November 4th, 2020
Staff Member
Using the amp with no load is not recommended and can damage the amplifier.

Product Reviews

5.00 out of 5 based on 2 reviews


- September 18th, 2021
4 out of 5

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- June 27th, 2019
5 out of 5

This is a great kit. I wanted to build a small amp so i started researching schematics online.
Then i found this kit. All the leg work has been done as well as step by step instructions.
I just started it so i can’t comment on tone,
but the ease and design of the kit is excellent.
Full parts list, schematic and instructions include.
It gives you a proven simple platform to start with and you can add your own modifications if you wish. Thanks MOD

- April 18th, 2019
5 out of 5

I just finished this amp build and it sounds fantastic! I also just finished a Marshall 18 Watt clone and I have to say that the MOD102+ holds its own very nicely alongside the Marshall. In fact, I will probably use the MOD102+ for recording because it sounds amazing at lower volumes (the Marshall is loud AF). Honestly, if I were only going to build one of them today, it would be the MOD. I'm blown away by the tone! Great kit with excellent instructions. Great bang for the buck. The parts all seem to be top quality. I love the old style cloth solid core wire, too. I find it much easier to work with than modern stranded wire. The labels are a bit lame but I covered them with packing tape as suggested before cutting them out and they look fine. If you're thinking about building an amp, build this one.