Amp Kit - Mod® Electronics, MOD102+ guitar amp
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The Mod® Electronics 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
Mod ElectronicsAnimus Series
|Item Height||5.125 in.|
|Item Length||10 in.|
|Item Width||6 in.|
|Output Impedance (Zout)||8 Ω|
|Output Power (POut)||8 W|
|Packaging Dimensions||13 in. × 11 in. × 9 in.|
|Weight (Packaging)||6.4 lbs.|
|Assembly Drawings||All Models|
|Filter Cap Drain Mod||All Models|
|Parts List Drawings||All Models|
|Troubleshooting Supplement||All Models|
|Sound Sample||All Models|
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Questions and Answers
Click each question to see its answers.
4 answers Recommendations for a speaker. I've purchased the kit, and would like to build it into a combo.
Asked by Anonymous on October 3rd, 2015.
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 Jensentone.com to check out sound samples.
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.
2 answers Is a 80w-90w 1x12 cab ok for this or do I really have to go for 25w speakers? How will it affects the sound?
Asked by Anonymous on 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.
They sound great through my Egnater cabs. I have two 80 watt Celestion Elite speakers that I run it through and it sounds great.
2 answers Do you carry a higher end output transformer than the P-T31 that will work with the MOD 102+ amp?
Asked by mgb3333 on November 29th, 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.
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.
2 answers A couple of questions above realted to Mod102+ indicate that the amp will run on 16 ohm load, even though it's rating of 8 watts is into 8 ohm load. Similar question on speaker load for the regular Mod102 says that to use 16 ohm load you need to change the transformer. Why the discrepancy here? I get why 4 ohm should not be used, but I would expect that either amp could take 16ohm with the expected output redeuction.
Asked by Anonymous on February 14th, 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.
1 answers Can I order the enclosure with an IEC connection?
Asked by Anonymous on September 8th, 2015.
This amp is currently available only as a kit with no chassis customization options. We do offer IEC connectors for future modifications.
1 answers you suggest C10R or C12R speakers for this built,but what wattage????
Asked by Francois Poirier on December 30th, 2015.
1 answers How watts RMS is the amp output?
Asked by Anonymous on February 11th, 2016.
1 answers How about using a Jensen P10R Vintage Alnico 8Ω speaker? Any reason not to use one? Thanks.
Asked by Anonymous on November 11th, 2016.
Since this is an 8w amp at 8ohms, an 8ohm P10R should work just fine and sound fantastic.
1 answers How would the chassis cage mentioned above work....picture only shows one side but what about access to the controls etc...
Asked by Anonymous on February 24th, 2017.
It attached to the top of the chassis flush. That way there is no obstruction to the controls.
1 answers Can you flip it over and build a little combo out of it?
Asked by Anonymous on July 18th, 2017.
1 answers Can I get this kit with the Hammond 369EX power transformer to suit foreign (Australia) mains power (240v)?
Asked by Anonymous on August 29th, 2017.
1 answers I really want to get the '+' options with the 'mid-boost', 'bright' and 'turbo'- I don't think the K-MOD102-F kit comes with these options.
Asked by Anonymous on 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.
1 answers Is it possible to install a circuit or relays in order to turn on/off the Mid, Bright and Turbo functions on the amplifier via a foot switch?
Asked by Anonymous on December 25th, 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.
1 answers Can I add a reverb tank to this kit?
Asked by Anonymous on March 8th, 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.
1 answers It is a device that supports 220V in the Europan electricity network ?
Asked by Anonymous on August 10th, 2018.
We do not offer this kit with a 220V transformer but we can special order this transformer for you: https://www.amplifiedparts.com/products/transformer-hammond-power-190-0-190-v-75-ma. 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.
1 answers Hello. Which transformer would I need for 240V AC in Australia?
Asked by Anonymous on September 22nd, 2018.
The P-T369EX should work electronically, but may have a different footprint. Modifications to the chassis may be necessary for installation. https://www.amplifiedparts.com/products/transformer-hammond-power-190-0-190-v-75-ma
1 answers Would it work with a 16ohm speaker (of course with overall lower power output)? I have a cab and wanted a small head like this to use it along with my cab
Asked by Anonymous on January 17th, 2019.
1 answers What does the Turbo switch do? Is it for gain?
Asked by Anonymous on November 22nd, 2019.
1 answers I see it is only has one 8 ohm output. If I expanded from 1x12 8 Ohm speaker to a 2x12 8 ohm speaker would it be better (safer for the amp) to wire in series or parallel to have 4 or 16 ohms? Or can I combine an 8ohm and 4 ohm speake in series to split the difference at 12ohms safely? Or is there a mod of the mod kit that will let me change the ohms output?
Asked by Prudhom on February 10th, 2020.
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.
1 answers if i wanted to put different potentiometers Could I?
Asked by Anonymous on February 26th, 2020.
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.
1 answers I have enjoyed building and playing my Mod102 amp. It ws installed in a cabinet with an internal speaker. I am planning on adding a power standby switch, headphone jack and a jack for external cabinet. Can this amp handle a no-load situation? I do have a circuit plan that would switch between the internal board speaker and the external cabinet. However, if the external cabinet is not plugged in then the amp would have no load. Obviously, this would not be a normal situation but could occur by not paying attention when turning the amp on.
Asked by DougWheeler on November 1st, 2020.
1 answers Can this amp be rack mounted?
Asked by Anonymous on December 9th, 2021.
The chassis isn't sized for a rack, but if you build the kit in an enclosure sized for a rack, it is possible.
1 answers Does the Hammond 10x6x5.2 Chassis Cage work on this project?
Asked by Anonymous on January 10th, 2022.
Yes, there have been documented accounts of that cage being compatible with this amp kit.
1 answers Hi, can use This amp for an acoustic guitars because I Search a kit for acoustic.?
Asked by Anonymous on October 7th, 2022.
Completed the functional build a while back, and finally built it into a nice wooden cabinet (see uploaded picture). I've run it through several different cabinets ranging from a 1x12 open back to a 4x12 closed back. Sounds great through all of them. Plenty of volume, based on its power rating. Wish it had an effects loop post preamp, but it makes a great power stage for my pedal board (which includes Mod Kit Persuader and Saturator)
Completed mine about 6 months ago. I love it. Not an easy build, had to do lots of troubleshooting to find my errors, but it was worth it. And a fun build. Into a 10" Weber it sounds fabulous with my ES-175. Clean as can be up to a reasonable volume then great predictable breakup. Crank it wide open, it keeps on tickin'. High quality components, simple circuit. Good use of $275. See ya!
10/10, would build again.
The instructions were very well written, and the diagrams were super helpful -- I don't think they could be any easier to follow.
Sounds great, and the EQ is very expressive. The "bright" switch is super useful when playing w/ humbuckers to clear up some of the mud. Very well matched for my tele, but also surprisingly capable of handling lower frequencies -- I plugged in my 7-string tuned to drop F# just for funzies, and it handled it really well haha
Even tho this is only 8W, it still gets plenty loud, even thru my 1x12 cab. I've ordered a 15W L-pad to install at the output jack so I can crank the gain without disturbing my wife on the other side of the house :)
Great job Mod
Fun build, great instructions included. Get the instructions online for color photos.
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
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.