MOD 102+ Guitar Amp Kit

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 some much added special “+” 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 1/8" Height
Sound Samples
Product Videos
Questions and Answers
Click each question to see its answers. Looking for general answers about Mod Kits? See our frequently asked questions.
Is it OK to flip this amp over and use it while upside-down in a combo amp?
Answers (2)
MichaelT
Staff Member
March 6th, 2018
Yes, some of our customers have used the amp this way with no issues.
Anonymous
June 10th, 2020
I built the 102 and love it ? do you have a kit to upgrade for the 102+ ? and how much
Can I use this amp with high wattage speakers or do I need to get something with a lower power rating?
Answers (1)
MichaelT
Staff Member
March 6th, 2018
You can go up in speaker wattage but you do not want to go down too low. 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" your speaker to its full potential and break it up. Some people like speaker breakup and some people don't, but using a high wattage speaker will not cause any damage.
Is there a cage I can use with this amp like the MOD101?
Answers (1)
MichaelT
Staff Member
March 6th, 2018
Yes, P-H1451-16 is a suitable cage that will fit the MOD102+. It is available here https://www.amplifiedparts.com/products/P-H1451-16
I want to build this and install it in a combo cabinet and would like to include a reverb tank, can I add a reverb tank and pot to this kit?
Answers (1)
MichaelT
Staff Member
April 16th, 2018
You would have to add the necessary circuitry and drill holes for the hardware and tube or tubes but it's certainly possible!
Verified Answer
Can use a 16ohm Speaker? And if so, what are the trade-offs?
Answers (2)
MichaelT
Staff Member
July 23rd, 2018
You can a 16 ohm speaker. The amp will break up sooner at lower volumes which can sound great. You will not get the full output of the amp though. To get the full range of volume you'd want to use an 8 ohm.
Verified Answer
Anonymous
March 6th, 2019
My Mod 102 sounds amazing running into 16 ohms
What would happen if you swapped out the preamp tube for one with a little less gain?
Answers (1)
MichaelT
Staff Member
July 23rd, 2018
I would expect some volume reduction with a little more clean as you turn up the volume pot. This is still a single ended amp so clean is relative of course.
Verified Answer
Can I use the headphone Jack mod from the MOD 102 instructions on this amp?
Answers (1)
MichaelT
Staff Member
August 28th, 2019
Yes, that same modification will work on the 102+.
Verified Answer
hi.Guitar Amp Kit,inr price ?Thank you,
Answers (1)
MichaelT
Staff Member
November 26th, 2018
All MOD Kits can be purchased from AmplifiedParts.com. https://www.amplifiedparts.com/products/amp-kit-mod-kits-mod102-guitar-amp
Verified Answer
The MOD-102 amp pin (3) and pin (4) on V2 are connected, the MOD-102+ amp pin (3) and pin (4) on V2 are not connected. Why? Thank you
Answers (1)
MichaelT
Staff Member
November 30th, 2018
This has to do with filament hum. On the 102 the cathode voltage is used as a reference whereas in the 102+ two 100 ohm resistors are used. Two different methods for accomplishing the same task.
Verified Answer
Would you happen to have a master volume version featuring 2 pre-amp tubes?
Answers (1)
MichaelT
Staff Member
December 3rd, 2018
We don't but I'd be happy to pass it along as a suggestion. Thanks!
Verified Answer
just want to say ....its brilliant ...scared of the process tho !!!! BRILL sound !!!!! well done !!!!!!!!
Answers (1)
MichaelT
Staff Member
December 10th, 2018
Thanks!
Verified Answer
Can the PT handle the addition of one 12_7?
Answers (1)
MichaelT
Staff Member
January 3rd, 2019
The filament supply of the transformer is rated for 2.5 A. We have never tested this but there is quite of bit of current.
Verified Answer
Also wondering why the caps in the power supply are different in the 102+
Answers (1)
MichaelT
Staff Member
March 8th, 2019
Increasing the capacitance in the power supply can help stiffen the power amp.
Verified Answer
There is a Grey wire coming out of the 269EX Power transformer but there seems to be no presence of that said wire on the instructions. Can you please tell me if I need the wire or were the wire goes.
Answers (1)
MichaelT
Staff Member
April 23rd, 2019
This wire is cut. It's covered on pg. 9 of the instructions and pg. 2 of the assembly drawings. "Pull the wire out as far as possible before cutting it as far inside the bell as possible."
Verified Answer
Can you recommend a supplier who makes a wood cabinet to put the mod 102 inside to protect it while Gigging...proper head cabinet etc...
Answers (1)
MichaelT
Staff Member
August 19th, 2019
We don't know of anyone making head cabinets for the 102+. I would check with local woodworkers to see if they could quote you one one.
Verified Answer
Is it possible to get this little amp to output to line level after the power amp? There are a few products from the likes of Fryette and Laney that do this, thus allowing easy recording of the full tube amp sound. What would such a mod require?
Answers (1)
MichaelT
Staff Member
September 9th, 2019
There are a few different ways to approach something like this. If you look at the headphone mod on the 102 page, that might be able to work although it might need some value changes depending on what levels your input is expecting. There are a lot of power amp attenuators sold today that take a more elegant approach and have circuitry that EQ's the signal and adds some cabinet simulation. Something like that might be a better option for recording.
Verified Answer
Do the capacitors in this amp have a bleed resistor to discharge?
Answers (1)
Anonymous
October 24th, 2019
The schematic shows a 220K before the standby switch and 470K after the standby switch across the HV smoothing capacitors.
Do you have documentation which explains the amplifiers circuitry design? The function of each component for learning/teaching and understanding purposes of this particular amplifier.
Answers (1)
MichaelT
Staff Member
November 22nd, 2019
We don't but that would be a cool idea!
Verified Answer
I was wondering if I could jumper off of the lugs on the SPST turbo switch, wire to an isolated jack, and then wire to a foot switch with isolated terminals. Looking at the schematic it seems that there are up to 126v that run through the switch, would this be safe if isolated, and would it risk introducing extra noise?
Answers (1)
MichaelT
Staff Member
December 10th, 2019
This would be a situation where a relay controlled with a footswitch would be more appropriate. The audio signal will need to run the length of your footswitch and noise could definitely be a problem.
Verified Answer
How feasible\difficult would it be to add a line level out or effects loop to this layout?
Answers (1)
MichaelT
Staff Member
December 26th, 2019
There are several different methods for adding an effects loop to an amp. While we haven't experimented with adding one to the 102, a "passive effects loop" would likely be the most simple approach.
Verified Answer
Could I use this as a bass amp? If not, is there a kit you offer or a mod I could do to make this useable as a bass amp?
Answers (1)
MichaelT
Staff Member
December 30th, 2019
We don't have an amp kit specifically for bass. The 102+ will work with a bass but only using a single EL84 power tube, it likely won't work great in live setting unless mic'd. Modifications to the tone stack could potentially improve the amp for use with bass but the wattage will still be limiting.
Verified Answer
Sorry. I just asked a question and forgot to leave my email! I wanted to know if this could be plugged in between a guitar and amp input for use as a pre amp. Peter Lamborn
Answers (1)
MichaelT
Staff Member
January 27th, 2020
This is a full guitar amp so it cannot plug into anything but a speaker.
Verified Answer
Is it possible to rectify the filament and lamp lines to DC? Will the amplifier still function as long as the voltage stays above 5.5v?
Answers (1)
MichaelT
Staff Member
January 27th, 2020
It's possible to power tubes with a DC filament but we have never experimented with this in the 102+ so we don't have any recommendations.
Verified Answer
On the 102+ amp I noticed a power output of 251v designated HV, however I do not see anywhere HV connects on the schematic. Can you explain what I am missing here?
Answers (1)
MichaelT
Staff Member
February 12th, 2020
That is the voltage coming directly out of the rectifier. It is filtered before connecting to elsewhere in the circuit to remove hum.
Verified Answer
What bumps it up to 8 watts from 5? Is it just the different pre-amp tube?
Answers (1)
MichaelT
Staff Member
March 3rd, 2020
The volume boost switch mostly bypasses the tone stack which reduces the amount of attenuation in that part of the circuit.
Verified Answer
Did I miss how to discharge the filter caps of high voltage before working on the amp? Can I use any discharge tool with a resistor on it?
Answers (0)

No answers yet!

Can I use a 10” 35 watt 8 ohm speaker with the 102+?
Answers (1)
MichaelT
Staff Member
March 23rd, 2020
Yes. Any 8 ohm speaker with a wattage greater than 16W will work. A 35W 10" speaker should work great with the amp.
Verified Answer
Can the transformer take an input of 240v 60Hz AC ?
Answers (1)
MichaelT
Staff Member
May 26th, 2020
The power transformer primary is rated at 115VAC 60Hz.
Verified Answer
Would it be possible to order this amp with a different transformer to accommodate a 10ohm speaker? Also would it be possible to add a master volume knob?
Answers (1)
MichaelT
Staff Member
June 5th, 2020
Thanks for the interest. The kits are only available in the stock configuration. Many people use a 16 ohm speaker with this amp and the stock transformer. We don't have a recommended mod for a master volume. It would be possible to add but you would need to experiment with it.
Verified Answer
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