MOD 101 Guitar Amp Kit

60 watt vacuum tube amp kit. The MOD 101 Amp Kit measures 8 1/8" in height, 19" in width (including handles), chassis width is 16", depth is 8". Overall weight of assembled amp kit is 23.7 lbs. Comes with complete instructions for putting together kit as well as detailing 32 circuit variations including: Tone Stack Mod, Input Voltage Divider Mod, Negative Feedback Mod, Bypass Cap Mod & Power Tube Mod.

MOD 101 Guitar Amp Kit Features

  • All Tube Design (solid-state diodes used only for full-wave rectification)
  • 60W output power into 4, 8, 16 and 20 Ω
  • 1 channel with customizable: tone stack, power tubes, negative feedback, input miller capacitance volt divider/LP filter, and preamp cathode bypass cap (all parts included)
  • Vintage channel controls: bass, treble and volume
  • Vintage pilot lamp and screw-on jewel cover for power-on indication
  • DPDT power switch circuit for instant high-voltage drain in power-off
  • Standby Switch
  • Output Impedance Selector Switch: 4, 8, 16 and 20 Ω
  • Tubes included: one 12AX7 (preamp), one 12AT7 (phase inverter), one matched pair of 6L6GCs and one matched pair of EL34s (JJ Electronic brand)
  • Hammond Mfg 374BX world power transformer and 1650P push-pull output transformer
  • Fixed bias class AB power tube operation with bias pot adjustment
  • Point to point hand wiring using terminal strips
  • Carbon film resistors
  • Mallory coupling caps
  • Pre-punched painted steel chassis
  • Assembled Kit Weight: 24 lbs.
  • Assembled Kit Dimensions: 16" Width x 8" Depth x 8 1/8" Height

MOD 101 Instructional Features:

  • Detailed, easy to follow instructions include high resolution computer drawings for parts list and every step of assembly
  • Tips for soldering and wiring
  • On-line technical support

Here is what people are saying about MOD 101 Guitar Amp Kit

"This kit was my first amp build. I had fun and learned a lot while putting it together. Now I have a great time gigging with it!" "This is a nice amp. The kit was fun to build and the instructions were great!" "I've been wanting to learn to to build my own tube amp for a long time but had no idea where to start. The MOD 101 has been my gateway to DIY amp building."

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.
Does this amp have an effects loop?
Answers (1)
MichaelT
Staff Member
March 6th, 2018
This amp does not have an effects loop, but it sounds great with pedals and should give you plenty of clean headroom. These kits are designed with modding in mind, so if you'd like to add an FX loop we can recommend the book "How to Service Your Own Tube Amp" by Tom Mitchell, which has a great section detailing how to add an FX loop to your amp. This book is available here: https://www.amplifiedparts.com/products/B-707
Can I swap out the tubes for another brand?
Answers (1)
MichaelT
Staff Member
March 6th, 2018
Yes, we encourage you to experiment with different tubes to find what you think sounds best.
What does it mean if I'm hearing a very loud low frequency hum when I turn my Mod 101 on?
Answers (1)
MichaelT
Staff Member
March 6th, 2018
A low 60 Hz hum can be the result of the power transformer's filament winding center tap (TR1 green/yellow wire) coming loose. Check to make sure this wire is connected properly and not just hanging on by a cold solder joint. Another possibility is a faulty tube in V1. Sometimes a bad preamp tube will amplify the filament's AC frequency. Try removing the tube in V1 (ECC83) to see if the hum goes away.
I live in the UK, does the power transformer for the Mod 101 work for 220V, 50Hz?
Answers (1)
MichaelT
Staff Member
March 7th, 2018
This amp kit uses a Hammond Manufacturing "300" Series world power transformer. It can be wired for the various voltages used around the world, though we only provide instructions for United States wiring (120V, 60Hz).
How loud is this amp?
Answers (1)
MichaelT
Staff Member
March 7th, 2018
60W of power output can be quite loud – this amp is capable of providing more than enough sound for gigging in smaller venues and large jam sessions. It can be kept at bedroom levels when using lower volume, a power attenuator, or modifying it using the “Master volume mod” found in the file downloads section.
Do the power tubes need to be biased?
Answers (1)
MichaelT
Staff Member
March 7th, 2018
Yes, the power amp is fixed biased for Class AB operation with an adjustable bias pot. The instructions will guide you through setting the bias for both 6L6GC and EL34 power tubes.
Does this use a tube rectifier or solid state?
Answers (1)
MichaelT
Staff Member
March 7th, 2018
The MOD101 uses a solid state rectifier.
Can I use power tubes other than the 6L6GCs and EL34s?
Answers (1)
MichaelT
Staff Member
March 7th, 2018
Yes, the following power tubes can be substituted: 6L6GC substitutions: 5881 and KT66 EL34/6CA7 substitutions: KT88 and KT77
Do you offer an assembly manual?
Answers (1)
MichaelT
Staff Member
August 3rd, 2018
The links above include the build instructions, schematics, and more.
Verified Answer
Is it true that if I built my 101 for EL34’s I can switch to the 6L6’s as long as I bias correctly?
Answers (2)
MichaelT
Staff Member
October 22nd, 2018
You can do this this if it is biased correctly. There will be some effect on the tone using the 1K resistors with the 6L6 tubes.
Verified Answer
Anonymous
March 22nd, 2019
My answer to this question is... Why would you want to swap out EL34s? This amp has the potential of producing one of the greatest known tones in Rock history. Theoretically, this could sound like a Marshall Plexi. In my opinion, the best hard rock/heavy metal tone from 1970 to 1980. I'm not trying to be a troll here. Just pointing out that EL34 tubes are a big player in EVH "Brown Sound"... Just saying...
Does it come with speakers ?
Answers (2)
Anonymous
December 16th, 2018
No
Anonymous
January 10th, 2019
This is an amp, but not a combo and does not have a cabinet.
Can this Amp be mounted into a cabinet with the Controls Panel "facing up"? This would put the valves being "side mounted". Will the Butterfly Type clips be sufficient to hold them? Many Thanks! This looks to be a Great Project!
Answers (1)
MichaelT
Staff Member
November 15th, 2018
That shouldn't be an issue. The only thing that will be a problem is that the control labels will be upside down but you could always leave them off or DIY some that'll work.
Verified Answer
Hi Can we power down the amp to 15W with the same tranformers and tubes? The idea is to have a limit for home practice and power up to 60W to band practice Best regards,
Answers (1)
MichaelT
Staff Member
February 14th, 2019
We don't have any suggested mods for this although it could be possible. An easy solution would be to use a power attenuator.
Verified Answer
Hi Is it possible to limit the power input as well as the power output swapping some components? For example a 50W power input
Answers (0)

No answers yet!

Can I order a mod 101 kit without the chassis?
Answers (1)
MichaelT
Staff Member
March 18th, 2019
We only sell complete kits but if you use the part numbers listed in the BOM at Amplified Parts you should be able to order all of the necessary components.
Verified Answer
Can I change the glass fuse by a resettable fuse?
Answers (1)
MichaelT
Staff Member
March 22nd, 2019
We never tried this type of fuse on a tube amp but I would imagine if the specs are exactly the same then there shouldn't be an issue.
Verified Answer
I cannot find a price for the MOD 101 Guitar Amp Kit.
Answers (1)
MichaelT
Staff Member
June 4th, 2019
You can click the link above "Click Here to Order" for pricing or copy this link here: https://www.amplifiedparts.com/products/amp-kit-mod-kits-mod101-guitar-amplifier
Verified Answer
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