MOD 101 Guitar Amp Kit

Product Files

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
Was this helpful?
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.
Was this helpful?
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.
Was this helpful?
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).
Was this helpful?
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.
Was this helpful?
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.
Was this helpful?
Does this use a tube rectifier or solid state?
Answers (1)
MichaelT
Staff Member
March 7th, 2018
The MOD101 uses a solid state rectifier.
Was this helpful?
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
Was this helpful?
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
Was this helpful?
Have a question of your own? Ask us here!