Small Box Plexi '69 50 Lead - 50w Output

Product code: 14-JMPSB-1

Small Box Plexi '69 50 Lead - 50w Output

Power Output 50w

120v/240v - 50/60hz

Modulus Small Box 50 Kit Pick List: DOWNLOAD

Modulus Small Box 50 Suggested Layout: DOWNLOAD

Moving on from the Black Flag 50 models of 1967/68, the Small box Plexi feaured a stiffer power supply, Split cathodes on V1 for brighter bright channel, and changes to the tone stack to make the response thicker with more high mids and low mids, all coming together to create the sound of classic rock that so many guitarist still use as their core sound today.

We have tried to make the options above flexible enough to build the exact amp you want, but if you want some small differences please let us know, Our recommendation are as follows

  • High Spec: Sozo Coupling Caps, F&T Filters,Carbon film Resistors
  • Good Spec: Mallory Coupling Caps, Modulus Filter caps, Carbon film Resistors
  • Budget Spec: Yellow Modulus Coupling caps, Modulus Filter Caps, Carbon film Resistors

If you select to include valves we typically supply JJ Electronic valves with this kit

You can also select your faceplate colour and knobs, we make faceplate's to order so if you have any special requirements let us know and we will see what we can do to help.

Our transformers are high quality units based directly off real Drake transformers that we pulled apart to measure every detail, They meet modern safety and insulation requirements.

Cabinets are made to order and we will ship the complete kit with the cabinet. It is cheaper to buy the cabinet with the kit compared to purchasing it later.

Please e-mail us if you have any questions

Cant build an amp yourself, let us build it for you! check out our amp building service here. MODULUS AMP BUILDING SERVICE

Check out this awesome demo video Andy French made of the amp he built, check out his channel for loads of other amps and pedals that he has built from kits too.


Parts will be picked once the order is received and generally shipped within 3 to 10 working days from receipt of order. We try to keep all parts in stock to satisfy kit orders, however if there are part shortages that will take longer than 2 weeks we will contact you within 3 working days of placing the order, Please contact me for estimated shipping times prior to ordering if concerned.

Cabinets are made to order and shipped separately, dispatch times are typically 4 to 6 weeks for cabinets.

Condition New
Product Code 14-JMPSB-1
Weight 8kg