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Binary Rock

  1. 2012

2012-05-16 - Cow Pi Project

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  • I began designing my layout back in 2010

    I began designing my layout back in 2010

  • This is about as far as I got before getting caught up in other things

    This is about as far as I got before getting caught up in other things

  • Two years later, I return to the project and finally finish designing the layout

    Two years later, I return to the project and finally finish designing the layout

  • Finally it's time to build. Preparing to drill turret boards

    Finally it's time to build. Preparing to drill turret boards

  • Drill guides taped to boards

    Drill guides taped to boards

  • Drilling turret holes

    Drilling turret holes

  • Installing turrets

    Installing turrets

  • Making progress

    Making progress

  • All turrets installed

    All turrets installed

  • Preamp board completed

    Preamp board completed

  • Reverb section of main board done, working on power amp section

    Reverb section of main board done, working on power amp section

  • I love the symmetrical beauty of push-pull circuitry

    I love the symmetrical beauty of push-pull circuitry

  • Main board completed

    Main board completed

  • Center-punching the chassis, preparing to drill it

    Center-punching the chassis, preparing to drill it

  • Pilot holes drilled

    Pilot holes drilled

  • Drilling holes for the tube sockets

    Drilling holes for the tube sockets

  • All holes drilled

    All holes drilled

  • Using a spare drill plan to keep track of which holes have been drilled, and other notes

    Using a spare drill plan to keep track of which holes have been drilled, and other notes

  • Gavin keeps me company and works on his own project

    Gavin keeps me company and works on his own project

  • Preparing to cut the hole for the IEC power connector

    Preparing to cut the hole for the IEC power connector

  • All holes completed

    All holes completed

  • Ready to begin installing components

    Ready to begin installing components

  • Working on installing components

    Working on installing components

  • Wiring from the transformers etc is routed inside the chassis with rubber grommets

    Wiring from the transformers etc is routed inside the chassis with rubber grommets

  • Heater wiring installed

    Heater wiring installed

  • Big 25W resistor installed on the output jacks to help protect the amp in case it's ever powered on without a speaker connected

    Big 25W resistor installed on the output jacks to help protect the amp in case it's ever powered on without a speaker connected

  • Boards installed in the chassis

    Boards installed in the chassis

  • Transformers, choke, and rectifier and power tubes wired up

    Transformers, choke, and rectifier and power tubes wired up

  • After a few days of tedious work, all wiring is done. Not pictured: 5 days of debugging to solve a hum issue that ended up being an ungrounded output jack

    After a few days of tedious work, all wiring is done. Not pictured: 5 days of debugging to solve a hum issue that ended up being an ungrounded output jack

  • The completed amp

    The completed amp

  • Building a quick-and-dirty plywood cabinet so I can gig with the amp while I work on the "real" cab

    Building a quick-and-dirty plywood cabinet so I can gig with the amp while I work on the "real" cab

  • Cabinet completed and reverb tank mounted

    Cabinet completed and reverb tank mounted

  • The live setup: Cow Pi through Ampeg 2x12 for crunchy tones, Fender Hot Rod Deluxe for clean tones

    The live setup: Cow Pi through Ampeg 2x12 for crunchy tones, Fender Hot Rod Deluxe for clean tones

  • Rear view of cab. Still gotta zip tie the RCA cable for the reverb tank

    Rear view of cab. Still gotta zip tie the RCA cable for the reverb tank

  • Current pedalboard arrangement. Homemade Sir Mix-a-lot pedal mixes my guitar and keyboard signals at the input, various homemade and commercial pedals in between, and the Boss Line Switcher switches between the two amps at the output

    Current pedalboard arrangement. Homemade Sir Mix-a-lot pedal mixes my guitar and keyboard signals at the input, various homemade and commercial pedals in between, and the Boss Line Switcher switches between the two amps at the output

  • Now with a formal name

    Now with a formal name

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    This is about as far as I got before getting caught up in other things
    Two years later, I return to the project and finally finish designing the layout
    Finally it's time to build. Preparing to drill turret boards