Sunday, 29 October 2017

Friedman Dirty Shirley

Original info:
"The Friedman Dirty Shirley all-tube amp is well known for being one of the most flexible and touch-responsive single-channel amplifiers on the market. Now you can get that same tonal versatility, sensitivity and harmonically rich overdrive in a pedal. The Dirty Shirley Overdrive packs the same intuitive control set as the amplifier, allowing you to dial in your perfect shade of rock in no time. It doesn't matter if you want a high-output cleaner tone for pushing your amp hard or a thick gritty drive that will sit well in any classic to modern rock band, a sweep of the gain control easily gets you there. If you ever want reign in the low end, for a punchier feel, simply flip the side-mounted Tight switch and away you go. If you want to experience the amp’s accolade-garnering tone in the convenience of a pedal, put the Dirty Shirley Overdrive on your board today.
British rock at its best
Though the Dirty Shirley overdrive can scream with an unabashedly rock 'n' roll voice, you'll be surprised at how truly versatile it is. To get more out of the amp you already have, roll the pedal's gain knob back, crank the volume and get a killer dirty boost. And of course, roll up the gain and witness how well the pedal responds to every touch and manipulation of your guitar's controls.
● Friedman Dirty Shirley amp tone in a compact pedal format
● Responds to guitar controls and picking nuance exactly like the amp
● Gain control takes you from gritty to hard rock in no time

Ready for your rig
The Dirty Shirley Overdrive pedal delivers tube like tone in a small pedal format which can be used either into a clean amp or to boost an already over-driven amp. If your amp, or other overdrive gets a bit loose in the low end, throw ON the Dirty Shirley's Tight switch to bring back the percussive attack you crave
Original FSB thread and schematic available here.


  1. Thank you Alex!!! Difficult but well worth it. Really appreciate your hard work and your willingness to share it.


  2. Another great job! Thanks Alex, I do notice a 3k9 resistor floating on a jumper, i presume it should be somewhere else?

    1. Bloody mouse!
      Corrected. Thanks.

  3. Looks like it should fit between the 18k an the 1M looking at the schematic.

  4. That 3k9 should go from Vref to Tight Switch 2

  5. Wouhou!!!!!
    Great work, thx so much for all these great layouts
    BTW I just finished building my second BE-OD
    with BAV99 smd from Tayda, sounds great

    and Gutshot

    1. What a nice build! And I just love the design of the box! Well done!

  6. Verified!!!
    Working perfectly,
    Lower gain than BE-OD, But still loud.
    I have to box it properly and I will post some pics ;-)
    again thx a lot Alex, great work !

  7. Just built it and...
    What a great pedal !!!
    Thanks Alex !

  8. Thanks for sharing, nice post!

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  9. Finished and working at the first attempt! Just the volume seems too loud...Anybody else got the same problem?

  10. Finished one here too... Well it's got plenty of gain, it will rip your face off. Sounds great with every setting.