Bernard d’Uur’s little lab; doctor is in!

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A blog about vintage amps, pedals and their working. For over 20 years I’ve been dissecting amps, pedals and guitars to see what makes them tick! And I love a good mystery! So dive together with me in the information I can dig up from various places (both digital and analog) to tell you more on the units I work on. My main addictions are Fuzz pedals, Chorus pedals and 50’s amps. And the rarer, the better

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Articles of interest

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  • The Ibanez PT-900 and PT-999; the beginning

    The Ibanez PT-900 and PT-999; the beginning

    Ibanez introduced the PT-900 in 1974 as its first effect pedal that was sold nationally as internationally. Inside mimicking the MXR phase 90 and housed in a blue box, it was an instant succes.…

  • The Ibanez Overdrive II; the father of a well known pedal!

    The Ibanez Overdrive II; the father of a well known pedal!

    This baby came in before and I LOVED it!  This Ibanez Overdrive II (also called the OD-855) is a very early overdrive pedal that was made for Ibanez by Maxon. The Overdrive I came…

  • MAStex Lesli Elektro Hamonix Phpse Shifter; Turkish delight!

    MAStex Lesli Elektro Hamonix Phpse Shifter; Turkish delight!

    I love weird pedals. And this is one weird pedal! This MAStex Lesli pedal is a Turkish pedal. When it came in, it was a mess. It didn’t do anything. It was ‘worked on’…

  • Voodoolabs – Tremolo (4 knob version)

    Voodoolabs – Tremolo (4 knob version)

    This pedal came in for some TLC. Multiple versions were made with two and three knobs, although the 4 knobbed version is the most common.  Voodoolabs produced this to emulate the sound of a…

  • CMOD OD; my own take on a classic!

    CMOD OD; my own take on a classic!

    Sometimes I try to design something for myself.  So to end the CMOS OD appreciation for now, I give you this. A CMOS OD box for cleanish boosts, EQ’ed boosts, low gain or a…

  • Snarling Dogs – Black Dog

    Snarling Dogs – Black Dog

    Did I mention that I love CMOS overdrives?This beauty came in a long time ago,  This Snarling Dogs Black Dog was build in the USA by Charlie Stringer. It is an EHX Hot Tubes…

  • Monarch – MTO-22 Tube Driver

    Monarch – MTO-22 Tube Driver

    CMOS overdrive appreciation post number three: the Monarch MTO-22 Tubedriver. This beauty was sold under different names and brands as it is also known as the Aria ATO-1 Tube Overdrive, the Ken Multi MTO-7…

  • EHX – Hot Tubes CMOS overdrive – Nano

    EHX – Hot Tubes CMOS overdrive – Nano

    After my former post people asked me about the Nano version of the EHX Hot Tubes CMOS Overdrive pedal. Prior to this I already published the schematic at Freestompboxes.org.   This pedal is a…

  • EHX – Hot Tubes CMOS overdrive

    EHX – Hot Tubes CMOS overdrive

    Recently this pedal came to my door. I’ve always been a big fan of the EHX Hot Tubes pedal and CMOS overdrive pedals, but this little unit just sounds even better. The EHX Hot…