1976 Electro Harmonix BIG MUFF PI Fuzz: Low Output Volume REPAIR & MODS

In this video we will show the ENTIRE troubleshooting and repair process on a vintage 1970s guitar pedal - the Big Muff Pi. This one was completely dead, not passing any signal when switched ON. We will fix that issue and then fix the issue of extremely LOW OUTPUT, LOW VOLUME, which seems to be a common thing with many of these 70s Big Muffs. We will look at the BC239 transistor and 1N4148 clipping diode circuit and schematic along the way and discuss what many of the circuit components do and how they work to shape the sound. Finally, in our usual fashion, we will demo the completed pedal through my Dinosaur solid state bench amp, because it's kinda funny.
Thanks to the following website for their helpful information: http://www.kitrae.net/music/big_muff_guts.html

SUBSCRIBE TO CHANNEL 2: http://bit.ly/Guitologist2
*SHOW YOUR SUPPORT*
1: Donate via Paypal: https://paypal.me/guitologist?locale.x=en_US
2: Buy Merch: http://bit.ly/GuitologistMerch
3: Send in Viewer Mail. (Contact Me for details at [email protected] )
4: Purchase an ad! (Rate sheets available upon request at email above.)
5: Buy something from a sponsor and tell them I sent you.
6: Stand in the middle of the street naked screaming "LONG LIVE THE GUITOLOGIST!" Then when the cops arrive, tell them about my channel.

♠STUFF I USE
-Mustool Handheld Oscilloscope: https://usa.banggood.com/custlink/DKDY7N94Gf
-5A Variac: http://amzn.to/2FNWthU
-Jameco Isolation Transformer: https://amzn.to/2PRv1Fa
-Fluke 87: http://amzn.to/2DwHjvr
-Yotec 936 Soldering Station: http://bit.ly/2JqB1Vw
-Sealody SSA51 soldering station: http://amzn.to/2DJTS7P
-Black and Decker Heat Gun: http://amzn.to/2DWpDhr
-Geekcreit® LCR-T4 Mega328 Transistor Tester http://bit.ly/2J9uLSA
-HT02 Handheld Infrared Thermal Camera http://bit.ly/2LXfLoD
-Solderless Breadboard: http://bit.ly/2stkVAq
-Breadboard Jumper Wires: http://bit.ly/2JowaEh
-Geekcreit® XR2206 Function Signal Generator DIY Kit http://bit.ly/2LYBvkb
-Contact Cleaner: http://amzn.to/2FVitro
-Max Professional Cleaner and Lubricant: https://amzn.to/37R3JY8
-Deoxit Fader Cleaner: https://amzn.to/2LPwtsE
♠RECORDING
-Sony AX53 Camcorder https://amzn.to/3MznuYp
-Canon HF M500 Camcorder https://amzn.to/3khlV5x
-Andonstar USB Microscope: https://bit.ly/2q8QIWz
-Articulated Boom Arm with Cam Mount: https://amzn.to/2Hlo2AX
-Shure Beta 87A https://amzn.to/2rNPnoW
-EV 635A Omnidirectional Dynamic Mic https://amzn.to/2pR8HQT
-sE Electronics VR1 Ribbon Mic https://amzn.to/3vkfMM8
-Tonor Q9 USB Condenser (for voiceovers) https://amzn.to/39fvmQp
♠RECOMMENDED BOOKS
-RCA TUBE MANUAL http://amzn.to/2GOBVqS
-DESIGN AND CONSTRUCTION OF TUBE AMPLIFIERS: http://amzn.to/2HSNMne
-Designing Tube Preamps for Guitar and Bass: http://amzn.to/2DK5tmt

#electronics #repair #guitar