Repairing an Electro-Harmonix EHX Russian Big Muff Distortion Guitar FX Pedal
In this video I repair a broken Electro-Harmonix EHX Black Russian Big Muff circuit version 8 in the 3rd version (small) of the black enclosure, dating from 2001/02. One of the jacks and the battery clip needed replacing.
This pedal is a four stage transistor based fuzz circuit which we will explore in a future video.
00:00 Introduction
00:16 What's Wrong With It?
00:42 Disassembly
01:36 Transistor Identification - KT3102
01:50 The Plan
02:20 Repairs Start
03:37 Desoldering
07:47 Installing the New Jack
09:24 Testing the Repair
10:28 The Battery Clip
10:37 Reconnecting the Ground Lead
11:30 Testing It Again and Making a Mistake!
13:09 Replacing the Battery Clip
15:47 Testing It Again
16:25 Reassembly
17:23 A Quick Guitar Test (Telecaster, DIY Bench Amp)
17:59 Outro
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Пікірлер: 8
i actually happened to do the exact same repair to my black russian pedal. i replace both of the jacks and while i was there i also installed a boss style barrel jack. love the pedal, great job on the repair!
Awesome pedal. Great to see it brought back to life.
I'm just wondering because I don't know a lot about repairing boards. But, why did you add solder and then desolder the same solder points.
@MusicTechknowledgy
2 ай бұрын
Great question. It's because old solder almost always has a higher melting point, adding a bit of new solder lowers this melting point making desoldering easier. It's important, as too much heat can lift the PCB traces, especially on older style boards like this one.
Can you tell me where I can order that 6 prong input Jack for these please? Which part it is? Thanks
@MusicTechknowledgy
Ай бұрын
I actually had that one already and don't know where it came from but I can definitely find a suitable replacement. Bear with me, I'll need to check the pin spacing (so it fits in the PCB) and come back to you with a product link.
@MusicTechknowledgy
Ай бұрын
I can’t seem to find the exact one, I’m guessing being Soviet made has a slightly different spec. Closest I could find and should fit (based on measurement with the callipers) is a TruConnect one with 6.3mm pin spacing and 16.2mm between the pin rows. www.rapidonline.com/truconnect-3-pole-pcb-standard-jack-skt-20-1395
@kevindepetrillo
Ай бұрын
@@MusicTechknowledgy Thank You so much for taking the time to look into this. I highly appreciate it! I will try to order your recommended part. I will follow up and let you know how it goes! Thank you!! 😊