I spent 34 years at Tektronix working in all parts of the company - computer graphics, video and networking, and test and measurement (my professional information is on my LinkedIn page). I've since retired to enjoy my hobbies and I now have the time to devote to my music projects. I have the time and interest to be able to help and assist fellow Synth-DIY'ers with their projects and formed Modular Synthesis, LLC to help. Contact me if I can consult or be of help or assistance with your project, repair, design, or restoration.
Many of the items that are sent to me for repairs are old and have limited or no technical documentation. Some of the parts are unobtanium or fragile. If parts are not available, I may be able to modify the design to use different parts. However, when I am working on a vintage repair, one of four things can happen:
1. I can work on it and am unable to repair it.
2. I can work on it and something else can go wrong.
3. I can work on it, repair it, return it, and it can break again, possibly soon.
4. I can work on it, repair it, and it will work fine.
I have had only two products that I have been unable to repair and they were both mine. One is my second Peavey DPM-C8 with a lot of PCB damage. I haven't given up yet but need to ohm out the entire PCB. The other was a keyboard with flex circuits that deteriorated. I managed to repair some of them with silver conductive paint but decided it just wasn't worth the effort to complete. I do keep you informed via email of my progress and you can direct my repairs to minimize cost.
For DIY repairs, the number one problem I find is soldering issues - unsoldered pins, incomplete soldering, or solder bridges. You have to wash and carefully inspect every pad with magnification to find these. I have added tips and information on my Modular Synth Tips page for soldering, cleaning, and inspecting PCBs as well as proper packing for module shipment. Hopefully these tips may save you some time and grief. Unfortunately I also encounter design errors and insufficient margin as well. These do take more time to find and correct.
|I have recent experience repairing these modules and music equipment:|
Aries AR-312 EG, AR-314 VCF, AR-316 VCA, AR-317 VCO, AR-318 S&H, AR-324 dual LFO, AR-328 spring reverb and output, AR-332 Dual VCO
ARP avatar, odyssey, and sequencer, ARP-4072 clone VCF
ASM-1 VCO option 3
Barton Quad VCA
Blacet time machine
Boss DDR-55 drum machine
Buchla 208 music easel, 216 touch controlled voltage source, 227 system interface, 230 triple envelope follower, 245 sequential voltage source, 259 complex oscillator, 266 source of uncertainty, 281 quad function generator, 291 dual voltage controlled filter, 292C quad low pass gate, 296 programmed spectral processor, RSF Kobol dual vco, 402 quad dual lfo
CGS Bi-N-Tic filter, CGS-26 cv processor, CGS-29 wave multiplier, CGS-31 digital noise, CGS-35 Synthacon VCF, CGS-48 VCO, CGS-49 wasp filter, CGS-58 utility LFO, CGS-62 slope detector, CGS-113 wavefolder, CGS-114 dual universal slope generator
Doepfer A-138 matrix mixer
EFM Bassace monosynth
Ensoniq EPS-16+ and mirage keyboards
Experience effects pedal
Fender most anything vintage ...
Fonitronic MH21 Triple Resonator and ALM003 SID GUTS
Fostex 3180 reverb
Fritz 5pulser, threeler filter, TZ-FM VCO
Greistleizer effects pedal
Jürgen Haible polymoog resonator, tau phaser, vibrato scanner, frequency shifter, variable slope filter/phaser
JVC TT-81 and TT-101 turntables
L-1 VC Resonant EQ
Loft 450 delay/flanger
"Miss Ten" VCF/VCA
Modcan 4075 VCF
Moog 901 VCO, 901A & 901B VCO, 902 VCA, 903A Noise, 904A, 904B, & 904C VCF, 905 reverb, 907 fixed filter bank, 911 EG, 911-A dual trig, 912 EF, 914 fixed filter bank, 921 VCO, 921A & 921B VCO, 960, 961, & 962 sequencer, 984 four channel mixer, 992 control voltages, 993 trigger and envelope voltages, CP-2, CP-3A, CP-4A, CP-8A, 961CP, 930 power supply, 951 keyboard
Moog Source and Sonic Six
Oakley SVCO, ADSR/VCA, TB-3030
Papareil Polivoks filter and quantix8
Peavey DPM4 & DPM-C8 keyboards
René Schmitz MS20 filter
Roland RE-301 chorus-echo, 112 2VCO, 140 2ENV-LFO, 172 Phaser Shifter/Audio Delay/Gate Delay
Sequential Circuits Inc model 700 programmer, model 800 sequencer
Serge (many modules)
Sony TA-E88 preamp, TAN-511 amplifier
Sputnik Modular (many modules)
Tellun TLN-156 reverb
Thomas Henry X-4046 VCO
Yamaha DX7 keyboard
Yocto TR-808 clone
YUSynth S&H, ARP4072 filter
Wersi CX-2 rhythm & accompaniment
... and of course any modules I have built and my instruments that I have repaired
Here are some sample projects that I have helped with.