Synth Repair Services

Since I'm no longer part of Analog Sweden I'm offering my services for vintage synth repairs, if you had a repair done there over the past 20 months then you'll already know my work.

I'm offering very competitive rates and to get the ball rolling I will beat any competitors quote. So if you are in need of any kind of analog synth repair work drop me a line on info@dinsync.info and let me know what the problem is you are having. I'll get right back to you with my thoughts on what to do or how much it may cost to repair.

I've lots of experience with vintage gear, here's a list of just some of the machines I've worked on over the last 12 months

Arp 2600
Arp Odyssey MKI/MKII/MKIII
Jen SX-2000
Korg MS-10
Korg MS-20
Korg MS-50
Korg SQ-10
Korg 900ps
Korg Trident
Korg Polysix
Korg Monopoly
Moog Minimoog
Moog Memorymoog
Oberheim Four Voice/Eight Voice/SEM
Oberheim OBX
Oberheim OBXa
Roland Juno-106
Roland JX3P
Roland MC-202
Roland SH-101
Roland SH-2000
Roland System 100 - 101
Roland System 100 - 102
Roland TB-303
Roland TR-606
Roland TR-808
Roland TR-909
Roland VP-330
Sequential Circuits Pro One
Sequential Circuits Prophet 5
Sequential Circuits Prophet 2000
Sequential Circuits Prophet T8
Sequential Circuits Prophet VS
Yamaha CS-60
Yamaha CS-70

Roland SH-101 Modifications

You can wire the LFO outputs direct from the rear of the LFO selection knob at these points. Wire the tip of the jack to the point in question and wire the sleeve of the jack to a convienient ground.



You can wire the oscillator outputs direct from the rear of the source mixer faders at these points. Wire the tip of the jack to the point in question and wire the sleeve of the jack to a convienient ground, with the VCF cutoff cv, add a 100k resistor in line to the tip of the jack. To wire up the triange output, simply wire the tip of the jack to pin 10 on the CEM3340 ic. (this is done exactly the same as it is for the MC202 vesrion of this mod, details here)



work in progress...



all done.

6th September UPDATE



I added this picture of my ground wire (red wire center of the pic.) As you can see theres a nice little ground symbol marked on the control board. I found this to be the best place to take ground from for this mod. Also your connection wires should be shielded wire, leave the ground floating at the pcb end (you'll see mine have some heat shrink tubing to insulate the shield from touching the board and connect the shield at the jack end, this will create nice little rf jackets for your "live" wires. If you don't use shielded wire you'll end up with some bleed through from the circuits.

DIY Eurorack Modules

I hope you are having a nice summer holiday, anyway in my spare time I've made a few modules for my Eurorack. The inspiration for these came from a Quad Slew design from navs modular lab blog. In that article I came across a link to a DIY page by Doepfer which I hadn't seen before. There's plenty of simple projects there and so I set to work and ended up building a Quad Slew, a Dual Inverter, a CV Amplifier, an Audio Mixer and an expansion port for my A-137-2 Wave Multiplier II. And here's the result.

There's some discussion about the Quad Slew over on the Muff Wigglers Forum

Here's some pictures I took during the build.



The blind panels after drilling



All the hardware mounted (but not yet wired)



Wiring up the Mixer.



Side view of the Mixer, as you can see I glued the opamp to the back of a pot.



Wiring up the Quad Slew.



Wiring up the Dual Inverter / CV Amplifier.



Side view of the Dual Inverter / CV Amplifier, again the opamp is glued to a pot.



Here's what my modular looks like now with the new modules labeled and installed.

TR-606 and TR-808 pattern sheets

After last weeks post DanG kindly made some more excellent pattern sheets. This time there's one for the TR-606 and two for the TR-808. The TR-808 ones are for 16 or 32 steps, so now you can backup all your patterns. Simply download the sheets and print them out.

TB-303 Pattern Sheet

Here's a really nice pdf pattern sheet which I got from Dylab, you can download and print out. It has room for all your patch data so you can backup all your favorite basslines, very nice indeed.

Be sure to visit DyLab's blog for more TB-303 related topics.

The sheet was orignally designed by DanG who visits here and had this to add.

I designed those many years ago in Visio and gave them away to peff to distribute. I'm glad someone still finds them useful. :)

You can find the original posting along with a 4 pattern per page version at the bottom of peff's Synthesis Archive page here: