Showing posts with label Synth Techs. Show all posts
Showing posts with label Synth Techs. Show all posts

Friday, March 08, 2024

What Is All That Stuff Inside A Polymoog (by synthpro)

video upload by synthpro

"This is a video I felt it was time to make going over the polymoog more in depth technically to go hand in hand with @AlexBallMusic's post on the Polymoog synthesizer."

See Alex Ball's Polymoog video here: That Gary Numan Synth. Update:

Dillan's Polymoog 203a Demo (by synthpro)

SN 1244

Saturday, February 10, 2024

Sequential Circuits Pro One Synthesizer + Drumtraks DEMO for Trevor

video upload by Synth Tailor Electronics

"Here's a Sequential Circuits Pro One that was overhauled and upgraded by Synth Tailor Electronics in Columbus, Ohio. Visit our website to get in touch for repairing your vintage synths, drum machines, tape machines, and outboard gear. We service vintage items made before 1991!

Restorations done:
-Installed Fatar TP/9S keybed from TechsMechs Vintage Synth (potentiometer Prophet 5 caps from TechsMechs as well)
-MTG Turbo CPU Midi Upgrade installed
-Potentiometers cleaned/ new pots installed
-Power Supply Rebuilt and Full Calibration/Tuning"

Tuesday, February 06, 2024

Moog Prodigy Synthesizer SN 5565

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

"Unit has been serviced by Synth Tailor Electronics and comes with their standard one year warranty (see warranty details below)

Restorations performed:

-All Pots disassembled, cleaned and re-greased

-Power Supply Rebuilt (Capacitors, Diodes)

-Black Leg Op Amps replaced (common with this era)

-Keybed Disassembled, ran through ultrasonic cleaner and contacts cleaned.

-Cosmetically cleaned inside and out

-Full Calibration and Tuning"

Saturday, December 09, 2023

EXTREMELY RARE PPG 1002 for Tom + first ever shop tour!!!

video upload by foleytronics fx repair

"Here is a demo of the EXTREMELY RARE PPG 1002 for Tom. Plus a bonus first ever tour of the Foleytronics shop!!

For those that want to attempt to tune this synth, here is what worked for me:

The trimmer by the regulators is the CV offset; trim for 0v for the lowest key. This interacts with the CV v/oct, which is right above where the two shielded cables connect from the 20-pin keyboard connector. Trim this for 1v/oct, which can be measured at the switched oscillator CV input jack on the back of the instrument. Once these are set, you can move on.

The oscillators are tricky. They each have an initial frequency trim pot and a volt/octave trim pot. However, the initial frequency trimmer cannot be set willy nilly to A440 because their initial tuning frequency greatly affects the octave selection switches on the top panel. What I found to be most effective is to set the MASTER TUNE front panel pot to 0, the OCTAVE SLIDER to the left of the keyboard to the middle and then begin tuning. Note, every trim pot for each oscillator will affect the others for that oscillator so this is an exercise in extreme patience.

First, turn off keyboard control for OSC B and roughly center its front panel tuning pot; set its octave to +3 and put a folded piece of paper on middle C. You are now going to tune the octave selector for OSC A; this part is confusing as there is a trimmer to adjust the octave selection offset for BOTH oscillators, but only OSC B has an adjustment to “match” its octave selection with that of A. Thus, you have to use that trimmer to get OSC A perfect and then match B to A - the method that worked for me was to switch between octaves for OSC A and adjust the octave offset trimmer along with the initial frequency trim pot for A to get a perfect octave selection for OSC A over the OSC B drone.

After the OSC A octave adjustment, it’s time to adjust B’s octave adjustment. Set A to +3, and switch OSC B to +1; adjust for zero beating at the trimmer in the upper left corner of the board right at the edge of the PCB. Then, switch OSC B back to +3 and adjust its initial frequency for zero beating; repeat this until the octave selection is perfect for B.

Now, it’s time to adjust for V/octave for each oscillator. Sadly, this adjustment affects the octave center calibration we just did, so you’ll have to keep backtracking until it’s good. Adjust the V/octave trim pot for OSC A, which is directly to the left of the CV v/octave we did in the first step. You’ll now have to mess with the init. frequency for A along with the V/oct to get the oscillator to track correctly on the keyboard, but like I said earlier, you have now probably slightly messed up the octave selection so you will have to go back and do that again. Then, adjust the tuning of OSC A again and repeat this process until OSC A tracks perfectly and has good octave selection. I couldn’t really get the +4 octave to be perfect, but hey, it’s a prototype and is probably 50+ years old.

Now for OSC B; it’s very similar to A. Use the V/octave adjustment trimmer which is the lower left trim pot on the PCB along with the initial frequency trim pot to get B to track along the keyboard. Again, you’ll have to go back and adjust the octave selection, but that’s not as bad for B because its octave adjustment doesn’t mess up OSC A’s octave selection. At this point, you should be able to get OSC A and OSC B to track the keyboard and the octave selections should be there"

Thursday, November 23, 2023

Sequential Circuits Pro-One for John

video upload by foleytronics fx repair

Roland Jupiter-8 for Tyler

video upload by foleytronics fx repair

"Here is a demo of the Roland Jupiter-8 with a CR-78 and SRE-555 chorus echo. This JP8 had an interesting problem that many units with Encore MIDI have: an annoying click sound when moving any of the programmable sliders. It has since been solved and repaired and sounds lovely as ever!"

Arp Quadra for Randy

video upload by foleytronics fx repair

"Foleytronics is a repair shop in the Cincinnati area (Dayton, KY) specializing in vintage FX, drum machines, synthesizers, tape machines and vintage pro audio. Every shipped item gets a video demonstration as assurance for the client, insurance for both of us and documentation of these cool old machines for the rest of the world."

IG: foleytronics_llc

Tuesday, September 12, 2023

Akai VX-600 // restored by VS&C

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

"The VX600 is a compact analog synthesizer from Akai. It features 6 voices, with 2 analog VCOs per voice. A highly flexible modulation matrix allows you to route the waveforms of each VCO through various editing functions. There is a resonant low-pass filter, a high-pass filter, two LFOs, three envelope generators, two external audio inputs, and more. The memory can store over 100 patches, each of which can contain key split divisions, MIDI information, and voice allocation."

Sunday, August 27, 2023

Prophet VS in for a major service

video upload by Espen Kraft

"I finally gave the VS some TLC. It's been sitting there unused for quite some time due to very glitchy buttons, a almost unreadable display and a PSU that was on it's last dying breath.
A new PSU, new display, a new set of switches were among my priorities leaving this with my tech.

I wearing a t-shirt from

The power supply that's been installed can be found here:

The rest of the new components can be found with the help of Google. ;-)

A big thanks to the tech Trond Gribbestad Lund for good work, and to Anders Jensen for taking a Saturday off to shoot the tech at work. Thanks guys!"

Tuesday, August 22, 2023

Rob Rosen Reveals His Ultimate Synth Collection

video upload by Anthony Marinelli Music

A look inside the Yamaha CS80, the 14th ever made Sequential Prophet-5, a Rev 1, and a Roland Juno-106, touching on some of the evolution of analog synthesis technology over the years.

"I hope you enjoy this rare opportunity to visit with my close friend Rob Rosen for a deep dive into his ultimate vintage synth collection. Together, we’ll see inside some of the rarest synthesizers of all-time and learn from this master technician how synthesizers have evolved, what makes them tick and why synthesizers make such cool sounds!

I consider Rob’s shop @Rosen Sound ground zero for anything relating to synthesizers. It’s also the biggest wonderland of vintage synths in perfect working order that you’ll ever see .

Rob is a self-taught technician and is now the world leader for repair, restoration, custom manufacturing and sales of vintage synthesizers. He’s also quite an accomplished musician programmer and keyboard player as well."

Chapter Time Stamps:
00:00:01 Intro Anthony on the street in Burbank, CA
00:01:55 Entering Inside Rosen Sound
00:02:06 Meeting “P” from Chromeo and The Rosen Sound Team
00:03:06 Rob shows us his personal work space
00:11:42 Montage of Synths - Start
00:12:35 Montage of Synths - End
00:12:36 Anthony and Rob in “The Cabin” - a wonderland of vintage synths
00:13:42 Anthony explains and demonstrates features on the CS-80
00:20:36 CS-80 “Under the Hood” in-depth tour by Rob
00:53:31 Prophet 5 “Under the Hood” in-depth tour by Rob
01:12:50 Anthony Demonstrates some of the Juno 106 sounds
01:19:27 Juno-106 “Under the Hood” in-depth tour by Rob
01:28:54 One-of-a-Kind Oberheim Modular 8 Voice System tour by Rob
01:35:31 Anthony asks Rob 20 Questions about Synthesizers
01:39:09 Rob asks Anthony some Questions about Synthesizers
01:49:47 Bass Shootout: 1973 Moog System 55 VS ARP 2600
01:54:54 Shoot Out Conclusion and Bass Tips

Wednesday, July 19, 2023

Another Oberheim Four Voice Synthesizer FVS Repair - Synthchaser #156

video upload by Synthchaser

"Last year I did a three part video series repairing an Oberheim Four Voice [posted here]. Now I've got couple more Four Voices in for repair, and I thought we'd check one of them out together. In this one we repair a problem with the polyphonic keyboard assigner module."

Wednesday, May 17, 2023

Vintage Minimoog Model D Front Panel De-lamination

video upload by synthpro

Interesting bit on the front panel de-lamination starts at 2:33. Curious what he uses to get the glue off.

"Hey guys,

This is a look at a minimoog restoration I did for Bruce Hendrix. this minimoog still played decently but was definitely in need of some cosmetic TLC.

Thank you Bruce for the opportunity to restore your minimoog.

Appreciate all of you who watch my videos, thank you all!!


Sunday, March 19, 2023

Roland TR-808 (1981) - Werkstatt Matlak

video upload by Werkstatt Matlak

"Final test after repair and service.
Upgraded with Tubbutec UniPulse."

Friday, March 17, 2023

Roland TR-909 (1983) - Werkstatt Matlak

video upload by Werkstatt Matlak

"Final test after repair, service and modification (bd pitch, bd drive, hat pitch)"

Sunday, March 12, 2023

Sequential Circuits Prelude 49-Key 49-Voice Polyphonic Orchestral Synthesizer

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

"Vintage orchestral synthesizer consisting of Piano, Organ, Brass, and String sections. Freshly serviced at Pro Audio Electronics in Tampa. Like many other similar 4-section synths of this type, all 49 keys will play simultaneously for 49-note polyphony. Two of the sections can be played at the same time. It has an on-board chorus/flanger effect as well as a 7-band equalizer. The on-board effects and EQ are great for thickening and modulating the string sound beyond the scope of traditional orchestral sounds. The Prelude has a very appealing and intuitive Sequential-esque layout and appearance and is definitely one of the finest orchestral-type multitimbral synths among others in its class."

Saturday, February 25, 2023

Korg Synthe-Bass SB-100 1970s Bass Synth SN 780070

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

"Super clean inside and out. Obviously not gigged much, if at all. All keys, knobs and switches work as they should.

It was recently serviced at LA Synth Co, and ready to be put to good use!"

Saturday, December 10, 2022

Moog Source with Midi SN 3696

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

"Last serviced by Rosen Sound"

Thursday, December 08, 2022

Andrew's Moog Modular 1C Restore by synthpro

video uploads by synthpro

"Going to be bringing you along on the adventure of getting this Vintage moog modular back to 100% operation. This unit was built around August of 1972 based on dates found inside.

Special thanks to Andrew for giving me the opportunity to work on his modular. And a BIG thanks to all of you who watch my channel, really appreciate it!


Monday, November 21, 2022

The Rare Moog Sanctuary

Moog Sanctuary Repair (by synthpro) video upload by synthpro

"This is a look at a very rare synth called the Sanctuary. This is bascially a rebadged Memorymoog Plus that was to be advertised/sold to churches here in the South, it was a push to help get synthesizers used in worship. This may not seem that big of a deal today with all the electronic worship music out there but this was a HUGE step back in this era."

You can find a small handful of posts mentioning the Moog Sanctuary in previous posts here.

Tuesday, November 08, 2022

Same Patch The Next Day

video upload by John L Rice

"Pretty much the same setup as the last video, minus the FS1R and plus some sequencer related modules. This time I sequenced the poly modular and used a second keyboard to transpose the sequence while playing the Mellotron brass from the main keyboard. I almost didn't post this and may delete it but I'll leave it up for now.

Modular Polysynth:
1 x Synth Tech MOTM-650 MIDI to CV
4 x Synth Tech MOTM-300 VCOs
4 x Happy Nerding FM AIDs
2 x Moon 517 dual VCFs
2 x Oakley/Krisp1 dual VCAs
1 x Club Of The Knobs C911P poly EG
1 x Mutable Instruments/Martin Jan Koehler Tides/Tidal Modulator

Sequencer setup:
Moon Modular 569 Quad Sequential Voltage Source
Club Of The Knobs C969 Euclidian Bi-Clock Sequencer
Moon Modular 591 Switch

Other Polysynths:
Mellotron M4000D

Strymon Timeline Delay
Strymon BigSky Reverb
Lexicon M400 Reverb

Thanks for watching! :-)

#modularsynth #modularsynthesizer #synthesizer"

Vintage ARP Odyssey Mk II 2813 Synthesizer w/ LED Sliders & Moog Ladder Filter

Note: Auction links are affiliate links for which the site may be compensated.
video upload by Synth Chaser

via this auction, also on Reverb

"The Odyssey was ARP's answer to the Minimoog, a feature packed scaled down version of the legendary ARP 2600. This particular ARP Odyssey is equipped with the 4035 filter, the infamous "lawsuit filter" that "borrowed" from Bob Moog's ladder filter patent.

This ARP Odyssey has just been serviced and is functioning very well. The Synthchaser LED slider & slider cap set has been installed, and the LEDs are color coded to correspond to the original colored slider caps, which give a visual indicator of the function of each control. The difference in the way these sliders feel and perform compared to the originals is a huge improvement. The power supply was recapped, all tantalum capacitors replaced, new key bushings, cleaned key contacts, calibrated, and the 1/4" output jack made to a high output.

There are a few flaws I feel the need to disclose: The old silkscreen was worn away and the paint was also worn through, so I've installed an overlay. The quality of the overlay isn't the greatest, and the color doesn't quite match the rest of the synth, but anything is better than the way it was! Please review photos carefully. This particular Odyssey has a fairly high noise floor. You can hear it (white noise/hiss sound) when the tone sources are turned down and the VCA is open, or if the filter isn't fully open. Also, the ADSR modulation to the VCF can "overdrive" the filter if the slider is up all the way. Please see the attached video for a demonstration of these. There are a few extra holes on the back panel (the larger ones have been plugged) from previous mods that have been reverted. Since the cosmetics of this Odyssey aren't perfect, I decided not to invest the time into fixing these last problems and instead just offer the synthesizer at a better value."

Sunday, November 06, 2022

2022/08 - Yamaha CS-5 Repair & modding picturebook

video upload by Stereoping

"I recently got a #Yamaha #CS-5 in bad condition. After fixing some broken things i increasingly fell in love with it's unique sound. To expand the CS5's very limited modulation possibilities i added more and more features. This video shows all fixes and mods. With some cheesy in-between-music from 4-track tape recording - all voices played by the CS-5 of course."

Patch n Tweak
Switched On Make Synthesizer Evolution Vintage Synthesizers Creating Sound Fundlementals of Synthesizer Programming Kraftwerk

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