trip1 WY CO Jorge's awesome synth collection

YouTube Uploaded by sounddoctorin on May 11, 2011

"Bob Weigel of http://www.sounddoctorin.com begins his month or so long journey to see former Bozeman residence the Wiest family in Sheriden, WY and former roommate Alfredo Pinto in Denver area. Also quick interview with Jorge about his awesome synth studio featuring a Jupiter 8, Teisco 110F, Prophet 5, Juno 60, Minimoog, Korg MS-20, (I said 10...) Roland SH-5, Octave Cat, etc."

New video above Uploaded by sounddoctorin on Jun 20, 2011
"Bob Weigel of http://www.sounddoctorin.com talks with Jorge in Denver area about his collection of classic analog synthesizers including the Roland Jupiter 8, Sequential Circuits Prophet 5, Teisco 110F, Roland SH-5, Minimoog, Korg MS-20, Roland SH-101, Roland Juno-60, Octave Cat etc."

Crumar Composer analog paraphonic synthesizer demo

YouTube via sounddoctorin. Be sure to watch 5:50 on for the tube thing.

"Bob Weigel of http://sounddoctorin.com reviews the capabilities of this very rare analog divide down synthesizer from 1983 or so. One of the few machines built with a breath controller transducer inside so you just plug in hose. Phatt sounding monosynth. Nice organ presets and bbd leslie simulator. Polysynth and string section also can be mixed in. Only seen serial numbers in the 200's and these are so rare on ebay not sure how many were built. If anyone ever has info let me know. Visit the site for a virtual studio tour with sound clips from many of the synths there..."

Update:

Crumar Composer supplementary: Hand Vibrato demo!

Uploaded by sounddoctorin on Nov 21, 2008

Paul's Farfisa keyboards and Vox organ project machines

YouTube via sounddoctorin
"We took a video of the Farfisa stuff that Paul Haugen and I loaded into storage from Tucson. The store down there had accumulated quite a bit of stuff over the years. Many of these machines have great parts and some will be restored probably. Let us know if you are interested and check http://sounddoctorin.com as always for information on repairing synthesizers and a host of great links."

Paul's Vox organ project machines

"And here we are on the same windy day laying out all the Vox organs that came from our Tucson trip. Some of these will be restored we hope by yours truly. Some are obviously not going to be more than parts machines but quite a layout of rare stuff in one place. http://sounddoctorin.com as always for a lot of help on repairing synthesizers in the global synth page but also a tour of my own studio and some songs of mine, as well as some items I have fixed up for new owners. Enjoy."

EML 101 Electrocomp demo

Published on Nov 10, 2013 sounddoctorin·187 videos

"Bob Weigel of http://www.sounddoctorin.com demonstrates a bit of the EML101 before sending it over to England."

Korg Mono/Poly MP4 "Midipoly" upgrade- project teaser & prototype ARP2600 expander

Published on Jul 7, 2015 sounddoctorin

"Bob Weigel of http://www.sounddoctorin.com shows some installation tips re: the Midipoly upgrade which offers Midi, obviously, to the MP4 as well as several other features including use of velocity values to 15 which translate to codes that tell which VCO(s) to trigger! Also a hint of why I'm doing this. A brief look at the prototype for the ARP2600 expander that will add a fantastic capability to anything like the ARP2600 though I'm designing it specifically with that in mind. More to come! I'll put up a demo when I get it all working right!"

Jamming with "Twins" in pdx then up to Yakima 2 Tranch's

YouTube Uploaded by sounddoctorin on Sep 23, 2011

"Bob Weigel of http://www.sounddoctorin.com plays the Fender Chroma Polaris with "Twins" in NE Portland. We recorded some other tracks too but this is the only one I video'd this time. Cole is playing a JUNO 60 below the Polysix and Six-trak now.

Then I'm off to Yakima to visit my friends the Tranch's and have some great fellowship and watch their kids dominate in a soccer game that I didn't video any of unfortunately. Forgot the camera. :-("

The George Jenny Ondioline synthesizer!

YouTube Published on May 17, 2012 by sounddoctorin

"Bob Weigel of http://www.sounddoctorin.com gets a glimpse of what is apparently one of the few remaining original high portability synthesizers; the George Jenny Ondioline. Parker is planning to sell this to a museum so don't ask about acquiring it at this point. This is just for historical reference and to give a little visual on an instrument that probably doesn't have any youtube coverage otherwise. This instrument obviously used vacuum tubes and no I have no diagram for it. The tilters on the left are for changing various typical parameters of this type of thing. Probably footage mixture and filter controls. As some know it's the instrument used in Del Shannon's 'Runaway'. I do a song by this title also. Mine doesn't use an ondioline :-). It does have great lyrics and a moving beat though. It's found on my myspace site as I recall. enjoy :-)"

ARP Oddyssey, Omni w/mono/poly +old monos in general

YouTube Uploaded by sounddoctorin on Jul 21, 2011

"Bob Weigel of http://www.sounddoctorin.com demonstrates his modified ARP Omni with input to phaser /string envelope to a couple new friends who he worked on an ARP Odyssey for..which we then demonstrate and briefly compare to the sound of the Japanese competition of the day, the Roland SH1000 and Korg MiniKorg. or Univox K1."

Paul Haugen demos the Crumar T1

YouTube via sounddoctorin | December 05, 2010 | 1 likes, 0 dislikes

"Bob Weigel (Http://www.sounddoctorin.com) videos and clowns around while Paul plays the Crumar T1, a great hammond emulator of the late 70's. These machines have the basic elements of a DS-1/2 type synthesizer with the same chips for oscillation and filtration, though far fewer features. Only cutoff, resonance, decay and footages though a sustain or percussive envelope selection can also be made. Or the bass can be turned off for full width organ. They also give a wider number of bass notes than many combo organs. Great machine. Kinda towards an arp omni bass sound and three organ presets plus drawbars and a large number of percussion footage switches and two types of key click, volume and decay for paraphonic percussion."

Hammond 102100 Analog monophonic synthesizer demo

YouTube via sounddoctorin
"Bob Weigel of Sound Doctorin' demonstrates the Hammond 102100 synthesizer, a rare analog monophonic unit capable of some warm sounds and somewhat flexible through use of an array of preset switches. Sliders for wind (noise), tuning and volume. But 7 buttons each for waveforms (32' square, 32' saw, 16' of the same, 8' of the same, and 4' of a pulsey saw), filter mode, Width (one shots and repeating) and rates for vcf, envelopes for vca, pitch bend envelopes/portamentos, and modulations. Presets are French horn, Tuba, Violin, Sax, Clarinet, and 'space echo'. Cancelling presets leaves one with whatever the button matrix has selected then. Only one button in each row of 7 can be pressed at once. But as you see some useful combinations do come up and it's certainly a useful synth for the studio."

Hammond 102100 analog synthesizer tune up!

"Bob Weigel of Sound Doctorin' ( Http://www.sounddoctorin.com ) runs through the tuneup procedures for the rare Hammond 102100 synthesizer. See also video doing sound demonstrations. These are a monophonic synth with a single vco and divide down square wave arrangement. Then footages are combined to create stepped saw waveforms which may be selected instead of squares from 32' to 4' and run through the VCF and VCA sections with modulations. But controls are limited to sliders for wind (noise) and tuning and volume, and preset buttons for 7 each waveforms, filter modes, sweep rates (repeating and one shot), Envelopes, and modulations. Still there are some very nice combinations and the sound is very warm though noisy base line so far. I may need to replace those electrolytics that measure a little high on esr meter."

DIY Synth Knobs & Slider Caps | Side Panels for Korg Polysix / Poly 61 & Siel DK600

New products unveiled. Synth knobs, Sides for PS6 + DK600! Rhodes pre-piano chimes

Published on Apr 11, 2019 sounddoctorin

"Bob Weigel of http://www.sounddoctorin.com Shows the newly created mold for precision knob replicas and Soon available Walnut sides for Korg Polysix/ 61 and Siel DK600/Opera 6/ Kiwi. And a teaser for the upcoming Rhodes Pre-piano video. I can make another mold when needed but set this one up for 6 crumar, 2 arp omni 1, 1 arp 2600, 1 arp pro-soloist, 2 polymoog, 2 roland juno 6/60, 2 juno 106, 2 Yamaha CS-20m / 40m, 1 Aelita, 2 korg mini/maxi D shape and 2 oval, 1 Chroma Polaris."

Conn Electric Band tips and demo

YouTube via sounddoctorin | December 13, 2010 | 0 likes, 0 dislikes

"Bob Weigel of http://www.sounddoctorin.com shows some troubleshooting tips and the innards of a conn electric band then tries to play it. Hehe. Very odd organ but I feel when I finally get my own repaired that it's going to work it's way into being a useful tool. 1974 I was told..others say 1973. I'd love to find the date the mitsubishi output module came out but I can't see any information on the web. Anyway here it is in all it's beauty. A classic piece of the early/mid 70's. And one of the earliest auto accompaniment keyboards I'm aware of that is this portable. THe bottom speaker cabinet detaches and the top can be carried easily to a car trunk etc."

Siel DK600 + Expander Synthesizer Demo

Published on Apr 24, 2014 sounddoctorin·189 videos

"Bob Weigel of http://www.sounddoctorin.com demonstrates an assortment of layered sounds from the two 6 voice "DCO" analog units. (Actual 2 analog oscillators each that drive a divide down network to create digital waveforms that are assigned to 6 analog synth channels as needed. An op amp saw converter produces the sawtooth waveform and PWM with comparator as is common. These synths have 3 LFO's but two are for one DCO each and are tied to the same set of controls. Added warmth. Really great pad and clav sounds and some brass."

Follow-up to Siel DK600 tech talk; a tough nut to crack

Farfisa Syntorchestra internal view and features run down

YouTube Uploaded by sounddoctorin on Jul 20, 2011

"Bob Weigel of http://www.sounddoctorin.com investigates the Farfisa Synthorchestra a bit and demos the sounds."

Siel DK70 keytar Demo

YouTube via sounddoctorin

"Bob Weigel of http://www.sounddoctorin.com plays the DK70 to a background loop done with just a K1200 Kurzweil bass sound and Alesis D4 drums. This unit is fairly rare. Only a few thousand made. It has one SSM2045 VCF and one generator chip that is driven by the SSM2031 HF vco chip. And a TDA1022 BBD for chorus as I recall. Digital envelopes. The DK80 is basically twice the synthesizer except they only use 6 voices on each voice chip! THe DK70 is 8 voice. Not sure why they did that but anyway both units have basically the same sound engine, the DK80 is just bigger and is 'Bi-timbral' so it can layer the two sounds etc. The keytar necks are hard to come by. If anyone has one lying around let me know. I have two more of these I'd like to rig up for somebody. Of course you can play them without the neck just using the pitch wheel instead of the bender and the vibrato button that is on the machine..but you sacrifice the octave shifter and the hold button."

Roland SH1000 monophonic analog synthesizer demo

YouTube via sounddoctorin
"Bob Weigel of Sound Doctorin' ( http://www.sounddoctorin.com ) works through some of the circuit design and plays through the variable settings on the Roland SH1000 classic vintage monophonic synthesizer, the first unit shipped from Japan by the Roland Corporation in 1973. This one has the potted modules which were replaced at some point with non-potted circuitry it appears. We scrapped one unit because we had no front panel and many switches were broken etc. I think I'll use the guts to slap into maybe an EP10 of the same year though somehow :-)."

Crumar Performer with octave slider plus sustain options!

Published on Aug 1, 2015 sounddoctorin

"Bob Weigel of http://www.sounddoctorin.com shows a tech brief and demo of his latest modification. The last Crumar Performer version I have used the SSM2040 vcf and a SSM2056 eg in place of the moog vcf and discrete eg. with it's quirky interactive behavior used in the original units. The last version also adds an octave switch.

As it turns out barely over an octave can be achieved at the summing node for pitch without causing oscillations to cease for whatever reason I discovered, as I installed a slider instead of a switch in this unit giving a lovely contiguous transition of pitch for 1 octave. Provided you don't retune it with the tuning pot on back :-). There is a requirement to readjust the trim pot I installed if you do that. But as long as you keep it on A440 it's a nice octave. SEE MY PREVIOUS video on the performer mod to see details of how to give yourself four modes of operation with regard to sustain and crescendos."

Ibanez AD80 repair. Documenting a ghost in the machine.

YouTube via sounddoctorin. vox continental
"Bob Weigel of Sound Doctorin' ( http://www.sounddoctorin.com ) shows some of the interesting effects attainable from a classic digital delay unit, the AD80 by Ibanez, during a repair attempt. To clarify what I'm saying about the circuitry in the video, this pedal uses two FET's as alternating switches for the bypass or effect signals. A flip flop circuit turns on one of them at a time and toggles of course when the switch is depressed. I've never seen my breath have quite so much conductivity. I must be eating metal flakes in my diet. Because there are 1M resistors coming from the flip flop voltages (which were quite steady at about 10V on the FET that is supposed to be turned on during the cutting out effect you witness in the video) and attaching to .047uF filter capacitors (grounded on the other side) and to the cathode of a diode, the anode of which attaches to the gate of the FET switch. The voltage at the point where the filter cap is is what was collapsing to a few volts. Even at 8.some volts though there is enough current drain from the gate to shut off the FET switch. But I saw the voltage fall to just a volt or two when I was breathing on it. Well the clear cote (a super low conductive paint basically) seems to have done the job at protecting it from ...conductive air :-). If anyone has studied more into this effect let me know."

Vox Jennings Univox and Hammond Solovox tech and sound check!

YouTube Uploaded by sounddoctorin on Mar 4, 2011

"Bob Weigel of http://www.sounddoctorin.com leads us on tour inside and out of the original monophonic organ/synths. (With very simple synth features like footage selections and slow attack envelope on the Hammond) Actually the Hammond Solovox (produced from 1940 to 1950 nearly I hear) is a scaled down mono version of the 170 tube 500 some pound Hammond Novacord (Made in 1938!) Novacord was a full polyphonic divide down synthesizer like many transistor ones create in the 70's (Arp Omni etc.) Probably the most ahead of it's time musical instrument ever created.

The Solovox's tone cabinet contains the divider tubes and mixer tubes as well as a huge relay can that operates each time a key is hit. There are three relays that route signals for each of the three 'buss segments'. I said 'three buss' keyboard in the video but it's not three parallel buses but rather three single buss segments. 1 per octave. The footages are prearranged by those switches to be apportioned appropriately to the three buses.

THen after the relays properly route things from the high low and mid mixes, we go to the filters that are selected by the buttons beneath the keys. The capacitor ladder and mechanical vibrato are also housed therein with the knee volume lever that uses a set of resistances to gradually increment the volume.

We'd love to find more information on the Jennings unit if anyone has it! A schematic would be awesome!

The Univox has simplified things to get a great tube sound into a much smaller box by 1954. The keys are also much more playable! The short keys on the Solovox take some getting used to. Definitely some useful sounds!"

Crumar DS-2 glide mod, tech overview and WAVEFORMS.

Published on Feb 17, 2015 sounddoctorin

"Bob Weigel of http://www.sounddoctorin.com does a more recent review of the Crumar DS-2 synthesizer and shows the waveforms being generated by the DCO's and poly section before the VCF. If there is call I'll try to do the rigorous circuit run through video. I've just been too busy...look for upcoming products for modular users :-). Give me a month or so."