analog synthesizer

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Rare Technics SY-1010 analogue synthesizer (1979)

via this auction
Not the best shots, but you don't see these often.

"A light weight synthesizer manufactured by technics in 1979. It's all analogue, with no battery for memory or anything like that, so it's probably still quite clean inside, and has survived in good condition for nearly 30 years.

It is compact (roughly the same size as a technics SL-1200 turntable)

Typical Oscillator+Noise->Filter->VCA monosynth setup with LFO.

The LFO can go up to quite high frequencies (i'm guessing around 100hz or maybe higher), so it can be used as an FM effect.

There is also a tuning knob for the main oscillator, which has a range of less than 100hz, up to somewhere above 10000hz.

There are no inputs at all to this synth. But i guess someone with experience could add cv/gate inputs, and probably even midi too, if that was required."

Maestrovox tube synth

via this auction
"Up for sale is a rare Maestrovox tube synthesizer keyboard instrument, one of 17 known to exist, and a unique model. These first went on sale in 1952. Much information on these, including schematics, can be obtained by visiting the following website, which belongs to the granddaughter of the inventor of the Maestrovox:

This Maestrovox is a special instrument because the keyboard's facade (rocker switches, entirely black paneling, etc), is imitative of the Clavioline, while it still maintained the same speaker/ amp cabinet as the regular Maestrovox Consort model. It has mounting stand. I think the way this Maestrovox was supposed to work is that you place the speaker/ amp cabinet on the ground, which brings the keyboard to playing height if you are in the sitting position. Quite a unique, cool set-up.

This Maestrovox is cosmetically in very good condition. The keyboard itself is in excellent condition. The speaker/ amp cabinet is missing its original grillcloth (a green replacement grillcloth has been mounted to the front with thumbtacks), and the tolex if pealing in a few places.

This Maestrovox MIGHT be completely functional, but my power converter does not provide enough wattage to adequately test it. It runs off of 220V/240V, because it was invented in Australia, and the only converter I could find locally that would support that voltage was at Radioshack, and it only could provide 44W of power, which is only enough for a small appliance (I have included a picture of the converter I used to test it). So, because of that, the Maestrovox could not be properly tested. From my albeit insufficient testing, the upper two octaves definitely worked, and the lower octave did not work. That is likely a simple fix because the Maestrovox, like the Clavioline, used three-octave dividers to derive all the pitches from a single top-octave tone generator. The sound is somewhat weak, which is also likely due to the insufficient wattage. It could even just be a bad tube, or perhaps the lack of power resulted in only two of the octaves working during testing. Why did Maestrovoxes, Claviolines, Ondiolines, and Solovoxes have only 36 notes? Because adding a 37th note would have required a fourth divider. This Maestrovox has an octave switcher with three positions immediately to the left of the rocker switches, and two tuning knobs on the left and right side of the keyboard front. The same thing happens one each octave setting: the lower octave of the keyboard does not play anything. With the schematics, it should be very easy to bring this to perfect functional condition, if it is not functioning perfect already when properly powered (I'm not able to test it sufficiently, as described below).

Further information on the history and function of portable and mountable tube synthesizers (namely the Clavioline, but also the Maestrovox, Ondioline, and Solovox) can be found here
And another Maestrovox-related webpage"

Yamaha SK20

YouTube via abertronic. via these auctions
"A lovely sounding organ / strings / polysynth . Early yamaha Digital FM for the organ , strings and polysynth are analog. String sound is comparable to the Roland RS 202 and you can build up more complex sounds because of the 3 sections. PItch of the organ/string section can be detuned against the pitch of the polysynth. It contains an excellent ensemble effect in addition to vibrato and tremelo effect. Its a little heavy so best suited for studio use!
The analog section strings/polysynth sound , to me , is very beautiful ; grainy ., a very physical real sound .
One note ; the polysynth section contains a selection of wavetypes 4'saw down to 16'pulse . If you place the switch in between to wavetypes you get a mixture of those 2."

Ratcheting VCS and PLL

YouTube via boobtube356
"Doepfer A-196 PLL tracks a simple sequence. The output goes to a PlanB model 12 filter in bandpass mode, and then on to the MakeNoise QMMG in low pass gate mode. The QMMG is modulated by the Cwejman ADSR-VC2. The ADSR is triggered by the PLL Phase Comp. output, which is getting smoothed out by the Bananalogue VCS, then sent to the Doepfer A-156 quantizer. The quantizer generates triggers for the ADSR as the VCS output varies. The Phase Comp output from the PLL is very unstable, even with the VCS, so the ADSR fires rapidly. The VCS is receiving rise and fall modulation from the original pitch cv coming out of the sequencer. The sequencer is Doepfer A-160/1 to PlanB M14."

Hollow Earth DIY waveshaper LFO - demo 2

YouTube via muki123
"AVR-based waveshaper/tremolo/envelope. More info found here:"

x0xb0x - Best TB-303 Replica (xoxbox analog synth)

via this auction
"The x0xb0x is an analog replica of the legendary Roland TB-303 synthesizer. It uses the same components, in the same schematic, to match its sound — perfectly. The difference in sound between a well-made x0xb0x and a TB-303 is about the same as the difference between one TB-303 and another.

AcidVoice has judged it as having the best sound out of the nine TB-303 clones it tested.

'An original TB-303 was disassembled and reverse-engineered to verify the schematic. The original transistors were analysed using big expensive curve-tracers to determine their characteristics. We measured every waveform and counted every cycle.'
— x0xb0x creators

The x0xb0x copies not only all of the electrical interconnections inside a TB-303, but incorporates the old, rare analog components, such as 2SC2291 matched-pair transistors and AN6562 op-amps. Consequently, it has earned the reputation of having the most faithful sound of all 303 clones. In addition, the x0xb0x supports MIDI, has a non-volatile EEPROM (no backup battery), and can save and restore patterns to a computer.

The x0xb0x is usually available as a kit, with customers placed on a year-long waiting list to receive the official version. The kit is very affordable, but the difficulty of putting it together is not small, for an electronics hobbyist. A musician may find the task daunting. The difficulty lies not so much in placing the components, or of using a soldering iron, but rather in fixing problems in the x0xb0x that are discovered only once the whole thing is built. Often, it is something random, such a transistor that was killed by static electricity, or mixing up one of the five hundred components. If this happens, finding the fault is difficult without an oscilloscope and a reference, though the generous members of the adafruit forums try to troubleshoot problems. Perhaps as many as half of self-built x0xb0xes don't work right away (and some of these wind up on Ebay).

For those who have more interest in creating music rather than electronics, buying an assembled x0xb0x makes sense. The x0xb0xes we sell are assembled with experience. Moreover, they are tested thoroughly. The analog section is carefully compared to a reference machine in A/B listening tests, to guard even against flaws that change the character of the sound only subtly — flaws which may slip unnoticed without reference testing. Finally, the x0xb0xes are tuned using a high-end oscilloscope. The tuning is aided by high-precision trimpots that are ten-fold more precise than the ones bundled in the official kit.

This x0xb0x is made using old, original transistors for an unmatched sound, and brand new buttons and potentiometers for a long life. Constructed by x0x Source, it comes with a 1 year warranty. The aesthetic design is customized, featuring a beautiful front panel that feels rich to the touch. Also bundled are printed forms of the manual and a CD with the documentation, software for upgrading firmware, and complete source code and schematics. The x0xb0x, after all, is an open source product.

The reasons that we think make x0x Source the biggest and most trusted supplier of fully assembled, tested, and warrantied x0xb0xes are:

* Experience and quality -- We've already assembled and shipped dozens of x0xen. We use computer-aided testing and calibration, together with careful A/B listening tests to guarantee each x0x.
* Solid return policy and warranty -- Full refund within 30 days. Comprehensive warranty on parts, labor, and two-way shipping for one year.
* Honesty and communication -- All questions answered in one day. If there is ever a problem or delay, we bite the bullet and tell the truth.
* Fast delivery -- Next-day shipping via EMS. Delivery to most European countries takes one week (including customs).
* Reputation -- We really can't say much more than our customers. Their cumulative rating of our x0xes (known as "Item as described") is 5.0 out of 5.0."

Treat Yourself :)