MATRIXSYNTH

Korg PS-3100 rare polyphonic vintage synthesizer SN 901011

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Quasimidi Rave-O-Lution 309 Analog Emulation Synthesiser Drum Machine Groovebox

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Yamaha DX-100 FM Keyboard Synth

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Alesis A6 Andromeda True Analog Synthesizer

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Original Roland Juno 60 Analogue Synth Factory Patch Tape And Sheet

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"This is an original, ultra-rare, unused sound patch cassette and chart that was supplied with the famous Roland Juno 60 analogue synthesizer when it was new. Everything is in great condition for age. There are a couple of marks on the patch sheet but no tears. The cassette is still in its original Roland plastic case."

1984 Sequential Circuits German Ad

via synthmuseum.de

Modular synthesizer explorations

Published on May 16, 2014 adam dunn·39 videos

"Vortex recording modular synth #tripeze object,"

Tube synthesizer revisited

Published on May 16, 2014 256byteram·133 videos

"I've been working on my tube synth again. It's a voltage controlled, monophonic synthesizer with a linear control input.

The circuit works a lot like a Theremin, though why it outputs a pulse waveform and not a sine wave is beyond me. It's probably the two oscillators interfering with each other.

It works with a reactance tube (a 6BA6, a remote cutoff pentode to give a musical scale from a linear input) modulating the frequency of an LC oscillator (a 6C4) by a few tens of kilohertz across the voltage range. The oscillator runs at a few hundred kilohertz so this frequency is mixed (in a 6AN7A) with a fixed oscillator (also in the 6AN7A). The difference of the two frequencies is extracted and sent to the amplifier. This is what you hear.

For the voltage controlled amplifier, the 6AN7A's screen grid's voltage is controlled to adjust the gain. The high frequency from the fixed oscillator is tapped off and amplified through a dual triode driving an IF transformer. The secondary winding of the transformer is put between the keyboard's lowest note and ground. This doesn't change the DC operation of the keyboard but it injects a high frequency sine wave into it. When a key is pressed, the sine wave is allowed through. The DC level is sent to a capacitor to control the pitch and the AC signal is sent to the other half of the dual triode and amplified through another IF transformer. The output of this is rectified and sent to a capacitor, which drives the screen grid of the 6AN7A.

Getting the thing to stay in tune is a real pain. It's RF so moving any component changes the operating frequency.

I'll draw a schematic up and post it if anyone wants a look."

Introducing Analog Rytm OS 1.01

Published on May 16, 2014 Elektron·45 videos

"OS 1.01 introduces two new machines. BDFM (Bass drum FM) and SDFM (Snare drum FM) are based on linear FM synthesis and endow the Analog Rytm with even more sonic possibilities.

Other improvements brought by OS 1.01 include more copy/paste options and several usability tweaks.

For a full list of changes, see the documentation included with the upgrade zip-file.

Analog Rytm OS 1.01 is available for free download at http://www.elektron.se"