"the r-53 is directly derived from our legendary tm-1 device. it uses a 12af6/bd6 remote-cutoff pentode and a 12av7 dual triode. waveshaping is provided by a vacuum-tube "pulser" circuit that spits irregular pulses onto the input waveform. they synchronize erratically with the input pitch (if a waveform with sharp transitions is used). combined with true vacuum-tube circuit distortion, this can provide a vast range of complex, aggressive distortion effects, utterly unique in the world. a basic ring-modulation function is also available in the unit--applying a carrier pitch from an external oscillator to the screen grid of the pentode, this allows making inharmonic sum-and-difference pitch sound effects, with a unique vacuum tube pentode sound.
power requirement: +-12v dc, 200 ma.
the metasonix r-series of vacuum-tube modules is intended for use in any "eurorack" standard modular synthesizer system. all r-series modules are 22hp (112mm) wide and fit in any doepfer(tm), analogue systems(tm), or other compatible cabinet. they are powered entirely from the cabinet's internal +-12v dc power supplies, using doepfer compatible 16-pin power connectors. their circuits protrude behind the panel less than 25mm (1 inch). all vacuum tubes are nos (new old stock) types from classic american and european manufacturers that are run very conservatively for long life, and are readily available from distributors. the tubes protrude from the panel for visibility and cooling, less than 38mm (1.5 inches), and should fit inside a doepfer a-100 suitcase cabinet lid or into a doepfer mini case. all audio inputs and outputs and cv inputs/outputs are 100% compatible with other synthesizer modules. plate voltage is provided by a tiny switching supply producing clean 48v regulated at low current, which is very safe and will not injure the user. potentiometers are top-quality alpha rk12l types, and 3.5mm phone jacks are special kobiconn vertical-mount types, much better quality than the cheap ones usually seen in euro modules. each r-module is fully protected against reverse supply voltage, overvoltage, undervoltage, or incorrect hookup to external equipment. as with all our products, the r series is totally handcrafted in northern california, usa."
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