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"If you are the type who likes things that are different , the Metasonix TM-1 may be just what you have been searching for. With its all vacuum tube circuit, there is no mistaking the sound of the TM-1 with any other device.
Metasonix took the basic circuit of their award-winning TS-21 Hellfire Modulator, and added the world's first vacuum tube audio ring modulator. The result is a new sound-effects device in a small, economical package. The sound is totally unique, powerful and distinctive. Use it as a stand-alone effects box, or mount it in a modular synth with the optional TM-D or TM-M kit.
The pentode preamp gives gain and distortion; the pulser injects small pulses on top of the signal; and the beam tube gives both wavefolding and ring modulation (carrier provided by an internal wide-range oscillator, or inject your own carrier signal). The TM-1 can also be used as a self-contained pseudorandom signal generator, by patching its output back to its input. You've read about "strange attractors" and other chaotic sound generation techniques? The TM-1 is the first all-tube chaotic sound generator. The results must be heard to be believed!
Frequency response: less than 10 Hz to greater than 40 kHz
Distortion: from less than 0.1% to 100%, depending on control settings and input waveform
Hum and noise: less than 0.5 mV
Power input: 10 - 12 volts AC, 50/60 Hz, 0.8 amp at idle
Inputs: phone jacks for audio input; optional inputs for beam-tube CV, VCA CV, and ring-modulator external carrier (requires at least 20v p-p signal for full effect) Output: audio (mono)
Dimensions: 7 1/2" (192mm) x 4 3/8" (112mm) x 3" (77mm)
Weight : 5 pounds (2.2 kg)
This device has been refurbished recently by a professional and works perfectly."
"The VX-351 is a control voltage and gate output expansion box that provides 19 Control Voltage and 2 Gate outputs generated by the Minimoog Voyager. Also included are two 4-way mults for distributing a voltage to multiple destinations, and two attenuators.
"If you are the type who likes things that are different , the Metasonix TM-1 may be just what you have been searching for. With its all vacuum tube circuit, there is no mistaking the sound of the TM-1 with any other device. 
"This is the 4mb version which gives you 47 seconds sampling time (23.5 stereo). EIII is in fully functional condition but cosmetically has seen some better days and priced accordingly. That being said it's still pretty clean in my opinion.
