Telmatronics Groovetube - comparing line-in/output signals

video upload by Telmatronics

"This video shows our completed machine, running second-version pcb.
It is essentially a 2-channel valve pre-amp with plasma tube in the current path. One channel is used for the synth voice, one for line-in.

We've got a good sound putting audio through a Wingie2 resonator before sending to the synth line-in. This boosts certain frequencies of the input, which puts some initial distortion onto the signal.
For these clips the input signal was split before the line-in, and routed into a separate mixer channel to the synth. Turning them up in turn lets you hear what the resonator is doing, and what the synth is."

Groovetube preview 1 - fluorescent

video upload by Telmatronics

Groovetube preview 2 - neon tube

video upload by Telmatronics

"This is a full-spec machine running our second pcb. The re-design improved the analogue signal clarity, and made the plasma stability control more consistent over the operating range.

In these clips the synth is running in sync with the drum machine.
The hi-hats signal was routed through a Wingie2 resonator into the synth line-in, then combined with the synth internal voice before being sent to the tube input.

The resonator boosts certain frequencies of the input, which gets a great response from the plasma. The decay time is short in the first clip, long in the second. We have a comparison of input/output signals in one of our other videos.

Limited numbers are currently available for pre-order, more information at:
www.telmatronics.co.uk"

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