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6SN7 Preamplifier (Topaz Preamplifier)
Time Machine Preamplifier
Touchstone Preamplifier (Tempest Preamplifier)

The touchstone active "output-transformer-volume-control" uses a directly coupled 6SN7 driving a stepped output transformer to give the clarity of a TVC, with exceptional drive capabilities. Very low output impedance means it can even drive a pair of sensitive speakers.  No capacitors in the signal path.
4 Inputs
2 outputs
Optional headphone output 6.4mm. (rec 100 ohm minimum load)
$2495.00 (Remote volume option $475.00)

(Shown on Birdseye Maple plinth +$250.00)


Max Voltage Output ......5 volts rms. 14 volts peak.
Frequency response.......6hz to >50khz
Separation.......……….... >55db
Signal to Noise............. >88db A Weighted
Signal to Hum…….…......>68db
Distortion.................…..<0.05% at 0.5 volt rms output
Hum Level…………….......<0.1 millivolt
Gain.............................6db
Inputs………..…………......4






Manual volume switch shown at left. Seidon gold contact 23 position.
Remote volume shown in middle. Shallco gold contact 23 position with stepper motor control.





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