SAC Thailand Minute Transformer Volume Control - Passive Preamp

Offered for sale is my transformer volume control (TVC) from SAC Thailand. This is a passive "preamp" with three inputs on RCA connectors and a single stereo output on RCA connectors. On the front panel one can select 0 dB or +6 dB of transformer gain. The input select and stepped attenuator are high quality Seiden switches from Japan. This unit uses the same transformers (OEM from SAC Thailand) as the highly regarded and extremely expensive Thrax Audio Dionysos preamplifier.

A fantastic option between a DAC or CD player and a vacuum tube amplifier. Much more life and vitality than a resistor-type passive volume control and more transparent/lower noise floor than most active linestage preamps (tube or solid state).

This unit was purchased (November 2013) direct from the manufacturer for a second system which never eventuated. It was tested only to ensure that it functions perfectly. It is cosmetically and functionally as new.

Shipping costs to be borne by the purchaser. Please contact me for an accurate quote before committing to purchase.

Paypal fee to be split equally with the purchaser.

Some information from the manufacturer:

Minute Passive Pre-Amplifier circumvents the above issues by utilizing transformer attenuation method that offers much higher impedance at +1 Megaohm range at 1KHz so at 2Vrms signal, the transformer will draw much less than 2uA of current (<0.002mA). +100 times less current drawn than resistor attenuator type. Another benefit of using transformer attenuation is its low DC resistance device at both input and output coils (in range of much less than 1 Kilo ohm). This low DCR characteristic forms easy path for noise or ghost voltage to bypass to signal ground. The figure is +10 times more effective than typical resistive element type passive attenuator. (dilemma to resistor attenuator is that it can't be chosen too low value since it will load the source and create unacceptable distortion & poor bandwidth, can't be chosen too high value since it will be inefficient to suppress induced noise)

Last but not least SILK STA-522A can amplify signal by doubling its output (+6dB function) to drive low sensitivity Power Amplifier which the resistor passive type could not do. Should there be a need to make phase correction in the out-of-phase audio systems, special arragement could be had for the phase inversion of signal modification since transformer can invert signal phase by just switching the coil arrangement (resistor could not do this).