VAC PA-90

Vintage Tube Monoblocks Amplifiers.

The VAC System has been developed with the critical ear as the major arbiter of quality, with
both conventional and unique measurements providing insight and guidance as necessary. The
lack of emphasis on measurements is due to the fact that engineering's arsenal of equipment
and techniques do not operate on the pattern recognition principals that control human
perception of sound.

In the immortal words of Daniel von Recklinghausen, if it measures good and sounds bad, it
is bad. If it measures bad and sounds good, you've measured the wrong things.

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96 watts continuous average power at 1 kHz with less than .35%
THD into 8 ohms connected to the 8 ohm tap. 120 watts continuous
average power at 1 kHz with less than .45% THD into 5.33 ohms
connected to the 8 ohm tap. Triode mode reduces power to 60
watts.

Frequency Response: down 0.5 dB at 6 Hz and 90 kHz, ref 0 dB = 1 watt @ 1 kHz.
down 3.0 dB at 2 Hz and 103 kHz, ref 0 dB = 1 watt @ 1 kHz.

Negative Feedback: Loop feedback is fixed at approximately 8.3 dB regardless of output
tap selected.

Absolute Polarity: The PA90 does not invert signal polarity.

Input Impedance: 100k ohms

Sensitivity: .7 volts RMS input produces 90 watts output

S/N ratio: > 94 dB