VAC Renaissance 30/70 - Manual (Page 12)

10
SPECIFICATIONS
The VAC Renaissance Thirty/Seventy 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.
For those concerned with test bench performance, the following describes typical measured performance when operated
at 120 VAC, 60 Hz.
Power Output: 70 watts continuous average power at 1 kHz with less than 2% THD into 8 ohms connected to
the 8 ohm tap.
Distortion: .12 % THD at 10 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.
Power Bandwidth: down 0.5 dB at 12 Hz and 58 kHz.
down 3.0 dB at 8 Hz and 85 kHz.
Negative Feedback: No loop current or voltage feedback of any kind.
Absolute Polarity: Does not invert absolute phase.
FOOTNOTES:
1. Tube Manufacturing at Western Electric: The WE 300, Attila R. Balaton. Journal of the Audio Engineering
Society, Vol.37, No.11, November 1989, pages 949-958.
2. The Low-Loading Self-Biased Amplifier, L.B.Dalzell. Audio, December 1959, pages 19-21.
3. The Fixed-Bias Story (Is Fixed Bias Really Better?), Herbert Ravenswood. Radio-Electronics, February 1958,
pages 47-49.
4. Philips Hi Fi Amplifier Circuits. Published in Holland, 1958.
5. WE 300B. MJ Audio Technology, 1992/5, pages 213-215.