VAC Renaissance VAC Renaissance Seventy/Seventy 300B PPP Amp

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VAC Renaissance Seventy/Seventy 300B PPP Amp

VAC Renaissance

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Última actualización 22.05.2025

Descripción Descripción original Inglés, Otras traducciones de idiomas son traducciones y pueden contener errores. Inglés Alemán Español Turco Very good with with PSVANE 300B valves.

The Renaissance Seventy/Seventy is a completely unique power amplifier. It allies purist amplifying devices with the power and solidity required to control modern audiophile loudspeakers.

The most noticeable feature of this amplifier is the 300B filamentary triode output tube. Originally designed by Western Electric in 1935 (Footnote 1), it has several extremely desirable features that have kept it in continuous production since that time. An examination of its dynamic curves (Figure 1) reveals it to be a naturally linear device, more so than triode connected pentodes or beam power tubes (ex: KT88, EL34), let alone any transistor device. It gives this superb performance with voltages on the order of 450 VDC, not the 1000-1500 VDC required by other output triodes like the 211 or 845. This lower voltage and lower output impedance allows superior output transformer design, control of the loudspeaker, and safety.

Each 300B tube has its own separate heater power supply and independent cathode self-bias network. This has several major advantages. No user adjustment of any kind is necessary to maintain proper balance of the amplifier. The stabilizing action of this technique upon the idle current (bias point) of each tube is exceptionally strong, and self corrects for large mismatches among tubes or drift with age. This circuit also results in real- world output capability much greater than the test-bench rating would indicate (Footnotes 2,3,4).

A total of four 300B are used in each channel to reach 70 watts per channel in Class A.

The input circuitry of the Renaissance Seventy/Seventy is derivative of the unique Williamson circuit, which provides pure, direct coupled, inherently balanced input amplification and phase splitting. Type 6SN7/5692 octal twin triodes do the honors.

The superb VAC output transformer provides superb voltage/current translation, allowing impedances from eight ohms to as low as one ohm to be driven.

The 35 pound chassis is machined from quarter inch thick aluminum plate. This strong, resonance-resistent structure houses two electrically independent channels of amplification. Each channel is separate, down to two dedicated shielded power cords. A total of eight transformers are used, providing sixteen power supplies.

The units is completely hand wired in three dimensional space for the shortest possible lead lengths, allowing passive components to perform much nearer to the theoretical ideal.

The Renaissance Seventy/Seventy is designed not to the latest fad but to substance, for the highest possible sound quality. Time spent familiarizing yourself with this manual will be well rewarded.

SPECIFICATIONS:

The VAC Renaissance Seventy/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 with no feedback (0 dB) at 120 VAC, 60 Hz.

Power Output:

65 watts continuous average power at 1 kHz with less than 2% THD into 4 ohms connected to the 4-8 ohm tap

Distortion:

0.12 % 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:

Selectable: 0, 3.5, 4.5, 5.5, 6.5, 7.5 dB

Absolute Polarity:

Does not invert absolute phase

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