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Signature Mk IIa SE

Preamplifier

Not long ago, the Signature Mk IIa was the finest preamplifier you could buy. In production since 2000, this enduring classic marked the introduction of the basic, fully balanced, zero-feedback, transformer-coupled Class A1 triode topology found in all contemporary VAC preamplifiers. Even from this early form, it preserves and reproduces the emotion and vitality of music and maximizes the performances of the associated source components and power amplifiers.

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Description

Technical Specifications

SIGNATURE MK IIA Optional MM/MC phono stage with user adjustable loading

Gain

11 dB

Inputs

  • 3 sets RCA line input
  • 2 sets balanced/RCA selectable inputs
  • set RCA cinema bypass input
  • Optional 1 MM and 1 MC (or additional line input if phono is not fitted)

Outputs

  • 2 sets RCA
  • 2 sets balanced XLR (EIA “pin 2 hot” studio standard)

Tubes

2x 8416, 7308, 6922, E88CC, ECC88, 6DJ8, (or 12DJ8 twin triodes)

Absolute Phase

correct from all inputs to all outputs

Frequency Response

Flat over audio band
–3 dB bandwidth 5 Hz – 210 kHz

THD

<0.009% @ 1 kHz, 1 V RMS

Maximum Output

> 8 V RMS

Output Impedance

< 150 ohms, 20 Hz - 20 kHz, static (i.e., not dependent upon feedback)

Maximum Input

Infinite signal (attenuation precedes the gain circuitry)

Recommended Output Load

> 300 ohms

Power

External power supply, detachable umbilical cable, detachable IEC power cord

Cinema Bypass

Yes

Voltage

May be ordered for 100v, 120v, 220v, or 230/240v operation

Remote Control

included

Illumination

Illuminated logo may be switched off

Finish

  • Hand-rubbed gold-flake gloss black lacquer with chrome knobs standard.
  • Hand-rubbed metallic gloss silver lacquer with chrome knobs special order with additional cost.

Warranty

Two years parts and labor, excluding tubes (USA, see manual for full details)

Dimensions (H x W x D)

  • Audio chassis (not including knobs and connectors): 5.5" x 18" x 14.5" (14 cm x 45.7 cm x 36.8 cm)
  • Power supply (not including connectors): 4.3" x 18" x 14.5" (10.9 cm x 45.7 cm x 36.8 cm)

Shipping Weight

With phono: 61 lbs. (27.7 kg.)

Phono Stage (optional)

Tubes

6x 12AX7

Gain

44 dB MM
68 dB MC

Frequency Response

RIAA standard +/- 0.2 dB (20 Hz - 20 kHz)
-3 dB bandwidth 10 Hz - • 80 kHz

Channel Separation

> 80 dB @ 1 kHz

Maximum Input

> 130 mv @ 1 kHz, MM
> 13 mv, MC

MC Load Impedance

selectable, 470, 300, 250, 200, 150, and 100 ohms

MM Load Impedance

selectable, 47k, 30k, 25k, 15k, and 10k ohms

Overload

117MV @ 1kHz = 8 volts RMS output; 460MV @ 10kHz

Residual Noise

Less than 3MV at output (s/n ratio greater than approx. 69db
About VAC

Hi-end Audio / Patented iQ technology / Valve Amplifiers / Made in U.S.A

VAC was founded in 1990 by Kevin Hayes and his father, Channing W. Hayes in Sarasota, Florida. With their specialty on valve amplifier design, VAC makes their first major leap – awarded as the OEM manufacturer to produce some of the classics valve amps: Marantz Model 7 / 7C, Model 8B, Model 9. After the foundation on OEM on Marantz valve amplifier, VAC returned to design and produce quality valve amplifier.

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Signature Mk IIa SE