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BAT VK-33 Tube Linestage Preamplifier

Balanced Audio Technology VK-33 Tube Linestage Preamplifier Boasts New Power-Supply Transformers for Marked Increases in Dynamics, Speed

Superior User Interface and Shunt Volume Control Among Sonically Astute Features Gracing BAT VK-33 Tube Linestage Preamplifier

The BAT VK-33 tube linestage preamplifier is trickle-down sonic opulence in action. Formerly reserved for BAT SE models, new power-supply transformers provide marked increases in dynamics and speed. In VK-33, the signal is transmitted through only one gain stage, freeing it from the negative artifacts attributable to both extremes of modern preamplifier designs. A superior user interface, shunt volume control, and optional MM/MC phonostage card further up the ante. And of course, the design can be upgraded to “SE” status at any time.

New Power-Supply Transformers for Increased Speed, Dynamics
BAT's VK-33 preamplifier incorporates changes to its power supply formerly reserved for Special Edition models. New SE power-supply transformers provide marked increases in dynamics and speed. In addition, the signal in VK-33 is transmitted through only one gain stage. As such, it’s free from the negative artifacts attributable to both extremes of modern preamplifier designs: passive preamplifiers at one end of the spectrum and multistage, buffered active circuits at the other. The trademarked Unistage circuit provides the ultimate simplicity of amplifying the incoming signal only once, using no global feedback to double-back on the straight-through signal integrity.

Exactly Why Balanced Is Better
Naturally, VK-33 is balanced. Why is this approach superior? Balanced topology simply provides a complete signal representation.  Magic happens when you free yourself from limitations of the single-ended structure with its half-signal processing. If a one-handed craftsman can be very good, imagine what he can do with two hands. Vacuum-tube current sources further improve the linearity of the gain stage to yield a more open, textured sound. In addition, with the purchase of BAT’s X-PAK accessory, more than one type of vacuum tube can be used, meaning you can fine-tune the sound to best meet your individual needs.

You’ll Always Get the Volume Exactly How You Want It
Outfitted with a superior user interface, VK-33 is a breeze to use right out of the box. BAT also took care of vinyl lovers. Just order VK-33 with BAT’s VK-P3 phono card, which provides switch-selectable moving-magnet and moving-coil gain settings. And with VK-33, you can always get the volume just right. It employs a proprietary electronic shunt volume attenuator that offers 140 steps of 0.5dB resolution that sound continuous to the human hear. Discrete metal film resistors are used to bleed the unused signal to ground. Indeed, all you need to do is listen. 

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Inputs: 2x XLR + 3x RCA
Output Impedance: 1k
    Main: 1x XLR + 1x RCA
    Tape: 1x RCA
Noise (unweighted): -90dB
Distortion at 2V output: 0.01%
Frequency Response: 2Hz to 200kHz
Input Impedance (minimum): 100kΩ
Maximum Gain: 17dB
Maximum Output Signal: 30V
Global Feedback: None
Absolute Polarity: Switchable
Volume Control Resolution: 0.5dB
Volume Control Number of Steps: 140
Power Consumption: 130VA
Dimensions: 19" x 5.75" x 15.5"
Weight: 38 lbs.

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User Manual (PDF, 151 KB)

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