Vox VX50KB 1x8" Keyboard Amplifier (2017 -)



2_Footer
© 1998 - 2017 The Vox Showroom, all rights reserved. No use on online auctions, eBay or Reverb.






Korg Nutube 6P1

Three new Vox VX50 series amps were introduced in the fall of 2017: the VX50AG Acoustic amp, the VX50KB Keyboard amp and the VX50BA Bass amp. Each was rated at 50 watts RMS.

ABS Plastic Enclosure
Like the Vox VXI and VXII that preceded them in 2015, the VX50KB featured a lightweight but durable injection molded ABS plastic cabinet finished in black spatter paint. The closed back VX50KB enclosure was loaded with an 8" 2-way coaxial speaker mounted to a wood speaker baffle. Two bass reflex ports enhanced the low frequency response.

This unique construction combining plastic and wood allowed the VX50KB to weigh less than 10 pounds.

Nutube
The preamp section of most tube guitar amplifiers normally include at least one 12AX7 tube. The 12AX7 was designed as a "dual triode," meaning that it includes two separate circuits for amplification. Each of these triodes has three elements: a cathode, control grid and an anode. Amplification occurs when a flow of electrons from the cathode passes through the control grid to the anode. A filament wire located near the base of the tube heats the cathode to start this flow of electrons.

Korg has been a leading manufacturer of portable keyboards since the early seventies. Most modern Korg keyboards incorporate a vacuum floresecent display (or VFD) that offers a visual indication of the sound that is loaded and ready to play.

Korg discovered that a vacuum florescent display could be configured as a triode, complete with cathode, control grid and anode, to create amplification. After years of research, Korg developed the dual triode Nutube 6P1 vacuum tube (seen at lower left). It utilized new technologies derived from vacuum florescent displays that would allow the Nutube 6P1 to perform the same functions as a traditional 12AX7.

The Nutube 6P1 offered a number of advantages over the 12AX7. The Nutube 6P1 is significantly smaller than a 12AX7. As it did not require a traditional filament heater, the Nutube 6P1 required a fraction of the current required to power a 12AX7. Unlike the 12AX7, the Nutube 6P1 remained relatively cool to the touch while in operation. Finally, the Nutube 6P1 offered a significantly longer service life than the 12AX7, perhaps never needing replacement.

The preamp of the Vox VX50BA utilized a Korg Nutube 6P1 vacuum tube. It offered the rich overtones of a traditional vacuum tube without the need for periodic replacement. The turquoise glow emanating from the Nutube 6P1 can be seen through a series of twelve small holes located on the control panel.

Hybrid Circuit
While the preamp circuitry of the VX50KB utilized a 6P1 Nutube, the 50 watt power amp was solid-state.

Controls
The VX50BA had three channels, each with a single 1/4" high impedance input jack, LED clip indicator and a volume control. The third channel included switches for phase reverse and to select between line or microphone levels. A Master control adjusted overall level. Tone was tweaked by a three band equalizer operating at the following frequencies:
    Bass Control - +10dB @ 100 hz
    Mid Control - +10dB @ 700 hz
    Treble Control - +10dB @ 10 khz
Inputs and Outputs
In addition to the three 1/4" channel inputs, the VX50KB included a 1/8" stereo head phone jack, a 1/8" stereo AUX IN jack and a 1/4" LINE OUT. A jack on the rear control panel accepted the plug from the 19 VDC external power supply.

VOX VX50KB Amp Specs
Output Power: 50 Watts RMS
Speaker: 8" 2-Way Coaxial Speaker
Inputs: Input jack, Headphones jack, Aux In jack
Controls: Gain, Bass, Mid, Treble, Master Volume, Phase Switch, Line/Mic Switch

Power Consumption: 3.42 A
Dimensions (W x D x H): 13.94” x 7.56” x 12.32”
Weight: ~9.04 lbs
Included Accessories: Power cord, External "Brick" Power Supply,
Manufacturer's Suggested Retail : $319.99
Street Price: $229.99




2_Footer

.................



The VOX Showroom!


Photos and editorial content courtesy Gary Hahlbeck, North Coast Music


Any and all material presented herein is protected by Copyright.
© 1998 - 2017 The Vox Showroom and North Coast Music, all rights reserved

The images and editorial content in this web site may not be copied or reproduced
in online auction sites such as eBay and Craig's List. Sellers may provide a link
to the Vox Showroom web site if they wish to refer to this copyrighted material.


URL: http://www.voxshowroom.com/uk/amp/vx50kb.html