Vox VX50KB Keyboard Amplifier with Nutube (50 Watts, 1x8")

Get the bass extension and crisp treble you need with the lightweight Vox VX50KB, a portable keyboard combo amplifier with three-band EQ and a tube preamp.

The Vox VX50 KB is a compact, lightweight and cutting-edge keyboard amplifier with an impressive 50 watts of output power and clear, transparent tone courtesy of the Nutube-equipped pre-amp. Beyond its impressive sound, the VX50 KB provides players with three independent channels, one of which accepts Line or Mic levels, and a three-band master EQ for full control over the sound. There's also a full assortment of input/output jacks for connecting your headphones, media player or PA system. Weighing in at only 9lbs, the VX50 KB is a fully-featured keyboard amp that doubles as a mobile PA system.

The compact and lightweight VX50 KB was designed specifically for keyboard and features a coaxial speaker and unique bass reflex structure that ensures crystal clear high-end, rich low-frequency reproduction, and warm vacuum tube sound courtesy of the Nutube preamp. The three-channel design provides an independent volume control for each channel, and CH3 also supports mic input, which allows this mobile keyboard amp to double as a simple and portable PA system. A full complement of input/output jacks is also provided, including an AUX IN jack, headphone jack, and a LINE OUT jack for connection to a professional PA system. This amp is also ideal for on-stage use as a monitor amp, or as an at-home practice amp that will pair perfectly with your keyboard collection.


- 50 watts of output power; Nutube-equipped preamp
- 8" coaxial speaker; Bass reflex structure enhances low-end read more
- Three-channel design, with independent volume controls
- Three-band master EQ for ultimate control
- Aux In, Headphones Out & Line Out
WARNING: Cancer and Reproductive Harm - www.p65Warnings.ca.gov.
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Input/output jacks:
- INPUT CH1: 1/4" phone jack (unbalanced)
- INPUT CH2: 1/4" phone jack (unbalanced)
- INPUT CH3: 1/4" phone jack (unbalanced) mic/line switchable
- AUX IN: 1/8" stereo mini phone jack
- Headphones: 1/8" stereo mini phone jack
- LINE OUT: 1/4" phone jack (unbalanced)

- MIC channel: REVERB

- BASS: ±10dB@100Hz
- MIDDLE: ±10dB@700Hz
- TREBLE: ±10dB@10kHz

Misc Specs
- Phantom power: +15 V
- Valve: Nutube 6P1
- Output power: Maximum approx. 50W RMS
- Speaker: Vox Original 8" speaker with tweeter (2-way coaxial)
- Power supply: AC adapter (DC 19V)
- Current consumption: 3.42A
- Dimensions (W x D x H): 354 mm -- 208mm -- 313mm / 13.94" -- 8.19" -- 12.32"
- Weight: 4.1 kg / 9.04 lbs.
- Included items: AC adapter (DC 19V), power cord
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 12.5 lbs
Shipping Dimensions: 17 x 15 x 10 in
Manufacturer Part Number (MPN): VX50KB

For support or warranty questions, please contact the manufacturer:
Phone: 631-390-6500

Reviewers gave this product an overall rating of 5 out of 5 stars. (1 ratings)
Submitted July 26, 2021 by Al E in New Rochelle, NY

"Amp? Feels like a lunchbox!"

Overall: 5 out of 5 stars
(see rating details)
Verified Customer zZounds has verified that this reviewer made a purchase from us.
Amazing how much sound comes out of this incredibly light amp. Is it loud enough for a high volume rock band? Well….not by itself but put the line out through a larger unit and this thing smokes! Full range great quality sound and tube warmth and at practice it’s fine all alone. Word of caution. Specs are incorrect. There are no effects or phantom power built in seems like an honest mistake. Sure beats lugging my Roland KC500 (70 lbs) around and if I need more volume I put it through my Mackie Thump 12 (30lbs). All bought from Zzounds they are the best for speedy shipping customer service and payment plans. Buy this amp but not from anyone else. You will not be disappointed.

Musical Background:

Rock pop blues jazz

Musical Style:

Keyboardist vocalist for 50+years
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