MPN #VT-24    

$11969.00

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Four-Channel Vacuum Tube Microphone Preamplifier



Like most of our products, the VT-24 came about because it was something I needed for my own recording projects. I wanted to record every microphone with VT-1/VT-2 mic preamps, but I was running out of rack space in my small control room. A four-channel version of the VT-2 would double my preamp capacity in the same space.

I did not want to compromise on the sound nor on the features of the VT-2. The VT-24 uses the identical circuit and custom Jensen input and output transformers as all our mic preamps. It has four true VU meters, but they are smaller than on a VT-1/VT-2. Specs are the same as a VT-2, and, most importantly, the sound is exactly the same.

The VT-24 has eight tubes, but it runs cool enough that no fan is required, so you can have next to live mics without a problem.

One thing that we did have to eliminate in the VT-24 is the meter switch. But the 48V phantom power, 20dB pad, and special input selection for Low-Z microphones are just like on a VT-1/VT-2. The power switch is on the front panel.
  • All vacuum-tube design
  • Lo-Z input position for superior performance with transformerless mics
  • Phase (polarity) reverse switch
  • +48 volt phantom power (completely disconnected when off)
  • Custom-design Jensen input and output transformers
  • 20 dB input pad (switchable)
  • True VU meters (amplifier isolated)
  • All point-to-point audio wiring
  • Gold input and output XLR connectors
  • Polypropylene and polystyrene coupling capacitors
  • All audio switching through gold-contact, sealed precision relays
  • International operation on 100, 120, or 220 VAC, 50/60 Hz
  • CE certified, RoHS-compliant
  • +4 dBm output
  • Conservatively rated precision components and rugged construction for stability and long life
  • Input 150 ohms
  • Input Load Impedance 1.5k ohms
  • Minimum Input Level -65 dBm nominal
  • Maximum Input Level @ 20 cps -30 dBm without pad, -5 dBm with 20 dB pad
  • Gain: 53 dB
  • Frequency Response +/-0.25 dB 20 cps to 20 kc; -3 dB @ 0.5 cps and 55 kc
  • THD+Noise less than 0.25% 20 cps to 20 kc
  • Intermodulation Distortion SMPTE less than 0.02%
  • Signal to Noise Ratio 74 dB minimum
  • Equivalent Input Noise -124 dBm maximum
  • Output low-Z, transformer-balanced
  • Maximum Output Level +22 dBm, 20k ohm load
  • Power Requirements 100, 120, or 220 VAC, 50/60 Hz
  • Dimensions 19" (48.26cm) W, 5.25" (13.34cm) H, 14" (35.56cm) D
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