D.W. Fearn VT-24
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 designLo-Z input position for superior performance with transformerless micsPhase (polarity) reverse switch+48 volt phantom power (completely disconnected when off)Custom-design Jensen input and output transformers20 dB input pad (switchable)True VU meters (amplifier isolated)All point-to-point audio wiringGold input and output XLR connectorsPolypropylene and polystyrene coupling capacitorsAll audio switching through gold-contact, sealed precision relaysInternational operation on 100, 120, or 220 VAC, 50/60 HzCE certified, RoHS-compliant+4 dBm outputConservatively rated precision components and rugged construction for stability and long life
Input 150 ohmsInput Load Impedance 1.5k ohmsMinimum Input Level -65 dBm nominalMaximum Input Level @ 20 cps -30 dBm without pad, -5 dBm with 20 dB padGain: 53 dBFrequency Response +/-0.25 dB 20 cps to 20 kc; -3 dB @ 0.5 cps and 55 kcTHD+Noise less than 0.25% 20 cps to 20 kcIntermodulation Distortion SMPTE less than 0.02%Signal to Noise Ratio 74 dB minimumEquivalent Input Noise -124 dBm maximumOutput low-Z, transformer-balancedMaximum Output Level +22 dBm, 20k ohm loadPower Requirements 100, 120, or 220 VAC, 50/60 HzDimensions 19" (48.26cm) W, 5.25" (13.34cm) H, 14" (35.56cm) D
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