Incorporating true class A/B switching, the VTB-1 is a totally discrete circuit. Unique to the VTB-1 is the "Tube Drive". The Tube Drive is a variable drive to a 12AX7, that allows the user to blend as little, or as much of the Tube Drive they want. This VTB-1 allows the user the most flexibility of any mic preamplifier in it's price class.
The VTB-1 allows you to go from a pristine solid state sound, to any combination of Tube Drive you choose...even hard distortion for guitars and bass! The VTB-1 is must have device as the perfect mic preamplifier for any microphone!
Features:
Maximum Gain : Mic In to Bal Out: 72dB (60dB preamp gain, 12dB output gain) Line In to Bal Out: 42dB (30dB preamp gain, 12dB output gain)
Distortion/Noise (THD + Noise): -20dBu input-Mic; 0dBu input-Line Both measured at +15dBu output
Mic or Line In to Bal or Line Out: <0.0015% (Blend set full CCW- no tube)
Mic EIN: -128dBu (150 ohm source, 60dB gain)
Frequency response (20-20kHz, ref 1kHz): -20dBu input, +15dBu output
Mic In to Bal Out: +0 /-0.25 dB
0dBu input, +15dBu output
Line In to Bal Out: +0 /-0.5 dB
Phase response: <+/- 15 degrees
Input impedance: Mic Input (Rear switch in 200 ohm position): 2000 ohms
Mic Input (Rear switch in 50 ohm position): 300 ohms
Line Input (Front panel TRS jack): 1.5 meg ohms
Output impedance: Male-XLR Balanced Output: 100 ohms (50 ohms each leg)
TRS Line Out: 300 ohms (Impedance Balanced)
Insert Jack (TRS): Nominal level approx 0dBu Located between SS preamp stage and tube/output stage Tip=Send: 50 ohms output impedance Ring=Return: 7500 ohms input impedance
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