TUBEWORKS 4002 TUBE DIRECT BOX

This is the first known tube cathode balanced direct box ever designed. This break-through design results in the elimination of the typical output transformer. The elimination of the distortion-prone and frequency response-limiting output transformer coupled with the addition of a low-noise comparator-type input amplifier has resulted in a literal order of magnitude advance in performance for this studio quality device. While using the RTD, you will notice the almost total lack of microphonics along with one of the lowest noise floors in the industry for tube-type studio gear. The noise parameter was very carefully considered in the design phase. WHY USE A DIRECT BOX? The output impedance from your instrument (guitar, bass, etc.) is traditionally quite high impedance. This means that a relatively small electrical disturbance (hum and static from fluorescent lights, or proximity to power AC lines, for example) can sometimes get into your signal line and then be amplified along with the good musical signal you want. Additionally, high impedance is prone to capacitive losses in the guitar cord itself, reducing the high-end response of your instrument. The RTD will convert your instrument’s high impedance output to a very low (less than 100 ohms) output. This output can then be sent through a much longer cable (50 feet is not uncommon) without any additional hum pick-up or high end losses. Your instrument will be noticeably brighter and actually more “direct” sounding. Conversion to low impedance makes the musical electrical signal virtually immune from outside interference. In addition to providing low impedance output, your RTD also converts your single-ended (2-wire) instrument signal into a professional true balanced (3-wire) microphone level send for direct connection to the microphone input of a mixing console. The above-mentioned functions of the RTD are pretty typical of most garden-variety direct Boxes. What is not typical of the RTD vs. other typical direct boxes is the incredible REAL TUBE tonal enhancement the RTD gives your instrument!! All outputs are direct “Class A” tube. Be forewarned: after experiencing the RTD, other direct boxes will fail to satisfy. SPECIFICATIONS Input Voltage Range ….…………………………………. 0 to 3.8 Volts RMS(45 Volts max. In “SPEAKER” mode)Max. Output Voltage (Unity) …………………..………………… 3.8 Volts RMS(Normal, Balanced) .. …….………….. 0.5 Volts/phase ref. to pin 1(1.0 Volts, differential)Output Impedance ……………………………….Line & Balanced: 100 ohms(Usually 65 is best)Signal/Noise Ratio ……………………………………………Better than 90dBHum & Noise ……………………….Better than -75dB (unweighted, no load)Distortion (THD) …………….…………….…….Less than .05% (usually .oq%)Liberal depends on weightingFrequency Response …….….…………….15 Hz – 50,000 KHz (+/- 0.25dB)x unheard of tenth 20-40 flat tenth of a dBPower Requirement ………………………………. 30 VAC, 600mA (External)Tube Comple