Tube Works 4001 User Manual

a division of Genz Benz Enclosures, Inc.
7811 E. Pierce St. ¡ Scottsdale, AZ 85257
Ph: 480.941.0705 Fax: 480.946.2412
www.genzbenz.com
WARRANTY
Real Tube Direct is warranted for a period of THREE FULL YEARS against
defects to the original, registered owner provided he/she has returned a
completely filled-out OWNER'S REGISTRATION CARD.
This warranty covers parts and labor only; shipping charges remain the sole
responsibility of the owner.
Damage due to modification or abuse is excluded from this warranty.
Before returning any unit for service, a RETURN MERCHANDISE
AUTHORIZATION NUMBER (RMA#) must be obtained by calling
480-941-0705.
4001/4002
Direct Box
OWNER’S MANUAL
We thank you for your purchase of the most innovative direct
box on the market. B.K. Butler’s proprietary circuitry patented.
This is the first known tube cathode balanced direct box ever
designed.
This break-through design results in the elimination of the typi-
cal 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 perform-
ance for this studio quality device.
While using the RTD, you will notice the almost total lack of mi-
crophonics along with one of the lowest noise floors in the in-
dustry for tube-type studio gear. The noise parameter was
very carefully considered in the design phase.

Tube Works 4001 Specifications

Electrical Specifications

input voltage range	0 to 3.8 Volts RMS
max output voltage (unity)	3.8 Volts RMS
output impedance	100 ohms

Performance

signal/noise ratio	Better than 90dB
hum & noise	Better than -75dB
distortion (THD)	Less than .05%

Frequency and Power

frequency response	15 Hz - 50, 000 KHz (+/- 0.25dB)
power requirement	30 VAC, 600mA
tube complement	12AX7A

Summary

Warranty

Why Use A Direct Box?

Features

Boost/Normal Switch

Controls balanced output level from -24dB to -12dB relative to input.

Lift/Ground Switch

Lifts and isolates DC common ground from pin 1 of balanced output.

Power/On Switch

Supplies power to internal circuits; green LED indicates status.

Speaker/Normal

Selects instrument input mode or line/mic send from amplifier speaker output.

Side Panels

Input

Accepts instrument to line level inputs with 1 Meg Ohm impedance.

Speaker/Loop Out

Hard-wired signal loop out identical to the input signal.

Output

Unity-gain Real Tube Direct output for connection to amplifier input.

True Balanced

True balanced output for connection to a mixing console mic input.