Model IFB Plus Series Talent Amplifier Data Sheet

50144-1213, Issue 3

The Model 33A is an update of the popular Model 33 Talent Amplifier. The Model 33A includes the addition of a

3.5 mm output jack, along with updated internal circuitry. In all ways the Model 33A meets or exceeds the perfor

mance of its predecessor.

The Model 33A is compatible with virtually every standard IFB and party-line intercom circuit, including those associ

ated with equipment from RTS®, Clear-Com®, and Studio Technologies. This type of circuit typically uses a 3-pin

XLR connector for interfacing with connected equipment. Electrically, XLR pin 1 serves as common for DC power

and audio; pin 2 provides DC power and, in the case of a dual-channel circuit, DC power and channel 1 audio; pin 3

provides channel 2 audio for dual-channel systems, or channel 1 audio in single-channel systems.

Specifications

Applications: directly compatible with talent amplifier output on Model 2A Central Controller;

also compatible with standard single- and dual-channel IFB and party-line intercom circuits

Indicator Light: red LED indicates operation of internal power supply

Connectors:

Input: 3-pin female XLR

Loop Through: 3-pin male XLR

Output: ¼-inch and 3.5 mm 2-conductor jacks; sleeve common, tip “hot,” ring not used

IFB/Intercom Input Wiring Scheme:

Pin 1: common for DC and audio

Pin 2: DC with channel 1 audio (dual-channel circuits) or DC only (single-channel circuits)

Pin 3: channel 1 audio (single-channel circuits) or channel 2 audio (dual-channel circuits)

Power Requirement: 18-35 volts DC, 15 milliameres quiescent, 40 milliamperes maximum

Output:

Compatibility: intended for connection to mono (2-conductor) headsets or earpieces with

nominal impedance of 150 ohms or greater

Type: voltage driver

Input/Output Gain: 28 dB, maximum

Maximum Output Voltage: 8 volts peak-to-peak, 1 kHz, 150 ohm load

Frequency Response: 40 Hz-20 kHz, ±1 dB, 150 ohm load

Distortion (THD+N): 0.03%, 1 kHz, 150 ohm load, 0 dBu out

Dimensions (Overall):

3.25 inches wide (8.3 cm)

1.8 inches high (4.6 cm)

3.95 inches deep (10.0 cm)

Mounting: intended for portable applications; contains integral belt clip;

optional mounting adapter kit allows Model 33A to be permanently mounted

Weight:

0.6 pounds (0.3 kg)

Specifications subject to change without notice.

Studio Technologies, Inc.

Skokie, Ill

inois USA

+1 847-676-9177

studio-tech.com