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Dual Balanced/Unbalanced Line Amplifier -12 to 20 dB Gain


•Up to 20 dB Gain in an Audio Line
•Conversion from Balanced to Unbalanced
•Conversion from Unbalanced to Balanced
•Conversion from High to Low Impedance
•Conversion from Low to High Impedance
•Bridge an Audio Line Feed
•Precisely Match Audio Levels

The STA‑1 is a dual‑channel line‑level preamplifier with bridging inputs, adjustable gain or loss, and low‑impedance outputs. Each of the two identical circuits is both an electronic line transformer and a line amplifier. Hook up the STA‑1 just like a pair of audio transformers with gain. True dc amplifiers produce unsurpassed audio clarity, high common‑mode rejection, ultra‑low distortion and low noise. The STA‑1 is perfect for most line amplification, impedance or balanced/unbalanced conversion.

The STA‑1 operates from floating or bipolar dc power. For installations where ground‑referenced power is preferred, use the STA‑2A Dual High Gain Line Amplifiers.

Typical Performance:

Amps per STA‑1:
2 identical circuits (stereo or dual mono operation)

20 dB (adjustable, separate controls for each channel)

Input Impedance:
10 kΩ bridging

Input Configuration:
Balanced or unbalanced

Output Impedance:
200 Ω balanced (drives 600 Ω or 10 kΩ lines)

Output Configuration:
Balanced or unbalanced

Frequency Response:
dc to 25 kHz (+/‑ 0.25 dB)

0.003% to 0.009%; (0.005% nominal)

Output Level:
+4 dBu

18 dB (at rated output of +4 dBu)

‑80 to ‑85 dB (referred to +4 dBu);
‑98 to ‑103 dB (referred to +22 dBu)

‑70 dB to ‑80 dB (100 Hz)

Better than 75 dB

Power Requirement:
FLOATING, 24 to 33 Vdc @ 50 mA

Ambient Operating Environment:
0° C to 55° C


Add to Cart:

  • Model: STA-1
  • Shipping Weight: 0.5lbs
  • 10 Units in Stock
  • Manufactured by: RDL -Radio Design Labs

This product was added to our catalog on Friday 04 June, 2010.

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