RTZ Professional Audio - 9762A Microphone Preamplifier

(No reviews yet) Write a Review
Usually ships within 24 hours
3.50 LBS
Calculated at Checkout
  • RTZ Professional Audio - 9762A Microphone Preamplifier
  • RTZ Professional Audio - 9762A Microphone Preamplifier
  • RTZ Professional Audio - 9762A Microphone Preamplifier
  • RTZ Professional Audio - 9762A Microphone Preamplifier
  • RTZ Professional Audio - 9762A Microphone Preamplifier


The 9762A delivers the same +27dBu output level drive capabilities as the original 9762 rack unit. Internally the 9762A uses dual linear regulators with an isolated virtual ground architecture to achieve true 24V operation and no switching supplies are needed. This approach allows the 9762A to deliver the same high output level drive capablities without sacrificing any signal overhead or the line driver and gain block performance.

Since the entire preamp is fully transformer isolated from input to output, the virtual ground technique doesn't require the use of expensive switcher modules and the reliability/noise concerns these bring. The 9762A uses the same style transformers and the same gain block and line driver circuitry as the original rack mount unit.

The 9762A also includes a few new features not found in the 19" unit version. We added an all discrete 100Hz -12dB/octave high pass filter to roll off undesirable low frequency content when needed. You'll also notice that we've expanded the LED VU meter to 8 segments and improved the meter balistics. The SP (signal present) and OL (overload) LED indicators provide the same visual indicators with peak hold indication. The heavy duty gain switch and output level potentiometer are the same exact parts as used in the original design.

The standard unit contains a single channel of high gain amplification capable of providing up to 75 dB of gain. All balanced input and output signals are fully transformer isolated. The output transformer is a custom Sowter part made specifically for the 9762A format. Standard features include +48V Phantom power, polarity (phase) reverse, DI source select, microphone impedance select and 100 Hz low pass filter.


  • Dual gain block Neve style structure with up to 75db overall gain
  • Fully balanced transformer I/O's (+27dbu max output)
  • Low noise internal power supply fully mu-metal shielded
  • Selectable High/Low-Z input mic impedance
  • Switchable 100Hz Low Pass Filter
  • Independent regulation and fuse protection per channel
  • Super Hi-Z FET instrument DI input (switch selectable)
  • Improved 8-segment VU meter
  • All discrete components in the signal path
  • Very musical British style microphone preamplifier
  • Up to 75 dB of gain and +27dBu output levels
  • Super high quality Lundahl mic input transformer
  • Custom Sowter line output transformer
  • Discrete 100Hz -12dB/octave high pass filter
  • Switchable FET buffered direct instrument input
  • Microphone impedance select switch
  • Precision eight segment output level VU meter
  • Input stage signal present and overload LED indicators
  • Long life conductive plastic level potentiometer
  • Long-life electrolytic capacitors
  • Four layer PCB’s with meticulous layout and grounding
  • Full 5-Year limited warranty against defects
  • Hand built in the USA
View AllClose


Recommended Source Impedance 200Ω balanced
Recommended 9762A Load Low-Z (600Ω)
Maximum Input Level 0 dBu
Output Level +27 dBu Maximum
Maximum Gain 75 dB
Frequency Response 20 Hz to 50 kHz ±1.5dB
Output Distortion (THD+n) 1% THD, 22kHz B/W Low-Z mode, 150-Ohms source, 27 dBu
Input Sensitivity –75 dBu to –20 dBu for +4 dBu output
Input Referred Noise -106dBu Unweighted Noise, Lo Z Mode 22kHz Bandwidth
Power Requirements +/-16 VDC, 120mA
Temperature Range 10 C to 50 C
Shipping Weight Approximately 2 lbs
Dimensions 5.25” (H) x 1.5”(W) x 5.6”(L)

View AllClose

0 Reviews

View AllClose