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Table of Contents
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Table of Contents
Summary of Contents for DIYRE 73P
- Page 1 MIC PREAMP Operation Manual...
- Page 3 Welcome to your 73P Preamp. The 73P is an authentic recreation of the most famous British mic preamp of all time (you know the one). All efforts were made to ensure it functions and sounds as close as possible to the original and is a joy to use.
- Page 4 Controls Gain Controls the amount the input signal is Engages Line mode, reducing the input amplified by 25dB and setting impedance for line level. Uses the same input as a Ø microphone in your 500-series chassis. Reverses the polarity of the signal Trim Attenuates the signal between the Lo Z...
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Page 5: Block Diagram
GAIN SETTINGS 55-70 MIC IN LO Z PREAMP GAIN XFMR SETTINGS 0-50 +6dB -40-0dB +30dB PREAMP +18-28dB LINE OUT OUTPUT TRIM XFMR POLARITY +18dB Block Diagram Audio enters the through the input stage, affected by the LO Z impedance, V phantom power, and switches. -
Page 10: Specifications
Specifications Microphone Input Gain: 0-70dB Impedance (Lo Z out): 1.2kΩ Impedance (Lo Z in): 300Ω DI Input Impedance: 1MΩ Attenuation: 35dB Line Input Impedance: 4.7kΩ Attenuation: 25dB Line Output Max Output Level: +25dBu Trim Range: -80dB to 0dB General Frequency Response: ±0.2dB 20Hz to 20kHz rel. 1kHz EIN (Equivalent Input Noise): -128dBA, 20Hz to 20kHz, input terminated with 150 Ohms Power Rails: ±16vDC, +48vDC... -
Page 11: Replacement Parts
Replacement Parts Below is a list of off-the-shelf components (other than custom parts) should you need a replacement down the road. For parts listed ‘DIYRE’ please contact us for replacements at diy.re/contact REFERENCE DESIGNATOR VALUE MAN. PART NUMBER SOURCE C1, C31 150uF/6.3v... - Page 12 As with any electronic device, operating the 73P safely requires some common sense and respect for the dangers of electrical power. Treat your 73P like a hair dryer. Don’t turn it on when it’s wet, only clean it with a dry cloth, and if you spill a liquid on it unplug it immediately and don’t turn it back on until it’s been repaired by a tech.
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