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HERITAGE AUDIO 73JRII Microphone Preamp - DI - Format 500
RHA 73JRII
Mic Preamp - DI - 500 Size
The 73JRII is a 1073 style mic preamp in a single 500 size module with a few extra features that will cover all the recording needs of engineers and musicians.
Using only separate circuits and conventional components, the '73 junior II is a genuine three-stage Class A preamp.
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Styroflex and Tantalum capacitors have been used throughout without compromise.
The handy, fully transparent Class A high-pass filter has been updated and can now be modulated from 20 to 220 Hz. It's now even easier to make your bass tighter without affecting the desired frequencies.
Line mode allows you to modify the recording of pre-recorded tracks and is perfect for bringing Class A color back to recordings lacking life.
The smart switched DI chip (automatically switches from MIC to DI mode when a ¼" MONO jack is inserted) is a fully transparent Class A JFET circuit upstream of the MIC transformer, restoring the full signal. Since its introduction in 2013, it has become a "classic DI" for bass. Finally, special attention has been paid to power management, by applying an internal regulation with slow 24V ignition (about 20 seconds to reach maximum voltage). This makes the power supply of your 500 series box healthier and makes the '73JR independent of other modules.
Features:
- Microphone input impedance: HI, 1200 Ohm minimum, LO, 300 Ohm minimum. Higher gain positions have progressively higher impedances, optimal for low-gain ribbon mics.
- Line input impedance: 10 KOhms bridging, balanced and floating Carnhill transformer.
- DI input impedance: greater than 2 megohms, unbalanced.
- Output impedance: less than 75 ohms, balanced and floating Carnhill transformer, allowing to feed a 600 ohms load (factory terminated).
- Maximum power: greater than +26 dBm for 600 ohms.
- THD: less than 0.025% at 1kHz, less than 0.05% at 100Hz.
- Frequency response: 20Hz (+0.3dB) to 20Khz (-0.2dB)
- Maximum gain: slightly more than 80dB
- Noise: less than -125dBm.
- Power consumption: 86mA per rail at + - 16 VDC.
The handy, fully transparent Class A high-pass filter has been updated and can now be modulated from 20 to 220 Hz. It's now even easier to make your bass tighter without affecting the desired frequencies.
Line mode allows you to modify the recording of pre-recorded tracks and is perfect for bringing Class A color back to recordings lacking life.
The smart switched DI chip (automatically switches from MIC to DI mode when a ¼" MONO jack is inserted) is a fully transparent Class A JFET circuit upstream of the MIC transformer, restoring the full signal. Since its introduction in 2013, it has become a "classic DI" for bass. Finally, special attention has been paid to power management, by applying an internal regulation with slow 24V ignition (about 20 seconds to reach maximum voltage). This makes the power supply of your 500 series box healthier and makes the '73JR independent of other modules.
Features:
- Microphone input impedance: HI, 1200 Ohm minimum, LO, 300 Ohm minimum. Higher gain positions have progressively higher impedances, optimal for low-gain ribbon mics.
- Line input impedance: 10 KOhms bridging, balanced and floating Carnhill transformer.
- DI input impedance: greater than 2 megohms, unbalanced.
- Output impedance: less than 75 ohms, balanced and floating Carnhill transformer, allowing to feed a 600 ohms load (factory terminated).
- Maximum power: greater than +26 dBm for 600 ohms.
- THD: less than 0.025% at 1kHz, less than 0.05% at 100Hz.
- Frequency response: 20Hz (+0.3dB) to 20Khz (-0.2dB)
- Maximum gain: slightly more than 80dB
- Noise: less than -125dBm.
- Power consumption: 86mA per rail at + - 16 VDC.