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High-end, 3-stage 73-style 500 series microphone/DI preamplifier featuring 80 dB of British-style gain, all discrete through-hole components, and Class-A circuitry
The Heritage Audio 73JR II is an update to the already classic 73JR — a true 73 style mic preamp in a single 500 series slot, with some added features that will satisfy the most demanding of recording engineers. Employing discrete circuitry and conventional components, the 73JR II is a faithful 3-stage all Class A 73 preamp. Styroflex and tantalum capacitors have been used throughout. No corners were cut.
The all-discrete Class A hi-pass filter is sweepable from 20 to 220 Hz — making it easier to make your low end tighter without affecting desired frequencies. The Line mode allows for reamping of prerecorded tracks, and is a perfect solution for adding some color to lifeless recordings. The DI input (which automatically switches to DI mode when inserting a ¼" TS cable) is an all-discrete Class-A JFET circuit in front of the microphone transformer — giving you all of the color and weight you could ask for.
Finally, special care has been taken with power handling, implementing internal +24V slow-turn-on-regulation. This is extremely healthy for your 500 series enclosure’s power supply, and keeps the 73JR II’s power independent from other slots.
There are several compromises usually made when adapting a 73 preamp for the 500 Series, but none that you will find in the 73JR II. The 73JR II uses the full 3 gain stage circuit for up to 80 dB of gain with noise of -125 dBu EIN all over the gain positions. The 73JR II uses a true 24volt onboard power supply for identical performance and distortion point.
The 73JR II uses only discrete, through-hole traditional components and hand labor for that great 70s vibe. The output transformer is a custom Carnhill, made for in the St Ives factory. The input transformer is a custom Carnhill, made in Carnhill's Oxford factory — this one has a huge impact on the extra mojo of the unit, and is the same one found in our higher-end 80 Series modules.
|Module Type||500 Series|
|Module Slot Count||1 Slot|
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