Seventh Circle Audio J99-500 (SC90)
Jensen Twin Servo / John Hardy 990C-style discrete op-amp mic preamp module, 500-series format
Preamp$499Manufacturer list price
Specifications
- Type
- Preamp
- Description
- Jensen Twin Servo / John Hardy 990C-style discrete op-amp mic preamp module, 500-series format
- Topology
- Transformer-coupled, discrete op-amp (Jensen Twin Servo / John Hardy 990C-style), JLM/Jensen lineage, no signal-path capacitors
- Signal path
- Analog
- Channels
- 1
- Channel format
- mono mic/line preamp
- Form factor
- module (API 500-series/Rev G format)
- Connection
- API 500-series (Rev G) lunchbox format
- DSP
- false
- Powered
- true
- Impedance (Ω)
- 1200 / 300 (switchable)
- Country of manufacture
- USA
- Phantom power
- 48V
Details
Controls: 12-position Grayhill stepped gain switch (15-70dB in 5dB steps), gain trim (up to 6dB cut), phase reverse switch, phantom power switch, switchable input impedance (1200/300 ohm)
I/O: 500-series edge connector I/O; Lundahl 1538XL input transformer, CineMag CMOB-2H output transformer
Notes: Clones Jensen Twin Servo / John Hardy 990C-style topology (JLM/Jensen family); EIN approaching -130dB as published; up to 76dB gain at 300-ohm setting. FLAG: genuine API 500-series-compatible module, will NOT work in SCA's CH02/PC01 chassis -- distinct from the SCA-proprietary-format 'J99' classic-series module. Available as DIY kit or assembled.