Twin-Servo
A single-channel 500 series microphone preamp built around two cascaded discrete JE-990 op-amps with Jensen transformers on input and output. It suits studio engineers who need a wide-bandwidth, low-distortion preamp for condenser, ribbon and DI sources.
- Two cascaded discrete JE-990 op-amps
- 60dB of gain
- Frequency response 0.5Hz to 150kHz
- Oversized Jensen transformers at input and output
- No capacitors in the audio signal path
- 500 series module format
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The Twin-Servo is a 500 series mic preamp based on the Jensen JE-990 circuit first developed by Deane Jensen in 1988. Two fully discrete 990 op-amps are cascaded to provide 60dB of gain, giving lower distortion and wider bandwidth than a single-stage design, along with reduced noise at low and mid signal levels.
All capacitors are removed from the audio path and replaced by two DC servo feedback circuits to limit phase shift. Oversized Jensen transformers sit at both input and output, giving a stated frequency response of 0.5Hz to 150kHz and a large amount of headroom. The circuit runs in Class-A before moving to Class-AB at higher levels.
It can be used with condenser microphones, ribbon microphones (a Radial McBoost can add up to 25dB for very low-output vintage ribbons, for about 85dB total) and active DIs such as the Radial PZ-DI. As a 500 series module it mounts in a compatible rack such as the Radial Workhorse Power Rack.
Sonraíochtaí
- Branda
- Radial Engineering
- Samhail
- Twin-Servo
- Catagóir
- Stiúideo › Réamhmhéadaitheoirí agus outboard
Audio
- Gain
- 60dB
- Frequency response
- 0.5Hz to 150kHz
- Circuit
- Jensen JE-990, two discrete op-amps cascaded
- Transformers
- Oversized Jensen, input and output
- Signal path
- Capacitor-free, two DC servo feedback circuits
- Operating class
- Class-A transitioning to Class-AB
- Maximum gain with McBoost
- About 85dB
Physical
- Format
- 500 series module
- Type
- Microphone preamplifier
- Part number
- R700 0111 10
Compatible accessories
- Rack mounting
- Radial Workhorse Power Rack
- Mounting screws
- ThumbSet Screws, set of 12 screws and washers
- Gain booster
- Radial McBoost, up to 25dB
- Active DI
- Radial PZ-DI