500 series classic Opto compressor with gain reduction and output volume

The Tegeler Audio Vocal Leveler is a single channel Opto compressor taken from the Vari Tube Recording Channel and adapted to the 500 series format. 

The Tegeler Audio Vocal Leveler offers a simple control layout consisting of Gain Reduction and Output level control knobs and a time constant three-way toggle switch. The time constant switch offers a choice between Slow and fast settings as well as an auto setting for program-dependent behaviour. A large VU meter is also provided to show the amount of gain reduction. A second toggle switch serves as a bypass in/out as well as a link when two units are connected together.

As the name suggests, the Vocal Leveler delivers a stunning performance on vocals with an open and analogue sound while maintaining your sound consistent and upfront. It also works great on bass and other instruments.
Specifications
Frequency Range: 20 - 22.000Hz
Maximum Input Level: 20 dBu
Input Impedance: 2.4k
Output Impedance: < 600
Operating level +4 dBu
Maximum Output Level: 21 dBu
Dynamic Range: 100 dB
Max. Gain Reduction: -12 dB
Voltage: +- 16V
Fuse: -
Power requirement: 80 mA
Measurements: 1 API 500 module width
Weight: 540g
API 500 series mono opto compressor
Two knobs: Gain reduction, Output
3-way switch (left): In, bypass, link for stereo use of two Vocal Levelers
3way switch (right): Attack + Release time: fast, auto, slow (Zeiten rein)