Apparantly Maxon is about to release a new Compressor/Limiter...
Read more here:
MAXON Home Page 
RTC600 SPECIFICATIONS
Input Impedance 500k ohms
Output Impedance 10k ohms
Maximum Output Level +20dBu (at 1kHz)
Residual Noise -94dBu or less (Input shorted, IHF-A weighted)
T.H.D.+N 0.02% or less (at 1kHz, -10dBu output)
Control THRESHOLD 0dBu to -40dBu
RATIO 1:1 to infinity:1
GAIN 0dB to +30dB
ATTACK (for 20dB gain decrease) 20mSec to 600mSec
RELEASE (for 20dB gain increase) 140mSec to 700mSec
Switch BYPASS/EFFECT (Mechanical True Bypass using 4PDT switch)
I/O INPUT JACK, OUTPUT JACK, DC INPUT JACK
Indicator BYPASS/EFFECT LED
REDUCTION LED (When REDUCTION LED lights, compression is more than 4dB.)
Internal Circuit Voltage ±12.5V(DC to DC Converter)
Power Consumption 240mA/9VDC
Dimensions 121(W)×152(D)×60(H)mm (with protrusion)
Weight Approx. 580g (without AC adaptor)
Power Supply AC adaptor AC2009
Accessory AC adaptor AC2009
Oops...I saw too late that somebody has already started a thread over here
Maxon RTC600 Tube Compressor?
