Fredenstein F602, analoge Tube Compressor 500 Series Module, Double Triode Tube 6386 LGP, transformer-less input circuit, Lundahl LL1517 Output Transformer, illuminated VU-Meter with switching Gain-Reduction / Output Level View, Clip-LED (+24 dBu), switchable Hard-/Soft-Knee Function, Attack Time Range: 250 us to 15.5 ms, Release Time automatic or manual from12 ms up to 5 sec. adjustable, Compression Ratio from 2:1 up to 20:1 adjustable, compressed and uncompressed Signal mixable, Housing: 500 Series Module