The 54F50 is a Class A, compressor and limiter module which occupies three slots in a 500 series rack. Fully populated with Carnhill transformers to achieve its distinctive classic sound. This high-end hand-built British module provides an affordable solution for the modern cost conscious studio.Features Classic 4 stage (Class A) amplifier, 4 transformer designAll discrete component (no surface mount devices)Entirely hand assembled and tested in the England to exacting quality standards.Line Input: Carnhill transformer balanced (Mu-metal screened Classic VTB9046), 10k Input ImpedanceInterstage: Carnhill Mu-metal screened Classic VTB9045 and VTB9046Line Output: Carnhill transformer balanced (Classic full size output transformer)Compressor: (Class A) amplifier designRatio 1.5:1, 2:1, 3:1, 4:1 & 6:1Dual attack speeds (Fast = 5mS, Slow = 25mS) *Make-up gain 0dB to 20dB in 2dB stepsRecovery (release) 400mS, 800mS, 1.6S & AutoThreshold –20dBu to +10dBuLimiter: (Class A) amplifier designDual attack speeds (Fast = 100uS, Slow = 5mS) *Recovery (release) 100mS, 200mS, 800mS & AutoThreshold +4dBu to +12dBu (in 1dB steps)Stereo link via either the backplane edge connector, an XLR or bothIlluminated meter selectable for input, output or gain reduction metering.Power off signal bypass Entirely stainless steel chassis.Total current consumption 150mA (per unit)Also available supplied as a pair in a box containing a “mono/stereo” switch* These are the default factory settings however the; Compressor “Fast” may be internally jumper selected to 0.5mS Compressor “Slow” may be internally jumper selected to 50mS Limiter “Fast” may be internally jumper selected to 1mS Limiter “Slow” may be internally jumper selected to 25mS