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IGS Alter 500

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Monophonic FET Limiting Amplifier

 

The ALTER 500 is a FET compressor built in the 500 standard. The FET-type solution was used for the first its application in the legendary UREI 1176 compressor from the 70s. The ALTER is a single-channel unit with stepped input and output controls. The Ratio switch has six positions, including two additional to the original 1176 1:1 and 2:1 settings. Slam Mode can be turned on with a separate switch, working regardless of the Ratio settings. Attack and release times can be set to Fast / Mid / Slow with 3-pole switches.

The compressor is equipped with a relay bypass on the front panel. The input is balanced with a modern, low-noise op amp and the output with a Carnhill transformer. The circuit has two amp stages, between which is the output control. The stage amps are based on the discrete 990 circuit. The level of gain reduction is shown by a 20 point led bar.

DEVICE TYPE
Fet Compressor Yes
BASIC FEATURES
All stepped manipulators Yes
INPUT & OUTPUT
Input Impedance (balanced) 10k ohm
Output Impedance (balanced) 600 ohm
Audio transformers Yes, Carnhill
LEVELS
Operating Level +4 dBu
Max input level +20 dBu
Max output level +22 dBu
Noise Level -99 dBA
Max. gain 36 dB
Max Gain Reduction 20 dB
TIME CONSTANTS
Attack: 20us, 400us, 800us
Ratio 1:1 to 20:1
Release: 50ms, 600ms, 1.1s
BANDWIDTH
Fequency response 8 Hz to 20 kHz, +/- 0.1dB
DISTORTION (@ 20 HZ - 20 KHZ)
THD+N 0.012%
POWER
Power consumption 2.5W
PACKING BOX
Shipping weight 1kg

 

 

 

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