{"product_id":"igs-audio-alter-500-monophonic-fet-limiting-amplifier","title":"IGS Audio Alter 500 Series Monophonic FET Limiting Amplifier","description":"\u003cp\u003eThe \u003cstrong\u003eIGS Audio Alter 500\u003c\/strong\u003e is a monophonic 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.\u003c\/p\u003e  \u003cp\u003eThe 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.\u003c\/p\u003e  \u003cp\u003eThe 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.\u003c\/p\u003e  \u003ch3\u003eSpecifications:\u003c\/h3\u003e  \u003cul\u003e \u003cli\u003eFET Compressor\u003c\/li\u003e \u003cli\u003eAll stepped manipulators: Yes\u003c\/li\u003e \u003cli\u003eInput Impedance (balanced): 10k ohm\u003c\/li\u003e \u003cli\u003eOutput Impedance (balanced): 600 ohm\u003c\/li\u003e \u003cli\u003eAudio transformers: Carnhill\u003c\/li\u003e \u003cli\u003eOperating level: +4 dBu\u003c\/li\u003e \u003cli\u003eMax input level: +20 dBu\u003c\/li\u003e \u003cli\u003eMax output level: +22 dBu\u003c\/li\u003e \u003cli\u003eNoise level: -99 dBA\u003c\/li\u003e \u003cli\u003eMax gain: 36 dB\u003c\/li\u003e \u003cli\u003eMax gain reduction: 20 dB\u003c\/li\u003e \u003cli\u003eAttack: 20us, 400us, 800us\u003c\/li\u003e \u003cli\u003eRatio: 1:1 to 20:1\u003c\/li\u003e \u003cli\u003eRelease: 50ms, 600ms, 1.1s\u003c\/li\u003e \u003cli\u003eFrequency response: 8Hz - 20kHz, +\/- 0.1dB\u003c\/li\u003e \u003cli\u003eTHD+N: 0.012%\u003c\/li\u003e \u003cli\u003ePower consumption: 2.5W\u003c\/li\u003e \u003c\/ul\u003e","brand":"IGS Audio","offers":[{"title":"Default Title","offer_id":44449849376871,"sku":"55383","price":826.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/8848\/5479\/files\/igs-audio-alter-500-2026_55383_1_af346ada-33e6-4010-b37b-b0e9bff0b232.jpg?v=1787090684","url":"https:\/\/vintageking.mom\/products\/igs-audio-alter-500-monophonic-fet-limiting-amplifier","provider":"Vintage King","version":"1.0","type":"link"}