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AML 52F50 500-Series Compressor - Used  From API

2-slot 500-Series Compressor, based on the Neve 5254 Diode Compressor


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API Audio

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Manufacturer's Description from API

The 52F50 Compressor module is intended for professional application use in the API 500 series VPR racks and Lunchbox.

The 52F50 is a double wide 500 series compressor based on the vintage Neve 2254, minus the limiter section. The comp uses a Carnhill input transformer, diodes, a interstage transformer, a BA Neve style amplifier and Carnhill output transformer. The comp has a mighty warm, creamy and thick sound; great for warming up single source, but when using a pair in stereo they also excel when used on a group or stereo buses.

Description of Front Panel:

• System Bypass/In Toggle Switch

• Compressor Off/Slow/Fast Attack Speed Toggle Switch

• Side-Chain Filter Frequency Toggle Switch

• Meter Select: Input/Gain Reduction/Output Toggle Switch

• Compressor Ratio 1.5:1 / 6:1 Grayhill Rotary Switch

• Compressor Threshold -17/+10 Grayhill Rotary Switch

• Compressor Release Time 25mS/1.5mS/Auto Grayhill Rotary Switch

• Compressor Make-Up Gain 0/+20 Grayhill Rotary Switch


• Input: AML/Carnhill transformer balanced (AML-18-003/VTB9045M)

• Interstage: AML/Carnhill transformer balanced (AML-18-002/VTB9045M)

• Output: Carnhill transformer balanced (Classic VTB2569 full size output transformer)

• Vintage Style VU/Gain reduction meter

• Grayhill Stepped Rotary Switch

• Fast/Slow Attack

• HPF Sidechain

• Stereo Link through XLR

• Double Wide (take 2 spaces)

• Vintage Style Diode Bridge Compressor

API Audio

About Manufacturer

API (Automated Processes, Inc.) is world famous for its all-discrete audio products: studio and broadcast mixing consoles, and a full line of rack mount mic preamps, equalizers and processors. It all began with a dream. It was 1968. The company: Automated Processes Inc., formed by men with a vision. Best known for their now legendary "2520 amplifier", this unique amp has been and will continue to be the heart of all API discrete products. It continues to provide reliability and sonic purity unmatched by the competition. The resulting console met the needs of the music, commercial and broadcast industry. API became the leading audio broadcast console manufacturer for radio and television networks and high profile stations. In addition, recording studios, large and small, began using API.....and receiving rave reviews from engineers and producers. There are over 700 API consoles across the nation and around the world, including the three major networks. Over thirty years later, many of these consoles are still in daily use in some of the most prestigious recording and broadcast facilities in the world because, to date, there are few, if any consoles of equal sound quality at a cost-effective price.