The SK25 and SK99 are discrete Op-Amps which are pin compatible with the API* 2520. They are low noise, high performance DOA's specially developed for audio applications.

The EQ531T is a 3 bands tube equalizer plus High pass filter, built around a dual triode, adapted to the 500 series of API*.

The SK49 is a large diaphragm condenser tube microphone. The design was inspired by the legendary Neumann M49 with the addition of intermediary patterns and a switchable high pass filter.

The SK49 sounds fantastic, warm and clear on all sources.

The MP566 is a dual-triode vacuum tube circuit preamplifier based on a design that has been used in several famous devices from the 50's, which has been adapted to the '500' format of API*.

The EQP501 is a passive equalizer based on the classic PULTEC EQP 1A, adapted to the '500' format of API*.

The MP573 is a two stages, single ended class A preamp, based on the design that was originally used in the Neve 1290/1073 modules, that has been adapted to the 500 series of API.

The PAD500 is a dual balanced line attenuator. It is used after a mic preamp or any effect that you want to drive hot without clipping your converters.

The MP 599 is based on one SK99 discrete Op-Amp, one Lundahl input transformer and one Lundahl output transformer.

The LA502 is a soft knee, electro-optical compressor based on the LA2A/LA3A design, which we have adapted to the '500' series format of API*.

The MC624 is similar to the monitor section of a mixing desk: it lets you select one out of six stereo audio sources, adjust the level and route it to one of four monitor outputs.

The MP 512 is based on one discrete Op-Amp, one Cinemag input transformer and one Cinemag output transformer.

The AB528 is a transformers coupled, class A mic preamp. The design, from the late 60's, is inspired by a legendary console, that was used at the most famous London studio by the greatest artists, such as the Beatles or Pink Floyd.

The CP5176 is a FET compressor based on the design that was originally used in the 1176 compressor, which has been adapted to the '500' format of API*.

The REM624 is a remote control unit for the MC624 Monitor Controler.

It offers the same contols as the central unit (except headphones volume).

The TS500 is an analog processor that recreates the sonic imprint of vintage tape recorders. It provides the roundness, the punch, the compression and the saturation of magnetic tape.

The SK501 is a single slot, 500 series compatible case and power supply.

The CP554 is a transformer coupled diode bridge compressor based on the design of legendary British consoles, adapted to the 500 series format.

The XT500 is an extension cable which lets you connect a 500 series module to your lunchbox while keeping it outside for easy setting or maintenance.

The EQ573-II is an parametric equalizer based on the design that was originally used in the Neve 1073 and 1084 modules, that has been adapted to the '500' format of API*.

The DI503J is a triple mode Direct Box for instrument and a Re-Amp unit for the '500' format of API*.

True Grit is a tube saturation processor that allows for very soft and progressive saturation up to full overdrive.

The MU524 is a Variable Mu tube compressor which, with the help of two transformers, provides a smooth and vintage sounding soft knee compression.

The CP4500 is a Stereo bus compressor based on the design that was originally used in a legendary British console, adapted to the 500 series format of API*. It is famous for adding punch and glue to the mixes.

The EQ250 is a 5 bands stereo parametric equalizer inspired by the revered Sontec MEP-250A, adapted to the 500 series format.