This is an original 1970's API 525c compressor with the large-style meter, not easy to find! In my opinion, these older ones sound better than the new reissues. These older 525c's must be modified to fit in the modern API racks, and this one has the mod.
I've been using it in my Purple Sweet Ten rack and it works perfectly and sounds amazing. Very similar sound to an 1176 but a little weightier in sound, and it gives you the choice of compression or limiting and de-essing also. It was serviced by my tech Carl Farrugia about a year ago and is in 100% full working order.Two of the 2520 opamps are replacements and one is original. The input is unbalanced and the output is balanced.
From Attack Magazine: The 525. If youre looking for a flexible compressor which is versatile enough to work on anything then it probably shouldnt be on your shortlist. The 525s front panel layout gives a hint of the unorthodox approach on offer here. C (compression) and L (limiting) modes represent either 2:1 or 20:1 ratio respectively.Push button switches select one of four release times, which are then varied depending on the frequency range of the incoming signal. Likewise, attack time is determined automatically depending on the input. An input gain control stands in for a dedicated threshold setting, while a unique ceiling control adjusts both input gain and output gain simultaneously in order to increase or decrease the amount of compression while automatically compensating with make-up gain. If that wasnt enough, theres also a de-essing option.
Its not hugely intuitive: it demands work and time to achieve good results, but thats not to say the 525 isnt a lovely bit of kit. Favoured on guitars, vocals, drums and bass, it has a vaguely 1176. Esque sound, imparting obvious warmth and weight, with signals leaving it richer and thicker. It can also do great things on a parallel bus.In short; if characters what you need, shortlist the API. Although rarely chosen as a first compressor, alongside others in the rack it can bring a signature colour to the mix palette largely unavailable elsewhere. First introduced in the 1970s to fit the 500-series slots in APIs mixing consoles, the 525 is still only available in 500-series format, so bear in mind that youll also need a lunchbox. Or similar enclosure and power supply in order to use it. The item "Vintage 70's API 525C Compressor 500 Series NOT reissue serviced" is in sale since Friday, July 29, 2016. This item is in the category "Musical Instruments & Gear\Pro Audio Equipment\Preamps & Channel Strips". The seller is "faultliner" and is located in Los Angeles, California. This item can be shipped to United States, to Canada, to United Kingdom, DK, RO, SK, BG, CZ, FI, HU, LV, LT, MT, EE, to Australia, GR, PT, CY, SI, to Japan, to China, SE, KR, ID, to Taiwan, TH, to Belgium, to France, to Hong Kong, to Ireland, to Netherlands, PL, to Spain, to Italy, to Germany, to Austria, RU, IL, to Mexico, to New Zealand, SG, to Switzerland, NO, SA, UA, AE, QA, KW, BH, HR, MY.