![]() ![]() In turn, the panel becomes more or less bright and the resistance of both photoresistors changes accordingly. As the incoming signal level changes so does the voltage of the side-chain control signal. The side-chain control signal of this ‘leveling amplifier’ (a term derived from its original intended application in broadcast) is drawn from the input signal, and feeds a T4 ‘opto’ cell, which comprises an electro-luminescent panel attached to a pair of photoresistors, all sealed from external light. The presence of a number of valves and input/output transformers does, of course, contribute to the sonic character, but the beating heart of the LA-2A design is its optical gain-reduction circuitry. I’ll then discuss how faithful a recreation Warm have managed to make, and what, if any, corners they’ve had to cut along the way. First, let’s consider what has earned the LA-2A it’s enviable reputation. Once again, the idea is to produce an authentic but affordable recreation this time, we have a remake of the Teletronix LA-2A, which is another of those characterful yet versatile processors that have proven enduringly popular. The WA-2A isn’t Warm Audio’s first homage to a Universal Audio compressor - we reviewed the FET-based WA76, a Rev D 1176 clone, back in SOS May 2014 ( ). Warm Audio promise us an authentic recreation of the Teletronix LA-2A for a fraction of the price. ![]()
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