Transistor Noise Selection

TRANSISTOR NOISE SELECTION
TRANSISTOR NOISE SELECTION

FM ACOUSTICS' employs an exclusive listening test selection of low level transistors. Measuring instruments alone are not sensitive enough to distinguish whether a transistor's noise performance is truly perfect for audio applications.

Even if a transistor's noise level measures o.k. on test instruments - which is only a static/momentary measurement (!) - its noise may not be acceptable over a certain time period and its actual noise quality can negatively influence audio reproduction.



This is audible at lower levels. In a true State-of-the-Art unit this is unacceptable. FM ACOUSTICS has developed a proprietary and unique listening evaluation process which every single low- and line-level transistor must go through. Only after it has passed all three selection processes is the transistor allowed to be used - in perfectly matched pairs.

A tremendous amount of work goes into each unit manufactured: e.g., a single monophonic FM 334 crossover requires 120 (one hundred twenty) perfectly matched, noise-selected line level transistors!

This means, for example, that before a single FM 334 can be manufactured between 400 and 900 transistors (the actual quantity depends on the yield) must be selected and auditioned on specially-built testing machines.

The most costly part is not the rejected 400 to 800 transistors but all the lost time for the selection of those transistors that cannot be used!