SYMFET

this is a fully balanced, no compromise preamplifier, with true balanced signal path, without transfer of balanced signal to single-ended and back. Input devices are Toshiba JFETs, connected in a complementary-differential topology. Outputs are diamond buffers operating at high idle current.

the design

preamp circuit is placed inside a box milled from 8mm thick Al plates, designed especially to protect against interference electromagnetic fields. Power supply space is separated from preamp space by a thick Al barrier. Special care was dedicated to clean power supply design.

Pavel Macura - August 16, 2010; last modified August 16, 2010

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