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> Grass P511 high performance ac preamplifier - polygraph
Grass P511 high performance ac preamplifier - polygraph
GRASS P511 High Performance AC Preamplifier - Polygraph
GRASS P511 High Performance AC Preamplifier
Manual included with instructions and circuit line drawings
This was used as a polygraph machine but the Grass P511's are merely a signal amplification of the finest caliber and can be used for many uses be it amplification of sound, piezo electric input, study metal dielectric properties or ferro induced magnetism . These are 4 identicle P511's rackmounted into a stainless cabinet. The lower module is the Grass Regulated Power Supply with a slow-blow fuse, model RPS-106-B
