Amplifier Harry Mayne Model R

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Item Amplifier Harry Mayne Model R
Item code
Description Push Pull O/P wit AVC
Manufacturer Petty Geophysical
Circa 1940
Model
Donor Petty Collection
Location The University of Texas at Austin
Serial number
Taxonomy GSHP027

Vacuum Tube Amplifier This is probably the most sophisticated vacuum tube amplifier ever made for seismic use. It was invented by W. Harry Mayne about 1940 and was known far and wide as Harry's Model FII. It had push-pull output, double acting AVC, etc. and it did everything. Petty made tons of them. Then came horizontal stacking (CRP by Mayne) and the need for more and smaller amplifiers.