Grid Dip Meter of Unknown Origin

GDM-01-sm.jpg
GDM-01-sm.jpg GDM-01-sm.jpg
GDM-01-sm.jpg GDM-01-sm.jpg

The triode electron tube has been removed in this photograph:
GDM-01-sm.jpg
GDM-01-sm.jpg

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Similar Schematic

This is not the correct schematic but is similar to the unknown unit.. The unit is missing the coils and the power supply.

g30-page-30.jpg

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References

W4SZG Homebrewed Grip Dip Meter:
http://radioheaven.homestead.com/W4SZG-GridDipMeter.html

http://www.r-type.org/exhib/acl0092.htm

https://en.wikipedia.org/wiki/Acorn_tube

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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20210302 - pre published v0.9