Thoro-Test/Midland Series GDOs


 


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Midland Tr. Grid-Dip Meter Model 23-120 Transistorized dip meter with a 0.5 to 150 MHz range, using 6 plug-in coils. Identical to the THORO-TEST GDM-3. Made in Japan

 

         

The Monarch GDM-1 is another version of the "Midland Tr". Both obviously made by the same manufacturer.

The Quemont Electronics GDM-3 transistorized dip meter with a range of 0.5 to 150 MHz, using 6 plug-in coils. The unit is identical to the Midland /Thoro-Test Series

The Tech model TE-15 is a later model of the Midland/THORO-TEST series of GDOs. It features a three transistor circuit over the one transistor of the original series. Looks practically identical. Click for large picture.      

 

 

 

 

THORO-TEST GDM-3 Ttransistorized dip meter with a range of 0.5 to 150 MHz, using 6 plug-in coils. Identical to the Midland... or perhaps the Midland is identical to it!  Made in Japan, before MC became MHz.

 

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