Cool little machine!
I have one The Audio took a dive about a month ago.
Waiting for a Replacement Transistor from one of our fine forum members.
I used it all the time.
As Stated, Limited Discrimination but I don't use any anyways. Ha!
TR sections sorta SUCKS.
The VLF sections is another story!
I've found 14k gold ear rings backs down to 6" as a clean target.
I found a 1/8 gram nugget and it sang like a Banshee at 4 inches. Lodged in a bedrock crack.
Back in the Yonder Years, they were marketed as a lower end coin machine but Running at 15 Khz, they stand apart from the New Coin Machines .
The circuit is based on the Groundhog circuit with less controls.
It Rocks! You can fix the Lame Discrim by replacing the Switch with a 10K pot.
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