U-Tech 681

U-Tech 681
Curve tracer plug-in U-Tech 681 Compatible with 560-series scopes Produced from (?) to (?) Manuals U-Tech 681, 682, and 683 Manual with Patent and Bio (Manuals are OCRed PDF files unless noted otherwise)

The U-Tech 681 is a transistor/diode curve tracer plug-in for 560-series scopes, introduced around 1968.

Sister model U-Tech 682 is the same for 500-series scopes, and there was a standalone model 683.

Key Specifications

Year	Catalog price	In 2026 dollars
1969	$595	~$5,300