A look at the Potomac AA-51 Audio Analyzer: schematic, calibration procedures, service manual and more inside. Produced in the 1980’s, the AA-51 is still of great use.
This is the new method I am using to not only ensure the quality of solder joints, but also verifying vintage items that are not easily read or seen. Especially with vintage tubes. Transparent materials give this the ability to literally pierce down deeper. This no-name brand standalone/portable microscope with a 6-8 hr battery comes in […]