But to make that measurement you need an amplifier circuit designed for the thermocouple being used. Linear Technology LTC 1049 Low Power Zero-Drift Operational Amplifier with Internal Capacitors ...

It consists of a JFET based pre-amplifier ... blog post provides extremely detailed circuit analysis of every part of the design, starting from the power supply filter to remove mains “hum ...

This circuit layout produced low distortion, prompting Quad to promote the 303 as “the world’s first low-distortion transistor amplifier”. At the rear of the Quad 303 power amp are the ...