The circuit employs a mere three tubes — one 12AX7 preamp, one 6V6GT output and one 5Y3 rectifier — each of which performs an entirely different job.

To investigate this method, a commercially available MEMS piezoelectric microphone, the Vesper VM1000, and two types of second stage amplifiers, using either an OPA344 or a LMH6629 based amplifier ...

In almost every case—except for the Copland, which broke far too often to justify keeping, and the Emotive Audio Sira, which ...

This paper presents the design and realization of a gain-programmable microphone audio preamplifier that does not need external input-decoupling capacitors. Three possible preamplifier implementations ...

Wanda is a high-quality and great-sounding compact, stand-mounted condenser mic with a distinctive and rugged-cast all-brass ...