With two pre-amps you can make a stereo preamp or ‘hybrid’ power amplifier. It is important to note that tubes are high voltage low current and from a conventional/modern circuit design ...

This amp design uses a plate voltage of 12, although the 12AU7 can handle up to about 330. Since the 12AU7 is of the Twin Triode variety, one tube can be used to amplify both a left and ...

Self-taught boutique builder Charles Henry puts musicality first with his designs, winning fans including Grace Bowers and ...

It utilized four EL34 output tubes, one GZ34/5AR4 rectifier ... have gone out of production). “The amp can be restored with its original design intact or, if one desires, it can be heavily ...