JJ Electronics ECC81 / 12AT7 medium gain pre-amplifying double triode. Can be also used as replacement for 12AX7 in many applications. Very smooth and warm sound. Very low microphonic. Good for phase inverters or reverb drivers.The relatively young company JJ Electronics launched
in 1994 with former Tesla equipment. Meanwhile, enjoy these tubes a very good reputation and are often used in repair and maintenance work used.Made In Slovak Republic.