Hi, I have for sale 2 tested tubes GU78B + a new socket with chimney. The tube is good for 4KW on HF, 6m and 2m. More info you will find here: http://www.tubes.ru/techinfo/AmateurRadio/gu-78b.html The price is 250 Euro per tube and 150 Euro for the socket + chimney, shipping is extra. vy 73 Oliver, DL1EJA