ECF82 / 6U8 / CV5065 / 6KD8
The ECF82 (also including the entire ECF802 and 803 family) valve is composed of two different valves in the same glass envelope, namely a TRIODE and a PENTODE. It was designed by Mullard as a frequency converter for use in both civilian, amateur and military radio broadcasting equipment. It is part of the noval valve family and has very interesting electrical characteristics, as well as being low noise for this reason, in its history and even today it is very interesting for AUDIO and DIY project applications.
EQUIVALENT: 6U8 = CV5065 = 6KD8 = 6AX8 & SUBSTITUTE: 6687 = 7731