13EM7/6EM7 - cool valve

AVForums

Help Support AVForums:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

El Sid

AVForums Super Veteran
*
AV Forums Supporter
Joined
May 26, 2016
Messages
1,992
Reaction score
452
Location
Jhb
I'm sure there are other valves that do the same thing, but I came across the 13EM7 twin triode, and thought it is pretty cool (6EM7 is the same thing with 6V heaters). It was originally intended for use as a vertical deflection oscillator and amplifier in TVs. The first section is a high-mu amplifier (μ=65), and the second low mu (5.5) but with 10W max plate dissipation. This makes it ideal for use as a one-valve amp - see the Miniblok and 6EM7 SET Vertical Amplifier. Circuit diagrams below. Has anyone used this valve? And would this be suitable for a headphone amp, not needing an OPT?

miniblok.gif


6EM7-SET-Amplifier-Schematic.png
 
Top