This lovely little number is the EF80 pentode thermionic valve, or vacuum tube, made by Mullard beginning in 1950. They were used in radio and radar applications, but most of them wound up in ...

To avoid AC line hum, the radio is battery operated and while the original uses an EL95 tube, [Mirko] used an EF80. To get the necessary stability, it is important that everything is secured.

US stocks (^DJI, ^IXIC, ^GSPC) see another day of red as the S&P 500 falls by nearly 1.6% and the Nasdaq Composite sinks by less than 2.8% in Thursday's session. This all comes as Nvidia stock ...