I have been listening to these Tung Sol 6L6G tubes in my TU-879 the last couple of days. According to New Sensor, while these are G tubes, they have an uprated plate dissipation of 30W, so they are effectively a 6L6GC. The vintage-style bottle looks like a big power triode. They sound very similar to the EH 6L6GC as far as I can tell, and look very cool on the Elekit TU-879S amplifier.
The Tung Sol 6L6G is available from most of the online tube vendors.
