Overdriving Vacuum Tubes And Releasing The Magic Light Within | Hackaday
Black Plate Tubes - Effectrode
Tube noob here. Is this EL84 red plating? I had no sound earlier, pulled the tube and reseated it. It started working again, but I noticed the tube was pretty bright orange.
Desert Amplifier Repair - Red Plating - a sign your tubes are not matched or you bias is too hot and your tubes are prematurely dying. Left uncorrected the tube failure could
Red plating question : r/ToobAmps
Tube-Town GmbH – Tube FAQ
Filament Glow and Red-Plating in Vacuum Tubes
Output valves/tubes red-plating in the LC30-ii | Red plates, Edison light bulbs, Plating