Robuta

https://artaudio.co.uk/the-diavolo-mk2-t-single-ended-triode/

THE DIAVOLO MK2-T SINGLE ENDED TRIODE

single ended diavolo triode

https://www.adafruit.com/product/6140

Single-Ended Flexible LED Filament - 3V 25mm long - Red : Adafruit Industries, Unique & fun DIY...

Adafruit Industries, Unique & fun DIY electronics and kits : -

single ended led filament long red flexible adafruit