Gorgeous, 3 Tube, Low Power Audio Amp for Guitar

[Enzo]

I think any tube with a grid cap or a plate cap lends visual appeal.

There is little use for it here, but the cute little 6H6 tubes are cool. The metal ones in particular. Dual diodes.

I have a couple metal tubes like 6SC7 or something that are bright red.

 

[Illinest]

http://www.thetubestore.com/Gas-Regulator-Tube-Glow-Photo-2

The OD3 has an interesting pink color