Amazon.com: P‑78WTC VU Meter, Power Amplifier DB Meter, Sound Audio Level Tester, High Accurancy for DIY, Home Audio, Car Audio Conversion : Electronics
IN13 stereo plasma audio VU-meter demo2 - in the dark - YouTube
Absolutely cool plasma VU-meter: IT WORKS!!!! /Pictures/ | GroupDIY Audio Forum
VU meter - Wikipedia
Audio Vu meter with IN13 or IN9 Russian nixie bargraph tubes