Magic Eye Tube 6e2 Em84 Vu Meter Audio Level Indicator Level Circuit Board Adjustable Sensitivity For Signal Amplifier Power - Instrument Parts & Accessories - AliExpress
6e2 Em84 Em87 Em800 Um84 Um87 6uh6 Magic Eye Vu Meter Audio Level Indicator Tube - Integrated Circuits - AliExpress
VU-meter with EM84 tube – AntiMath
Magic Eye Valve VU Meter, PCB Only, for EM87 / 6E2 - DSMCZ