1619 / VT164 / CV723 Pentodo NOS. Laboratorio Musicale
1619 JAN RCA NOS VALVE TUBE | eBay
1619 RCA Audio Vacuum Tube Valve - Bangybang
Morrison Bros. Model 1619 Mechanical Vertical Tank Top Gauge w/ Drop Tube Float & Level Alarm Relay - Up to 50 ft. - Feet & Inches - John M. Ellsworth Co. Inc.