https://classiccurrents.com/products/1-tested-ken-rad-12sf5-tube-with-original-box-date-code-743-triode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_4864.jpg?v=1784671400 (1) Tested Ken Rad 12SF5 Tube with Original Box Code 743 Triode Vacuum Tube https://classiccurrents.com/products/1-tested-zenith-6dt6a-tube-with-box-date-code-918-6dt6-a-pentode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_4878.jpg?v=1784671766 (1) Tested Zenith 6DT6A Tube with Box Code 918 6DT6 A Pentode Vacuum Tube https://classiccurrents.com/products/1-tested-philco-starlight-12d4-tube-with-box-date-code-dbw-rectifier-tube-b 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_4904.jpg?v=1784671883 (1) Tested Philco Starlight 12D4 Tube with Box Date Code DBW Rectifier Tube (b) https://classiccurrents.com/products/1-tested-rca-6cy5-tube-with-box-date-code-gp-sharp-cutoff-tetrode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_4916.jpg?v=1784672063 (1) Tested RCA 6CY5 Tube with Box Code CP Sharp Cutoff Tetrode Vacuum Tube https://classiccurrents.com/products/1-tested-philco-25ax4gt-tube-and-box-date-code-56-26-25ax4-gt-vacuum-tube-b 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_4929.jpg?v=1784672170 (1) Tested Philco 25AX4GT Tube and Box Code 56-26 25AX4 GT Vacuum Tube (b) https://classiccurrents.com/products/1-tested-rca-6cs7-tube-and-box-date-code-cf-rca-double-triode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_4941.jpg?v=1784672322 (1) Tested RCA 6CS7 Tube and Box Date Code CF RCA Double Triode Vacuum Tube https://classiccurrents.com/products/tested-matched-pair-national-union-7a8-tubes-and-boxes-codes-lu-octode-converter 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_4962.jpg?v=1784749424 Tested Matched Pair National Union 7A8 Tubes and Boxes Codes LU Loctal Tubes (a) https://classiccurrents.com/products/1-tested-raytheon-6as5-tube-with-box-made-in-taiwan-date-code-e14-pentode-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_4979.jpg?v=1784751721 (1) Tested Raytheon 6AS5 Tube with Box Made in Taiwan Date Code E14 Pentode Tube https://classiccurrents.com/products/1-tested-ge-12v6gt-tube-with-box-code-fi-general-electric-beam-power-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5026.jpg?v=1784753763 (1) Tested GE 12V6GT Tube with Box Code FI General Electric Beam Power Tube https://classiccurrents.com/products/1-tested-rca-6bf5-tube-with-box-date-code-mt-pentode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5021.jpg?v=1784753958 (1) Tested RCA 6BF5 Tube with Box Date Code MT Pentode Vacuum Tube https://classiccurrents.com/products/1-tested-sylvania-5y3gt-tube-red-letters-with-box-fe-ddf-full-wave-rectifier 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5015.jpg?v=1784754233 (1) Tested Sylvania 5Y3GT Tube Red Letters & Box fe DDF Full Wave Rectifier https://classiccurrents.com/products/1-tested-strong-ge-6cm6-tube-with-box-date-code-jf-power-amplifier-tetrode-b 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5006.jpg?v=1784756671 (1) Tested Strong GE 6CM6 Tube with Box Code JF Power Amplifier Tetrode (b) https://classiccurrents.com/products/1-tested-rca-32l7gt-tube-with-box-black-glass-date-code-643-32l7-gt-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_4998.jpg?v=1784757097 (1) Tested RCA 32L7GT Tube with Box Black Glass Date Code 643 32L7 GT Tube https://classiccurrents.com/products/1-tested-zenith-6z10-6j10-tube-with-box-date-code-822-power-pentode-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_4992.jpg?v=1784757416 (1) Tested Zenith 6Z10 6J10 Tube with Box Code 822 Pentode 6Z10 Tube https://classiccurrents.com/products/1-tested-rca-6hr6-tube-with-box-date-code-aj-semi-remote-cutoff-pentode-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_4985.jpg?v=1784757771 (1) Tested RCA 6HR6 Tube with Box Code AJ Semi Remote Cutoff Pentode Tube https://classiccurrents.com/products/1-tested-national-union-7a8-tube-with-box-date-code-lu-loctal-octode-converter 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_4970.jpg?v=1784758153 (1) Tested National Union 7A8 Tube with Box Code LU Loctal Octode Converter (b) https://classiccurrents.com/products/1-tested-sylvania-6z10-6j10-tube-with-box-power-pentode-vacuum-6z10-tube-a 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5054.jpg?v=1784842399 (1) Tested Sylvania 6Z10 6J10 Tube with Box Power Pentode 6Z10 Tube (a) https://classiccurrents.com/products/1-tested-sylvania-6af4a-tube-red-letters-with-box-code-lb-avv-triode-6af4-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5068.jpg?v=1784842692 (1) Tested Sylvania 6AF4A Tube Red Letters with Box Code lb AVV Triode 6AF4 https://classiccurrents.com/products/1-tested-national-union-7q7-tube-with-box-code-jc-pentagrid-converter-loctal 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5089.jpg?v=1784843438 (1) Tested National Union 7Q7 Tube with Box Code JC Pentagrid Converter Loctal https://classiccurrents.com/products/1-tested-strong-sylvania-6bz6-tube-red-letters-with-box-code-ec-abz-pentode 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5084.jpg?v=1784844099 (1) Tested Sylvania 6BZ6 Tube Red Letters with Box Code ec ABZ Pentode https://classiccurrents.com/products/1-tested-tung-sol-12sa7gt-tube-with-box-date-code-113-12sa7-gt-converter-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5078.jpg?v=1784845169 (1) Tested Tung Sol 12SA7GT Tube with Box Code 113 12SA7 GT Converter Tube https://classiccurrents.com/products/1-tested-rca-6cu5-with-box-date-code-cb-black-plate-beam-power-pentode-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5073.jpg?v=1784845819 (1) Tested RCA 6CU5 with Box Code CB Black Plate Beam Power Pentode Tube https://classiccurrents.com/products/1-tested-sylvania-6z10-6j10-tube-with-box-code-lf-aao-pentode-6z10-tube-b 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5061.jpg?v=1784846478 (1) Tested Sylvania 6Z10 6J10 Tube & Box Code lf AAO Pentode 6Z10 Tube (b) https://classiccurrents.com/products/1-tested-1955-magnavox-6ax4gt-tube-date-code-513-6ax4-gt-rectifier-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/s-l1600-1.webp?v=1785905253 (1) Tested Magnavox 6AX4GT Tube Date Code 513 6AX4 GT Rectifier Vacuum Tube https://classiccurrents.com/products/1-tested-1963-ge-usn-5y3wgtb-tube-code-63-26-mil-spec-rectifier-5y3gt-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5233.jpg?v=1786995328 (1) Tested GE USN 5Y3WGTB Tube Code 63-26 Mil Spec Rectifier 5Y3GT Tube https://classiccurrents.com/products/1-tested-1962-zenith-6ds4-tube-with-box-nuvistor-tube-code-218-sylvania-eia 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5237.jpg?v=1786996218 (1) Tested Zenith 6DS4 Tube with Box Nuvistor Tube Code 218 Sylvania EIA https://classiccurrents.com/products/1-tested-1963-micro-6ax4gt-tube-code-10-63-6ax4-gt-half-wave-rectifier-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5247.jpg?v=1786996639 (1) Tested Micro 6AX4GT Tube Code 10-63 6AX4 GT Half Wave Rectifier Tube https://classiccurrents.com/products/1-tested-1969-rca-6ez8-tube-with-box-date-code-cm-triple-triode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5252.jpg?v=1786996961 (1) Tested RCA 6EZ8 Tube with Box Date Code Cm Triple Triode Vacuum Tube https://classiccurrents.com/products/1-tested-itt-6hz8-tube-with-box-code-h09-high-mu-triode-pentode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5257.jpg?v=1786997244 (1) Tested ITT 6HZ8 Tube with Box Code H09 High Mu Triode Pentode Vacuum Tube https://classiccurrents.com/products/1-tested-1949-sylvania-jan-chs-7c7-tube-code-9-13-mil-spec-loktal-tube-loctal 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5264.jpg?v=1786997695 (1) Tested Sylvania JAN CHS 7C7 Tube Code 9-13 Mil Spec Loktal Tube Loctal https://classiccurrents.com/products/1-tested-strong-philco-12l6gt-tube-code-aad-12l6-gt-beam-power-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5268.jpg?v=1786998434 (1) Tested Strong Philco 12L6GT Tube Code AAD 12L6 GT Beam Power Vacuum Tube https://classiccurrents.com/products/1-tested-1957-sylvania-5cl8a-tube-with-box-code-dc-age-triode-tetrode-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5271.jpg?v=1786999393 (1) Tested Sylvania 5CL8A Tube with Box Code dc AGE Triode Tetrode Tube https://classiccurrents.com/products/1-tested-very-strong-national-union-39-44-tube-with-box-code-gn-pentode-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5277.jpg?v=1786999692 (1) Tested Very Strong National Union 39/44 Tube with Box Code GN Pentode Tube https://classiccurrents.com/products/1-tested-raytheon-6hs8-tube-with-box-japan-code-6d-sharp-cutoff-twin-pentode 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5285.jpg?v=1786999938 (1) Tested Raytheon 6HS8 Tube with Box Japan Code 6D Sharp Cutoff Twin Pentode https://classiccurrents.com/products/1-tested-1971-sylvania-6cd6ga-tube-with-box-code-fh-all-6cd6-ga-power-pentode 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5294.jpg?v=1787076180 (1) Tested Sylvania 6CD6GA Tube with Box Code fh ALL 6CD6 GA Power Pentode https://classiccurrents.com/products/1-tested-strong-1968-rca-6as5-tube-with-box-code-ca-6as5-pentode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5300.jpg?v=1787076431 (1) Tested Strong RCA 6AS5 Tube with Box Code CA 6AS5 Pentode Vacuum Tube https://classiccurrents.com/products/1-tested-national-union-6sf5gt-tube-with-box-code-ku-6sf5-triode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5306.jpg?v=1787076625 (1) Tested National Union 6SF5GT Tube with Box Code KU 6SF5 Triode Vacuum Tube https://classiccurrents.com/products/1-tested-1969-zenith-6fh5-tube-with-box-date-code-69-52-triode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5313.jpg?v=1787076989 (1) Tested Zenith 6FH5 Tube with Box Date Code 69-52 Triode Vacuum tube https://classiccurrents.com/products/1-tested-1961-dumont-emerson-1g3gt-tube-code-61-35-half-wave-rectifier-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5319.jpg?v=1787077354 (1) Tested Dumont Emerson 1G3GT Tube Code 61-35 Half Wave Rectifier Tube https://classiccurrents.com/products/1-tested-very-strong-raytheon-6gn8-tube-japan-with-box-code-p10-triode-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5322.jpg?v=1787077475 (1) Tested Very Strong Raytheon 6GN8 Tube Japan with Box Code P10 Triode Tube https://classiccurrents.com/products/1-tested-1947-ken-rad-7a4-tube-with-original-box-date-code-730-loctal-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5331.jpg?v=1787077963 (1) Tested Ken Rad 7A4 Tube with Original Box Date Code 730 Loctal Tube https://classiccurrents.com/products/1-tested-1964-sylvania-6bz6-tube-with-box-date-code-lc-bdo-pentode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5339.jpg?v=1787078272 (1) Tested Sylvania 6BZ6 Tube with Box Date Code lc BDO Pentode Vacuum Tube https://classiccurrents.com/products/1-tested-1977-rca-6cl3-6ck3-tube-and-box-code-ga-half-wave-rectifier-6cl3-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5347.jpg?v=1787078573 (1) Tested RCA 6CL3 6CK3 Tube and Box Code GA Half Wave Rectifier 6CL3 Tube https://classiccurrents.com/products/1-tested-1964-rca-6dx8-ecl84-tube-and-box-holland-code-aa-etched-2f4-code 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5352_ae30da66-d75c-43fd-9335-65682f71f2bb.jpg?v=1787078923 (1) Tested RCA 6DX8 ECL84 Tube and Box Holland Code AA Etched ◢2F4 Code https://classiccurrents.com/products/1-tested-1944-philco-7a5e-tube-with-box-code-o4-7a5-tube-loctal-tube-loktal 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5358.jpg?v=1787079240 (1) Tested Philco 7A5E Tube with Box Code O4 7A5 Tube Loctal Tube Loktal https://classiccurrents.com/products/1-tested-raytheon-6aw8a-tube-japan-with-box-code-j-14-6aw8-a-triode-pentode 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5368.jpg?v=1787079511 (1) Tested Raytheon 6AW8A Tube Japan with Box Code J-14 6AW8 A Triode Pentode https://classiccurrents.com/products/1-tested-1963-westinghouse-2e26-tube-code-63-31-beam-tetrode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5395.jpg?v=1787168444 (1) Tested Westinghouse 2E26 Tube Code 63-31 Beam Tetrode Vacuum Tube https://classiccurrents.com/products/1-tested-1972-sylvania-6de6-tube-with-box-date-code-gc-ran-pentode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5400.jpg?v=1787168656 (1) Tested Sylvania 6DE6 Tube with Box Date Code gc RAN Pentode Vacuum Tube https://classiccurrents.com/products/1-tested-national-union-35z3-tube-with-box-code-lr-rectifier-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5406.jpg?v=1787168963 (1) Tested National Union 35Z3 Tube with Box Code LR Rectifier Vacuum Tube https://classiccurrents.com/products/1-tested-1963-rca-6hl8-tube-with-box-date-code-nh-triode-pentode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5414.jpg?v=1787169245 (1) Tested RCA 6HL8 Tube with Box Date Code NH Triode Pentode Vacuum Tube https://classiccurrents.com/products/1-tested-1965-rca-6de4-tube-date-code-am-6de4-half-wave-rectifier-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5450.jpg?v=1787169444 (1) Tested RCA 6DE4 Tube Code AM 6DE4 Half Wave Rectifier Vacuum Tube https://classiccurrents.com/products/1-tested-1963-zenith-6cg8a-tube-with-box-code-3-39-6cg8-a-tube-triode-pentode 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5425.jpg?v=1787169894 (1) Tested Zenith 6CG8A Tube with Box Code 3-39 6CG8 A Tube Triode Pentode https://classiccurrents.com/products/1-tested-strong-1962-chief-5v6gt-tube-code-8-62-5v6-gt-beam-power-output-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5431.jpg?v=1787170111 (1) Tested Strong Chief 5V6GT Tube Code 8-62 5V6 GT Beam Power Output Tube https://classiccurrents.com/products/1-tested-raytheon-6jh6-tube-with-box-semi-remote-cutoff-pentode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5435.jpg?v=1787170309 (1) Tested Raytheon 6JH6 Tube with Box Semi Remote Cutoff Pentode Vacuum Tube https://classiccurrents.com/products/1-tested-1962-philco-6ac7-tube-date-code-6217-sharp-cutoff-pentode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5441.jpg?v=1787170510 (1) Tested Philco 6AC7 Tube Date Code 6217 Sharp Cutoff Pentode Vacuum Tube https://classiccurrents.com/products/1-tested-1969-sylvania-6by8-tube-with-box-date-code-de-ejv-diode-pentode-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5445.jpg?v=1787170765 (1) Tested Sylvania 6BY8 Tube with Box Date Code de EJV Diode Pentode Tube https://classiccurrents.com/products/1-tested-zenith-6cb6a-tube-red-letters-with-box-code-abn-pentode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5461.jpg?v=1787255858 (1) Tested Zenith 6CB6A Tube Red Letters with Box Code ABN Pentode Vacuum Tube https://classiccurrents.com/products/1-tested-1962-rca-6sk7-tube-code-mx-remote-cutoff-pentode-metal-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5467.jpg?v=1787256068 (1) Tested RCA 6SK7 Tube Code MX Remote Cutoff Pentode Metal Vacuum Tube https://classiccurrents.com/products/1-tested-1969-zenith-6es5-tube-with-box-date-code-9-52-triode-vacuum-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5471.jpg?v=1787256285 (1) Tested Zenith 6ES5 Tube with Box Date Code 9-52 Triode Vacuum Tube https://classiccurrents.com/products/1-tested-1948-cunningham-50l6gt-tube-code-852-50l6-gt-power-amplifier-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5482.jpg?v=1787256611 (1) Tested Cunningham 50L6GT Tube Code 852 50L6 GT Power Amplifier Tube https://classiccurrents.com/products/1-tested-1969-sylvania-6ab4-tube-with-box-code-de-jfj-high-mu-triode-tube 2026-09-11T09:06:29-04:00 daily https://cdn.shopify.com/s/files/1/0788/5999/3343/files/IMG_5486.jpg?v=1787256848 (1) Tested Sylvania 6AB4 Tube with Box Code de JFJ High Mu Triode Tube https://classiccurrents.com/products/1-tested-1955-rca-6l7-tube-date-code-nhk-rca-pentagrid-mixer-vacuum-tube 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