| Album links |
| Root |___ Tube Testing Service |___ Preamp |___|___ 12AT7_ECC81 |___|___|___ AMPEREX |___|___|___ GE |___|___|___ RCA |___|___|___ RFT |___|___|___ MULLARD |___|___|___ SIEMENS |___|___|___ SYLVANIA |___|___|___ TELEFUNKEN |___|___ 12AU7_ECC82 |___|___|___ KEN RAD |___|___|___ TELEFUNKEN |___|___|___ MAZDA_RTC |___|___|___ SYLVANIA |___|___|___ TUNG SOL |___|___ 12BH7 |___|___|___ RCA |___|___|___ GE |___|___ 5687_7119_6900 |___|___|___ GE |___|___|___ RAYTHEON |___|___|___ RCA |___|___|___ TUNG SOL |___|___|___ SYLVANIA |___|___ 5751 |___|___|___ EH |___|___|___ RCA |___|___|___ GE |___|___ 6922_E88CC |___|___|___ AMPEREX |___|___|___ EH |___|___|___ MULLARD |___|___|___ PHILIPS |___|___|___ SYLVANIA |___|___ 6EU7 |___|___|___ RCA |___|___ 6SL7_5691 |___|___|___ BRIMAR |___|___|___ SYLVANIA |___|___ 6SN7_5692 |___|___|___ SYLVANIA |___|___|___ TUNG SOL |___|___|___ RCA |___|___ 7308_E188CC |___|___|___ AMPEREX |___|___|___ MAZDA_RTC |___|___|___ SYLVANIA |___|___ 12AX7_ECC83_7025 |___|___|___ MULLARD |___|___|___ RCA |___|___|___ RTC |___|___|___ TUNG SOL |___|___|___ CBS |___|___|___ GE |___|___|___ MATSUSHITA |___|___|___ SOVTEK |___|___|___ SYLVANIA |___|___|___ AMPEREX |___|___|___ Ei |___|___|___ TELEFUNKEN |___|___ 6FQ7_6CG7 |___|___ 5879 |___|___|___ RCA |___|___ EF86_6267 |___|___|___ AMPEREX |___|___ 12BY7 |___|___|___ RCA |___|___|___ SYLVANIA |___|___ 6DJ8_ECC88 |___|___|___ AMPEREX |___ Power |___|___ 211_VT4C |___|___ 5693 |___|___ 396A_2C51 |___|___|___ WESTERN ELECTRIC |___|___ 56 |___|___ 6550_KT88 |___|___|___ GENALEX |___|___ 6CA7_EL34 |___|___|___ MULLARD |___|___ 6L6_KT66 |___|___|___ Philips |___|___ 71 |___|___ 75 |___ Rectifier |___|___ 5AR4_GZ34 |___|___|___ MAZDA |___|___|___ MULLARD |___|___|___ AMPEREX |___|___ 5U4_U52 |___|___|___ GE |___|___|___ RCA |___|___|___ RT MAZDA |___|___ 5R4 |___|___|___ CHATHAM |___|___|___ RCA |___|___ 5Y3 |___|___|___ MAZDA |___|___|___ RCA |___|___ 6X4 |___|___|___ BENDIX |___|___ 5V4_GZ32 |___ 6L6 Calibration Tube |___ Manuals & Date Codes |___ Parameters & Ephemera |___|___ 12AT7 |___|___ 12AU7 |___|___ 12AX7 |___|___ 12BH7 |___|___ 211 |___|___ 2A3 |___|___ 300B |___|___ 45 |___|___ 5687 |___|___ 5751 |___|___ 5AR4_GZ34 |___|___ 5R4 |___|___ 5Y3 |___|___ 5Z3 |___|___ 6900 |___|___ 6922_7308 |___|___ 6BQ5_EL84 |___|___ 6CA7_EL34 |___|___ 6EU7 |___|___ 6SJ7_5691 |___|___ 6SN7_5992 |___|___ 7062_E180CC |___|___ 7119 |___|___ 845 |___|___ KT66_6L6GC |___|___ KT88_6550 |___|___ KT90 |___|___ Manuals & Date Codes |___|___ U52 |___ Parameters and Ephemera |___|___ 12AT7 |___|___ 12AU7 |___|___ 12AX7 |___|___ 12BH7 |___|___ 211 |___|___ 2A3 |___|___ 300B |___|___ 45 |___|___ 5687 |___|___ 5751 |___|___ 5AR4_GZ34 |___|___ 5R4 |___|___ 5Y3 |___|___ 5Z3 |___|___ 6900 |___|___ 6922_7308 |___|___ 6BQ5_EL84 |___|___ 6CA7_EL34 |___|___ 6EU7 |___|___ 6SJ7_5691 |___|___ 6SN7_5992 |___|___ 7062_E180CC |___|___ 7119 |___|___ 845 |___|___ KT66_6L6GC |___|___ KT88_6550 |___|___ KT90 |___|___ Manuals and Date Codes |___|___ U52 |