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Country |
Year |
Name |
1st Tube |
Notes |
USA |
40 |
275 |
6SK7 |
BC (540-1600 kHz), TROP (1550-4000 kHz) and SW (5.8-18.0 MHz) bands. Bandspread 9.34-9.86 ... |
USA |
40 |
276 |
6SK7 |
BC (540-1600 kHz), TROP (1550-4000 kHz) and SW (5.8-18.0 MHz) bands. Bandspread 9.34-9.86 ... |
USA |
40 |
277 |
6SK7 |
BC (540-1600 kHz), TROP (1550-4000 kHz) and SW (5.8-18.0 MHz) bands. Bandspread 9.34-9.86 ... |
USA |
40 |
280 |
6SK7 |
BC (540-1560 kHz), TROP (1400-4500 kHz) and SW (5.8-18.0 MHz) bands. BC band has 5 station... |
USA |
40 |
282 |
6SK7 |
BC (540-1560 kHz), TROP (1400-4500 kHz) and SW (5.8-18.0 MHz) bands. BC band has 5 station... |
USA |
40 |
284 |
6SK7 |
BC (540-1600 kHz), TROP (1600-4500 kHz) and SW (5.8-18.0 MHz) bands. 8 or 12 inch speaker. |
USA |
40 |
285 |
6SK7 |
BC (540-1560 kHz), TROP (1400-4500 kHz) and SW (5.8-18.0 MHz) bands. BC band has 5 station... |
USA |
40 |
285-1 |
6SK7 |
BC (540-1560 kHz), TROP (1400-4500 kHz) and SW (5.8-18.0 MHz) bands. BC band has 5 station... |
USA |
40 |
286 |
6SK7 |
BC (540-1600 kHz), TROP (1600-4500 kHz) and SW (5.8-18.0 MHz) bands. 8 or 12 inch speaker. |
USA |
42 |
288 |
6SK7GT |
BC (550-1600 kHz), SW1 (2.3-7.0 MHz) and SW2 (7.5-24.0 MHz) bands. Tuning eye. Push-pull a... |
USA |
42 |
288½ |
6SK7GT |
BC (550-1600 kHz), SW1 (2.3-7.0 MHz) and SW2 (7.5-24.0 MHz) bands. Tuning eye. Push-pull a... |
USA |
41 |
289 Duncan Phyfe Drum Table |
6SK7 |
BC (535-1650 kHz) and SW (5.5-18.5 MHz) bands. 6SK7 1st detector/mixer with 6SA7 as oscill... |