tube valve radio amplifier preamplifier |
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| navigate by keyword : 12au7 12ax7 amp amplifier analog ancient anode audio background black board bright capacitors case cathode circuit closeup component connect connectors control current design device electrical electron electronic equipment filament glass glowing high history instrument lamp light macro music obsolete old power preamplifier radio resistors retro science socket sound supply surrounding technology triode tube tubes type using vacuum valve vintage voltage white with |
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| Tube radio amplifier, preamplifier using 12AX7 and 12AU7 9-pins type close-up of tubes connect on circuit board on white socket surrounding with high voltage capacitors and resistors, white background |
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