old amplifier |
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| navigate by keyword : amp amplifier analog anode audio black board bright capacitors case cathode circuit component connectors control current design device diode electrical electron electronic electronics filament glass glowing history instrument lamp light macro music obsolete old power radio resistor retro science socket sound technology transformer triode tube tubes vacuum valve vintage voltage |
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| part of an old amplifier in which two metallic blue capacitors stand out in front of some valves |
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