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An electronic amplifier is a device for increasing the current, voltage or power of a signal. It does this by taking power from a power supply and controlling the output to match the input signal shape but with a larger amplitude. more...

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Adcom Gfa-535L Stereo Power Amplifier Excellent Made In UsaAdcom Gfa-535L Stereo Power Amplifier Excellent Made In Usa $199.99 Adcom Gfp-565 PreamplifierAdcom Gfp-565 Preamplifier $449.00
Adcom Gfa-5300, Stereo/Surround 2 Channel Power Amplifier, Tested & Working.Adcom Gfa-5300, Stereo/Surround 2 Channel Power Amplifier, Tested & Working. $179.99 Adcom Gfa-5300 2 Channel Power AmplifierAdcom Gfa-5300 2 Channel Power Amplifier $218.50
Adcom Gfa-545 Ii High Current Stereo Power Amplifier - TestedAdcom Gfa-545 Ii High Current Stereo Power Amplifier - Tested $299.99 Adcom Gfa-7300 5 Channel Amplifier Tested!Adcom Gfa-7300 5 Channel Amplifier Tested! $299.99
Adcom amplifier Gfa 555Adcom amplifier Gfa 555 $499.00 Adcom Gfa-2535 Stereo Power Amplifier 4 ChannelAdcom Gfa-2535 Stereo Power Amplifier 4 Channel $250.00
Adcom Model Gfa 2535 4 Channel 240 320W Stereo Power Amplifier Amp W/Box TestedAdcom Model Gfa 2535 4 Channel 240 320W Stereo Power Amplifier Amp W/Box Tested $399.99 Adcom Gfa-565 Monoblock A/B Power AmplifierAdcom Gfa-565 Monoblock A/B Power Amplifier $349.00
Vintage Adcom Gfa-535 2 Channel Power Amplifier Stereo High Current ReadVintage Adcom Gfa-535 2 Channel Power Amplifier Stereo High Current Read $119.00 Adcom Gfa-545 Ii 600W 2-Channel Power Amplifier Good Working ConditionAdcom Gfa-545 Ii 600W 2-Channel Power Amplifier Good Working Condition $729.99
Adcom Gfa-545 power amplifier (2-ch/100wpc) Made in JapanAdcom Gfa-545 power amplifier (2-ch/100wpc) Made in Japan $284.99 Adcom Gfa-5002 Stereo Power Amplifier • 50Wpc • Exc Cond • Smoke Free HomeAdcom Gfa-5002 Stereo Power Amplifier • 50Wpc • Exc Cond • Smoke Free Home $199.99
Adcom Gfa-555 Stereo Power Amplifier & Gfp-555 PreamplifierAdcom Gfa-555 Stereo Power Amplifier & Gfp-555 Preamplifier $310.00 Adcom Gfa 5002 Power Amplifier 50Wpc Tested WorkingAdcom Gfa 5002 Power Amplifier 50Wpc Tested Working $124.98
New ListingAdcom Gfa-5300 Power Amplifier – Clean, Reliable PowerNew ListingAdcom Gfa-5300 Power Amplifier – Clean, Reliable Power $395.00 Adcom Gfa7707 Multi-Channel Power Amplifier 200W per channelAdcom Gfa7707 Multi-Channel Power Amplifier 200W per channel $2,250.00
New! 2025 Adcom Gfa-555Se Audiophile Edition Stereo Amplifier $1699New! 2025 Adcom Gfa-555Se Audiophile Edition Stereo Amplifier $1699 $1,699.00 Adcom Gfa 5002 Power Amplifier tested and workingAdcom Gfa 5002 Power Amplifier tested and working $149.99
Rack Mount Adcom Gfa-6002 2-Channel Stereo Power AmplifierRack Mount Adcom Gfa-6002 2-Channel Stereo Power Amplifier $249.99 Adcom Gfa-1A Power Amplifier - 200 wpc 8 ohms / 350 wpc 4 ohmsAdcom Gfa-1A Power Amplifier - 200 wpc 8 ohms / 350 wpc 4 ohms $219.99
New ListingAdcom Gfa-555 Channel Power AmplifierNew ListingAdcom Gfa-555 Channel Power Amplifier $280.00 Adcom Gfa 7807 Power Amplifier BeastAdcom Gfa 7807 Power Amplifier Beast $2,250.00
Adcom Gfa-5400 High Current Power Amplifier - 200 Watt / Ch (4 Ohms)Adcom Gfa-5400 High Current Power Amplifier - 200 Watt / Ch (4 Ohms) $250.00 Adcom Gfa-555ii 2-Channel Stereo Power Amplifier - 200 Wpc - Cleaned - TestedAdcom Gfa-555ii 2-Channel Stereo Power Amplifier - 200 Wpc - Cleaned - Tested $999.95
Adcom Amp Gfa-5400 Power Stereo Amplifier WorkingAdcom Amp Gfa-5400 Power Stereo Amplifier Working $149.00 Adcom Gfa 555 Power Amp and Gfp 555 Preamp ampAdcom Gfa 555 Power Amp and Gfp 555 Preamp amp $500.00
Adcom Gfa-535 High Current Stereo Power Amplifier - Fair ConditionAdcom Gfa-535 High Current Stereo Power Amplifier - Fair Condition $199.99 1986 Adcom Gfp 555 Preamplifier Tested Working Made In Usa1986 Adcom Gfp 555 Preamplifier Tested Working Made In Usa $299.99
Adcom Gfa-555 Ii Power Amplifier Stereo/Mono InputAdcom Gfa-555 Ii Power Amplifier Stereo/Mono Input $720.00 Adcom Gfa-5400 Stereo Power AmplifierAdcom Gfa-5400 Stereo Power Amplifier $192.50
Adcom Gfa-535 Ii Power AmplifierAdcom Gfa-535 Ii Power Amplifier $200.00 Adcom Gfa-555 Stereo Power Amplifier, Professional Cleaned, Serviced And Tested.Adcom Gfa-555 Stereo Power Amplifier, Professional Cleaned, Serviced And Tested. $329.00
Adcom Gfa 5500 Stereo Amplifier -HAdcom Gfa 5500 Stereo Amplifier -H $475.00 Adcom Gfa-1A Power Amplifier- Bench Checked, Cleaned, Lubed, Fully TestedAdcom Gfa-1A Power Amplifier- Bench Checked, Cleaned, Lubed, Fully Tested $289.99
Us Adcom Gfa-2535 Power AmplifierUs Adcom Gfa-2535 Power Amplifier $714.24 Adcom Gfa-555ms Bridgeable High Current Stereo Power AmpAdcom Gfa-555ms Bridgeable High Current Stereo Power Amp $1,250.00
Vintage Adcom Gfp 555 Ii Preamplifier Amplifier W/Power Cord Powers OnVintage Adcom Gfp 555 Ii Preamplifier Amplifier W/Power Cord Powers On $149.99 Adcom Gfa 7607 7 channel amplifier175 watts per channel @ 4 ohms ,Tested RareAdcom Gfa 7607 7 channel amplifier175 watts per channel @ 4 ohms ,Tested Rare $699.00
Adcom Gfa-555ii 2-Channel Stereo Power Amplifier - Serviced - Cleaned - TestedAdcom Gfa-555ii 2-Channel Stereo Power Amplifier - Serviced - Cleaned - Tested $899.95 Adcom Gfa-535 Ii Stereo Power Amplifier, 60W Per ChannelAdcom Gfa-535 Ii Stereo Power Amplifier, 60W Per Channel $224.50
Adcom Gfa-545 Ii 2 Channel Power Amplifier 100 Wpc perfect working conditionAdcom Gfa-545 Ii 2 Channel Power Amplifier 100 Wpc perfect working condition $350.00 Adcom Gfa 5400 2 Channel Stereo Power Amplifier Outstanding!Adcom Gfa 5400 2 Channel Stereo Power Amplifier Outstanding! $349.95
New ListingEarly 90's Adcom Gfa-535 Power Amp and Pre amp Gtp-500New ListingEarly 90's Adcom Gfa-535 Power Amp and Pre amp Gtp-500 $300.00 Adcom Gfa-535 stereo amplifier Tested & working! (Missing Button)Adcom Gfa-535 stereo amplifier Tested & working! (Missing Button) $139.99
Classic Adcom Gfa 555 Ii Amplifier, Working and Sounds GreatClassic Adcom Gfa 555 Ii Amplifier, Working and Sounds Great $725.00 Adcom Gfa-7500 5 Channel Thx Power AmplifierAdcom Gfa-7500 5 Channel Thx Power Amplifier $466.95
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Prices current as of last update, 08/01/25 6:20am.

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