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TDA7294 American ST-French semiconductor original mono high power amplifier classic power amplifier chip - AliExpress
Jadis JA-80 MK II mono valve power amplifier - Hi-Fi+
Ultra-compact 4-channel Stereo Headphone Amplifier Upgraded Mini Audio Amp With Mono & Stereo Switch Power Adapter For Studio - Electric Instrument Parts & Accessories - AliExpress
LA 500 amplifier - Blam Audio
AM400 Signature - ATOLL ELECTRONIQUE
AUDIOPHONICS MPA-M400ET Power Amplifier Class D Mono Purifi 1ET400A 1x400W 4 Ohm - Audiophonics
Little Labs Monotor 2-channel Headphone Amplifier | Sweetwater
Amazon.com: Pioneer GM-D8601 Class D Mono Amplifier with Wired Bass Boost Remote : Electronics