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Double-tuned amplifier - Wikipedia
CIRMECH AC double 24V double 12V pure copper fever ring transformer 200W ring Bull Power Amplifier 110V 220V optional
One amplifier, two transformers | diyAudio
AC Double 28V Double 12V Single 12V Pure Copper Fever Toroidal Transformer 200W Ring Power Amplifier Fire Ox 110V 220V Optional
DJ Dual Transformer 2 Channel Stereo Audio Power Amplifier
An Experimental 33A/158M Double Triode Push-Pull Audio Amplifier
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