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Electronics-Salon 100W 4 OHM Audio Power Amplifier …
https://www.amazon.com/Electronics-Salon-Audio-Amplifier-Non-inductive-Resistor/dp/B00N8QE2PM
Make sure this fits by entering your model number. 4 ohm 100 Watts Non-inductive Wirewound Coated Ceramic Tube Resistor. Quantity: 1 piece. Resistance Tolerance: +-5%. Maximum Length: 225mm / 8.86", Maximum Height: 68mm / 2.68". Tube Diameter: 29mm / 1.16".
Amazon.com: 4 ohm resistor
https://www.amazon.com/4-ohm-resistor/s?k=4+ohm+resistor&page=3
4 Ohm 100W Non-Inductive Dummy Load Resistor
https://www.parts-express.com/4-Ohm-100W-Non-Inductive-Dummy-Load-Resistor-019-015
Non-inductive dummy load resistors are a must for bench testing amplifiers. Also useful for testing loudspeakers and other audio circuits requiring a 4 ohm load. 5% tolerance. Dimensions: 6-1/2" L x 1-9/16" W x 3/4" H; Inner width of the screw holes: 5.4 mm; Inside edge to inside edge measurement between the two screw holes: ~144 mm.
Adding resistor to make 4 ohm speaker 8 ohm ...
https://www.diymobileaudio.com/threads/adding-resistor-to-make-4-ohm-speaker-8-ohm.107532/
S3T. 1. Half of output power will be lost on resistor. Therefore, if you wish to use 100W amplifier (which is rated 100w into 8ohm), get yourself 50W resistor. Amplifiers rated 100w into 4ohm will deliver 50w in 8ohm. Half of that power will be lost in resistor (25w) and other half will drive the speaker. 25w...
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