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![Immersion Heating with a Vacuum Tube | [protofusion]](http://protofusion.org/wordpress/wp-content/uploads/2015/01/vacuum-tube-in-water.jpg "Immersion Heating with a Vacuum Tube | [protofusion]")
Immersion Heating with a Vacuum Tube | [protofusion]
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Constant Current for Tube Heaters. Extend the Life of Your Amplifier's Vacuum Tubes | audioXpress
Constant Current for Tube Heaters. Extend the Life of Your Amplifier's Vacuum Tubes | audioXpress
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On Vacuum Tube Heaters — Tropical Fish
