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High Gain MONSTER: Bogner Uber Ultra EL34
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Bogner Über-Ultra EL34 | Playthrough
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Comparison: Bogner Uber Ultra el34 100w, Bogner Uber Ultra KT88 150w and Wizard Hell Razor el34 50w
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Bogner Amplification Custom Shop - Uberschall Ultra Prototype Playthru
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Mesa Mark IIC+
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EL34 vs KT88-Z Tubes !
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New From Bogner: The Helios JB45
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