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Seymour Duncan Different Kinds of Power Tubes: Know Your Amp — Seymour Duncan
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Audiophile Review - EL34 Family Tube Comparison - thetubestore Blog
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Output tube interchangeability - using different types of tubes in an amplifier??? | Audio Science Review (ASR) Forum
Sophia Electric EL34-ST tubes
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Sophia Electric EL34-ST and KT88-ST Vacuum Tubes - Page 3 of 4 - Positive Feedback
A Survey of Four Sets of Power Tubes in Two Push-Pull Amps | Wall of Sound | Audio and Music Reviews
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