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A Survey of Four Sets of Power Tubes in Two Push-Pull Amps | Wall of Sound | Audio and Music Reviews
Output tube interchangeability - using different types of tubes in an amplifier??? | Audio Science Review (ASR) Forum
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B-STOCK (BS-58) Electro-Harmonix EL34 Power Amp Tubes (UNIT) NON MATCHED PAIR | Music Bliss Malaysia
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