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Recently disgourged tube assortment.

Knuckledragger
in Headphone Amplification

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One RCA (Mullard) EL34 says "Xf4 B5J1" and the other says "Xf4 B602" upsidedown.

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Ahhh ok... The XF4's are the last of the Mullard EL34's and not as good as the rest but no slouch though. They are worth less though.

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