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Power tubes
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1) RCA 6550/KT88 VACUUM TUBES - (USED) TESTED GOOD | #1693742340
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RCA 807 VT100 = 6L6 EL34 NOS Fabriqué aux États-Unis Testé par Amplitrex... EUR 130,93 - PicClick FR
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RCA 6550 NOS Quad Set Of Power Tubes With Boxes PENDING SALE Photo #56367 - US Audio Mart
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RCA 6550 Hole Grey Plate Triple O getter Slightly Used Nos Testing Quad | eBay
6550 RCA - 中古オーディオ 高価買取・販売 ハイファイ堂
