PL509 40KG6 Philips Holland, made in Philips Heerlen plant. True triple mica construction and three holes in plates.
“AAA” Philips type code for PL509, delta3A3 & delta1E1 codes.Triple mica spacers clearly visible on photos above.
This is matched quad within 10%, perfect for push pull PL509/PL519 40KG6/40KG6A amplifier.
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