Most of the tubes have their prints well preserved after the years. The Heerlen codes ▲2. are on the tubes.
Item Tag: Tubes
One Matched Pair Rare 7062 / E180CC (12AT7) Tubes Philips, SQ Heerlen,Holland
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Pair of 300B-98 Tubes By Shaguang, New Ratings
The underrated tubes in the market.