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These NOS RCA red base 5691 (either JAN or commercial version) are an excellent drop in replacement for any 6SL7 tube type and are considered to be one of the Holy Grail of 6SL7 tube types. Various brands available but all are made by RCA with red base. $194.99 per tube.
7062=E180CC Holland Dual Triode Experience Music DM70 amp Aria WV5XL phono preamp Mike Elliott design 2008 Eastern Electric Mini-Max Conrad Johnson P45 amplifier 1980's Exemplar
Holland Made Philips SQ E180F 6688 tubes. Triple Mica gold pin construction! 6688=E180F 10,000 hour 9 pin broadband pentode. Recommended for: Nobsound- here is a link to a video made by one of our customers after he received his matched pair for his Nobsound headphone amp: https://www.facebook.com/scott.lowell.5/videos/10208623852628597/ Supratek Chenin Cortese preamp Yamamoto 06-3 2010 $29.99 per tube
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