No products in the cart.
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.
You must be logged in to post a review.
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
Add to cart 
tubes-admin –
Very sweet sounding tubes with smoother low end and crisper high end than the original driver tubes. This is strongly recommended in tube-rolling threads, among others. Well worth the cost to upgrade.