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The Brimar CV4004 is an excellent UK made 12AX7 with a quasi boxed anode. Long plate construction, superb for phono stages, hifi, and guitar amps! We have a limited supply of low noise selected tubes, as well as Brimar CV4004 with balanced sections. $119.99 per tube!
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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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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.