Holland Made Philips SQ E180F 6688 tubes. Triple Mica gold pin construction!
6688=E180F 10,000 hour 9 pin broadband pentode. Recommended for:
Nobsound-Â 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
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.