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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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This Amperex branded 6679 was made in in eastern europe and is an excellent value in the 12AT7 tube category. Far exceeding thquality of any 12at7 tube being made today.
6679=12AT7
USA Made Philips PQ E180F 6688 tubes. Triple Mica gold pin construction! These are an excellent value,,,same Philips contruction only made in the USA
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.