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Sylvania NOS VT-231 6SN7GT Low noise $189.99 per tube enter qty 2 for matched pair.
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Sylvania NOS VT-231 6SN7GT Low noise $189.99 per tube enter qty 2 for matched pair.
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USA made 6688=E180F These 6688A have black plates, nickel pins, and Amperex orange globe printing 10,000 hour heater, frame grid, broadband Pentode
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.