1980’s Philips (made on Sylvania equipment) 12AX7WA NOS Long pinched Plate $119.99 per tube. Same ultra durable construction as the Sylvania 12AX7WA. Not recommended for high gain positions.
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NOS Vacuum Tubes for Sale | Tubes Unlimited
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Holland made premium quality 12au7 just $148.99
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.