$160 per tube branded as Sylvania or Phillips ECG. This is a suitable replacement for any EL34 = 6CA7 POWER PENTODE tube type. Various brands available.
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NOS Vacuum Tubes for Sale | Tubes Unlimited
#1 ONLINE Source for NOS Vacuum Tubes
4-400a=8438 2 in stock Branded as Amperex or Eimac
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.