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NOS Vacuum Tubes for Sale | Tubes Unlimited
#1 ONLINE Source for NOS Vacuum Tubes
This is a suitable replacement for any 5847=404A tube type. Various brands available.
USA made 6688=E180F These 6688A have black plates, nickel pins, and Amperex orange globe printing
10,000 hour heater, frame grid, broadband Pentode
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M-F 7:30AM-3:30PM CST