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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These E188CC 7308 tubes were made in Heerlen Holland and are one of the best sounding 7308 you can find. Premium quality 6DJ8 variant that has a 10,000 heater and incredible inner resolution and detail. If you want the best, these tubes are the way to go!
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!