2 pcs remaining, NOT matched. 1960’s, Blackburn factory. $299.99 each. NOS in original boxes. ECC33=CV2821=6SN7G tube type.
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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!