This is a suitable replacement for any 6J5 = 6J5G = 6J5GT = 6J5WGT Triode tube type. Various brands available.
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!