The E88CC also known as the 6922 is a high quality double triode originally introduced by Mullard in the 1950’s. They re-arranged the part number from the expected ECC88 to E88CC to highlight that it is designed as a long service valve. This is different from a ruggedised valve .
Note that while this valve can be classed like an ECC83 /12AX7 :
The E88CC is NOT pin compatible and not designed to replace an ECC83/12AX7
We test each E88CC in addition to full factory testing by JJ Electronic
Long service means lasting a long time. Ruggedised is designed to withstand a lot of vibration. The alternative part numbers for the E88CC are ECC88, 6922,6DJ8 and the Chinese 6N11
"Prompt delivery, boxed and secure, included a tip sheet and a handwritten thank you. All valve sellers should be like this. Highly recommended." - Steven L.
"I don’t think I’m the only guitarist out there who knows his/her guitars, but very little about tube amps. I ordered a Supro valve kit (which is great), but it’s the service, help & advice I received from Stewart that was outstanding. I was going to say ‘these guys’, but it didn’t seem right, as my communication was just with him. Thank you!" - Robert G.