Originally Posted by lestat26
Since I don't have much experience with the mechanics or cosmetics of tubes, how does the one that i have look? Think it looks like it needs rejuvenation methods? I will get to hear this tube in my K2 mic here by next week , so I will hear how it sounds, but but until then I don't know if the pins look corroded or dirty,, I am sure there's more to the inside as well, and usage, but forgive my noobyness here.....
The appearance of your particular E88CC gives no indication as to the condition. Some people think there are certain tricks but the truth is, if the getter flash is large (like it is in yours), you can never tell. Corroded pins are common. Use 2000-grit (automotive style) sandpaper until the pins are clean. Then, treat them with some kind of protectant (like deoxit/pro-gold).
If the tube is near the end of it's life, it will probably sound dull and lifeless. Regarding rejuvination, IMO, it's a last-ditch effort and should be strictly regarded as an alternative to throwing the tube away. I don't bother with it because I would never sell a rejuvinated tube as they are not reliable.
Bad/weak tubes are not usually found at electronics stores because most responsible techs have the good sense to throw them out. So, yours should be ok. Weak tubes are usually found on ebay where tube fraud is rampant.
I think your main concern here is going to be microphonics. Out of the hundreds of 6DJ8/6922 variants I've had, only about 1 in 10 ever makes it to a microphone and about 1 in 20 can be considered for high-end mics. Chances are, yours may be tolerable but succeptible to vibration noise. Here's hoping for the best.
Keep your fingers crossed.