Change tube in SCT700

[nstu]

Can anybody give me some advice of changing the tube in my tbone sct700.

i found something of changing the tube in the sct800 and sct2000 but not the 700 and the body is different.

for the price (150 euro) i found the sct700 okay...so maybe it can reach an other level with an other tube?

i don't like the harsh highs. "s" is very strong.

i know that it's not the sound of an "real" tube mic, but maybe i can push it a bit in the right direction.

so wich tube? or anything else?

here a the shop were i would order:

Onlineshop Startseite
Tube-Town Online-Store


thanks for any advice