up-to-date Gefell UM92s purchase, tube etc advice
I have a chance to buy a Gefell UM92s for what seems a great price here in Japan, the outer body is very slightly marked but otherwise all seems to be fine. Tbh I'm far from a pro in mic-terms...is there anything critical I should be looking for? I believe I have a week or so to return it if there are any problems but I'd rather not other if there's anything glaringly bad.
Also, what's the current advise for replacement tubes? Again I'm a toob-noob, but I'm happy to spend some $$ to get the best from any purchase. Checking threads here and there I see Telefunken ec92 mentioned...is this the same as E92CC? Also looking at various versions of the 6ab4, GE ones, Sylvania, Tungsol...is there really that much difference? Enough to not bother until I find THE tube?
Can I add, what would you consider the upper end of a 'good price' for one of these in good working shape with some slight body discoloration?