Life span of tubes?

how much does tubes costs when replacing ?
i can think that there are lower and higher cost tubes but..how much in general?

thanks:)

Depends on the brand (I'm assuming you mean KT88s here). The Svetlanas probably are in the $30-40 range, I think, from what I've seen on the 'Gon classifieds. Not sure about the Teslas and Chinese tubes, but probably similar, maybe a little less for the Golden Dragons. NOS Gold Lions/Gold Monarchs from Europe (not the Chinese ones from late in their history) are out of sight ($250-350 each, depending on their vintage and condition); if you can get used ones that test good, they are less expensive and can be a good buy.

Rcprince is right of course. Haven't seen any NOS Gold Lions or Monarchs for quite a while. Occasionly you can find one or two used at Billington's in the UK and they cost lots of Sterling. To get a feel for prices of other tubes, I suggest you check Ebay regularly to get a feel how the market is.

Detlof, that's because I'm hoarding over 50 of them! Told you I had a lifetime supply......

Lucky you Rcprince and a long, long life to you and your tubes of course ! (-: