(Well my evening it not so good)
One of the 4 KT88 (Genelex / New Sensor) tubes in my Mark III 'blocks seems "buggered" (to use a descriptive English technical term). It causes a static - like noise (think of rustling paper) on one channel, and I have isolated it to one specific tube - the "rustling noise will "travel" with the tube if you switch it to a different channel (yes, my NEW Mark III monoblocks :-(!! ).
Not only that, but it will not keep a bias setting - I set it, then five minutes later it is totally different and I have to set it again. The bizarre thing for me though is that in spite of this, it sounds as good as ever - sonically you can't tell anything is wrong, other than the static on that channel.
I guess it is a safe assumption to say that the tube is bad. Over the past 6 weeks the set has been running about 15 hours a day from being brand-new.... My question: Surely I should get a lot more than 500 hours out of it? I have heard some negative comments from the guitar playing community regarding this tube (whereas the same-brand KT66 Gold Lion seems to last much longer, if I understand correctly). Can you guys think of any tube that sounds as good but is more reliable?
Last edited by JunkyJan on Fri Nov 05, 2010 12:01 am; edited 1 time in total