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Tube kit for Nagra PL-L?

Nagra recommends that users purchase a "tube kit" from them as tube replacement. This at a price of a couple hundreds of $. What is so special about these tubes? Aren't these Sovtek tubes that are easily available off the shelves?

Any one made any comparison with these tubes?
shsohis
bjbcab
131 posts
 
How do you know if your tubes need to be changed? How many hours?I looked inside my PL-L because is thought there was a usage gauge but I did not see one. I just googled and I do not think that this was in my model but apparently was in older models.

It could be my imagination but I do think the sound is degrading. Not as liquid and maybe a little harsh at times. I do not have a lot of experience with tubes so curious of thoughts.
mechans
3,048 posts
 
Do yourself a a real favor and get your selected very low noise and well matched tubes from Jim McShane over at audio asylum. Very fair prices, great service and advice. I have bought mainly new production but also a small number of NOS My experiences with him have been really positive.
P.S. I am not a shill, just very pleased with this dealer.
xti16
1,525 posts
 
+1 regarding Jim McShane. Very fair and extremely honest.
http://www.mcshanedesign.net/tubes.htm
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