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Nagra VPA 845 retubing

Hi. I have a pair of Nagra VPA monoblocks with 845 tubes. I bought these used. When I contacted a local dealer I was told that I should only buy tubes from Nagra, because Nagra supposedly ensures that they are perfectly matched and are fully compatible with the amps (they costs 900 a pair!). Is this true, or is this a racket? Has anyone tried other matched 845 tubes than those sold by Nagra? If so, any preferences? Thanks
obrennan1963

Showing 3 responses by brf

brf
1,715 posts
 
$900/pr for current production 845 tubes is a lot of money. What make are the Nagra supplied tubes?
brf
1,715 posts
 
Nagra at one time used KR Audio 845 which retail in the 900/pr range but I thought Nagra dropped them due to reliability issues and started using Chinese sourced 845.

Which version of the VPA do you own? Does it have the built in tube protection circuit?
brf
1,715 posts
 
Philipwu, I believe that was true with the first generation VPA and especially with KR Tubes. Nagra later fix this problem in the second gerneration VPA which allowed for a wider variance of 845 to be used.
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