A friend of mine expirienced a tube failure twice in his VPAs. There was no other damage other than the tube itself. Each time tubes were replaced by Nagra under their 2-year warranty free of charge.
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I have a pair of VPA and PLP....with changing the original tubes to KR845,,, it is working fine for almost 2 years... The failure may be caused without TUNING the load meter properly , there is 2 small hole at the right hand side of the VPA side pannel ..the user package also provide the screw driver and the spare fuses....please refer to the user manual for how to tune the load meter .........Remember to mark down the original setting before starting the tuning....Just in case , if you what to use the original 845 tubes .... Hope it may help.