2. amps-preamps
  3. 1133922549

Reliability issue - Nagra VPA power not KR tube

I have a pair of Nagra VPA Type I on evaluation. I ran over the weekend. The chassis heated up to well over finger warm. Tubes are obviously very hot - 535 F. My friend that has had a pair for 4 years recently had a major issuethat costed him $ 2,000 to repair. As part of my evalution, I am curios to hear from other VPA owners, what reliability issues they have had and the costs to repair them. Are these amps one should avoid from a reliability point of view. Thanks
dcaudio
gerrym5's avatar
gerrym5
286 posts
 
How does the Super TNT 845M sound compare to the Golden Dragon Select? How would people rank the sound of 845 choices and their most promoment characteristics? Ten being the best.
jlhayes
2 posts
 
I have had a pair of VPA's for about 3 years and a year ago 1 tube went bad and I replaced with tubes from Sophia Electric. They have tubes from Shuguang in China and a matched pair for $210 is great. I installed the tubes and had to adjust the bias somewhat and realized then that they were better and run cooler than the orginals. I would do it again. My VPA's were made before the KR tube came out.
ccchiong
2 posts
 
Does anybody know the scales of meter on VPA? Recently I found the anode voltage of one of my VPA reach the right edge of the "green zone" (both front and rear 845 tubes). I just want to make sure that 845 is running at a reasonable operation point. I have the new version VPA and run with original tubes.
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