Quote:
Originally Posted by George Prentice
I think it varies by tube and component. For my AR preamp the large 6H30P is 2,000 hours the rest of the 5 smaller tubes it is 3,000 hours according to Audio Research. But after about 2,000 hours one channel developed an intermittent whistle. So I changed all the small tubes and it went away. There recommendation may be based on optimal performance, not how long they will work. I have “heard” there is a performance drop off, but I cannot confirm from experience.
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George, small correction: the larger tube is a 6550. The smaller tubes are the 6h30.