Tube Recommendations for the BHK Mono & Pre

I’m sure that this is a much discussed topic with a range of opinions. I have had a pair of BHK mono amps and the BHK preamp for a few years and have never changed the tubes.

Two questions:

  1. Should I change them?

  2. If so, what should I replace them with? I know PS Audio sells replacements - are those the ones to get or are there others that people really love?

Thanks in advance,

If you search “tube rolling” here, you’ll be kept busy for weeks

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I think the recommendations is once a year or every 10,000 hours I thought I heard or read that somewhere on the forums. As far as what tubes? Like what RonP said tube rolling thread and a couple days to read it.