Rectifier tubes get very hot and don't last as long. One reason I purchased the BAT VK-80. The downside is some tubes are very expensive and some tubes just don't last as long as they should. If you have more of a minimalist type tube preamp that uses just a couple of tubes it may be more reliable especially if it uses cheaper and more common preamp tubes.
it's not the tube life that i'm worried about, the 12au7 tubes are relatively cheap , and there are only 2 of them. it's the comment that the design of a tube preamp won't last nearly as long as a solid state preamp
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