Haven't tried them, but Lee's Electronics in Vancouver sells amps with them and those type as replacements and I have read no bad reviews so far.
I've been using them for about eight months. They sound fantastic and have been reliable. After the first couple of days, I haven't needed to re-adjust the bias voltage.
I purchased mine from www.dougstubes.com.
I purchased mine from www.dougstubes.com.
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