| http://www.w3.org/ns/prov#value | - usable due to excessive microphonics or too noisy...But i do not use problematics tubes, for example my 12AX7 was a SIEMENS Halske, not really a cheap recent 12AX7...The 6BZ7 for example are a very good surprise, try a GENERAL ELECTRIC 6BZ7, really full sounding with plenty of meat, great bass, highs not rolled-off and wide soundstage, perhaps a lack in dynamics compared to long plates tubes (6GU7
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