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The infamous 6BM8 cookie can amp.

http://www2u.biglobe.ne.jp/~hu_amp/6bm8amp.htm

6BM8 has gained popularity amongst Japanese DIY'ers who use it in the so-called "super-triode" configuration. The circuit uses the triode section of 6BM8 in the feedback loop of pentode section. The theory is that the whole thing then looks like a triode with very low Rp - hence the name Super Triode.

At least that's what is claimed by the guy who started it:

http://www.ne.jp/asahi/evo/amp/index.htm

And the link below is the example of 6BM8 super triode amp. Scroll down for schematics:

http://www.ne.jp/asahi/evo/amp/6bm8/report.htm


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