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In Reply to: How good is the sound of 6BM8 based tube amps? posted by Raver on December 11, 2003 at 23:42:52:
Hi Raver;The 6BM8 is "one of the good ones" IMHO. I don't know about the specific circuits you mention, but it could well be that they were held back by the quality of their OPT's, particularly if they were SE designs.
FWIW, the 6BM8 is one of the faves of Japanese DIYers.
Follow Ups:
There is a hobbyist group that only allows the use of a single 6BM8 per channel!
I think that this group is based in Tokyo.I saw pictures of various 6BM8 amps housed in the most unbelievable housings(candy boxes and the like).
Raanan
Hi Raanan;Hmmm, I'll have to hunt around and do some websearches. I know that I've seen the "candy box" 6BM8 before, and I used to have some Japanese language DIY sites bookmarked. Unfortunately I lost a lot of my bookmarks the last time my system crashed.
Hi Jim;Very interesting! Hmmm, have they got a webpage? I'd love to see some of their efforts online.
See the link below for a pic of my 6BM8. One of these days I'm going to upgrade the iron on it and see how much better it can sound - very good now but the $9 OPT's limit bass response a bit too much....
All the best,
Morse
Unfortunately, I don't know the URL.
http://home.h00.itscom.net/6bm8/audioclub/index.htmEnjoy!
Quest;^>
Yes it is in Tokyo.... Here's one that use those 6BM8 amps (In cookie aluminum cans) to drive very small Fostex backloaded horns (dorm room speakers!) Another similar tube I like is the ECL86. Here's a Japanese link in English btw.Derick
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:
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