Posted by Norris Wilson [ 208.100.218.223 ] on November 10, 2008 at 12:16:53:
In Reply to: Back to the Aikido posted by Bill Epstein on November 10, 2008 at 09:40:28:
Looking good Bill,
I haven't looked at the Akido design lately. I was wondering if the second 6SN7 is a cathode follower? If it is, it might be fun to somehow install a switch where you can switch out the first 6SN7 gain stage.
I owned a VAC preamp several years ago that had switchable gain stages that used 12AX7's for the gain, and a 12AU7 for cathode follower. Switching out the gain stages all together was my preference, but had a slight negative gain. As with all components in the signal path, they introduce their own signature.
Keep us informed of your progress?
I am very curious of how well your 2 watts will go towards driving the Four Pi's?
I will be building a 2.5-way version of the Four Pi using 2226J's with Beyma CP-385ND 1" CD and TD-250 horn.
I am hoping two watts will be enough to get them a rocking at 100db efficiency.
Have fun!
NW
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