Posted by Thrint [ 205.188.116.67 ] on September 04, 2005 at 08:40:55:
In Reply to: so let's speak of mods to the Aikido circuit of John's posted by Thrint on September 04, 2005 at 08:12:01:
Treat it like a McIntosh. The CF section will have lowest output Z with high gain/high gm valves. Triode-strapped pentodes from the video amplifier family are mu of ~40 along with 40 mA/V transconductance.
Smaller cathode resistor gets less impact to output Z w/o breaking the original circuit performance.
Add to this, most of the amps I have build don't need much gain from the linestage and we are into 12B4's for the amplifier half....
cheers,
Douglas
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