Posted by Damir [ 213.202.110.2 ] on December 04, 2005 at 14:17:44:
In Reply to: Re: 300B cascode + grid choke Spice simulation posted by MQracing on December 04, 2005 at 11:52:57:
Of course, this is the example of possible LF and HF driver "problems" when we can "blindly" put a grid-choke in existing circuit, without optimisation. OPT here is just a simbol, I use a similar circuit for OPT (with added leakage inductance).
I`m aware about resonances, and Q=[(L/C)^0,5]/Rw - with "real" components it`s not easy to get Q=0,5, or critical damping, and some designing compromises are in order. Little boost on 10Hz probably isn`t tragic, no NFB, and output stage is already "down" here. "Over all" frequency response simulation shows little "hump" in subsonic area, but simple anlarging of Ci can handle it, and I like it more that way :-).
Cascode driver (few versions) is a just one option, I`ll try some others, too. After "technical" optimisation, the listening test will be crucial:-).
Thanks for comments and suggestions, and thanks for link - good summary :-).
[ GroupBuild Forum ] [ Help ]