- Posted by mqracing (M) on April 29, 2009 at 09:00:21
In Reply to: RE: Hey Mike, how about this idea? posted by danlaudionut on April 28, 2009 at 23:10:22
Hi Dan:
You framed the questions very well...
I'll make just a few comments.
Under your first point--- the reference L of 200H is for M6. In Keto's intended application I would opt for a nickel based core which will increase the L severalfold.
Re: loadlines and "nominal" impedances and etc--- please see the following post;
http://www.audioasylum.com/forums/magnequest/messages/8798.html
I agree with you Dan--- I would not load the secondary and, instead, would do the volume control on the "front side" of the voltage amplifier.
Will also make finding a suitably good quality attentuator\potentiometer much easier.
Another suitable plate choke--- physically smaller than the EXO-99's and less expensive--- is the EXO-010. The 010 is rated at 275 henries--- which at 20 hertz would give you a load impedance of a bit over 34K. I keep thinkin' that if it were my project I would first consider using the 010. Smaller core, smaller winding lengths equals less capacitance that must be driven.
grid choke on input side of voltage amp--- yep--- though I might also look at using a 1:1 with 10K volume control (think high quality Penny & Giles 10K stereo unit).
Thanks Dan for responding. I've been sidelined a bit--- seems I can work a few days and then must give my ribs a few days "off"--- just saw my family doc yesterday and will soon be seeing a muscle, bone, and joint specialist. This shit has to get better sometime soon.
MSL
Builder of MagneQuest™ & Peerless™ transformers since 1989
