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In Reply to: Re: What make a transformer good ? posted by bpur on February 21, 2007 at 14:01:31:
Ma, come quick! I'm gonna grab me a big ole' chunka pig iron an'
wrap it all up with some bailin' wire --cause it jus aint'
possble to makes a "Bad" transformer! --I heard they're all
good'ns! Eureka!-T.M.
Follow Ups:
n fur shur at ole pig iurn z gud nuf tu lykle don neyd no baylin ware needer jez de pig whudl fid tru da hoal nda fenz dere
I personally know a guy who has used door bell transformers and out-performed other amps with really "good" outputs in them. Bud is generally correct here, the circuits are all worse than the output iron is what I like to say.
Hi Jeff,Mmmmmmm well maybe not quite that biased, from my point of view. As an example, you can take an amorphous core Lundahl SE ouput and put it in an amp with the finest passive components, hand wired , with really expensive 300 B, or your choice of Golden Lions, all point to point connected, with an instrumentation ground scheme and have that amp sound thin on sudden transients, sharp and murky on midrange tones and loose and thick on Bass, because you used a solid core thin plastic wire for the grounds. It isn't the circuit nor is it the wickedly fast OPT that is causing the poor sonics. It's the lousy ratio of copper wire surface area to dielectric mass in the ground wire. When you go back to Greg's lift those extra ground wires and give a listen. Then go find some true Litz wire, with insulated strands and all, slip it into some shrink tubing that fits closely and replace all of the ground wires in his amp. You will be edumacated bout dielectrics, electrostatic moments of coupling to dielectrics and likely how much surface area to dielectric mass is too much.
Just a thought experiment here, but I do exactly this when an OPT or IT that should be just fine is not. And also when I am faced with modern single sided PCB's, with no poured grounds and poor or zero dielectric on what grounds they have, cd players of all persuasions come to mind.
Yes!, Greg is gonna rebuild the 245 amp with PROPER wiring, of course, after hearing and understanding the wire-consequences on grounds in a SEer !!
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