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In Reply to: RE: The example fails minimum inductance requirements posted by hennfarm on June 09, 2016 at 10:50:31
"No way to have your cake and eat it too, hence the opting for different topologies in finals feeding"
I agree and that was my point.
Single ended amplifiers don't/can't play bass.
I use SS for my woofers and SET for the mids and tweeters.
I think that's as close as it gets to "having your cake and eating it too".
Thanks.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Follow Ups:
"Single ended amplifiers don't/can't play bass."
This I have to disagree with. My 211s work to 20 Hz with no problem. The Magnequest 10K SE OPTs are superb.
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Buy Chinese. Bury freedom.
I didn't know magnesquest made 10k trans. I never had a pair of magnequest trans. But the magnequest preamp trans I have are so much better then any other I have tried.
Edits: 06/11/16
The transformers I'm using are FS-100, designed for 211/845 amplifiers. I run them at 1KV and 70-75 mA in my 211 SETs. I've read that there have been a few different versions of these, including one for parafeed, all with the same model no.
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Buy Chinese. Bury freedom.
Thanks triode I found the blog too and I found the forum. People keep referring to trans that I know nothing about. I want a pair of decent trans.. I am tired of buying shit. I will wait until mike is winding something I can use and afford. How ever long it takes.. I just hope he will wind me a pair. It looks like he is getting busier and busier. I want to try find and research the specs of all the old trans that he winds too. I think they are somewhere on line. I really want a pair of classic push pull output designs with nickel lams or part there of. I will get around too the a big A2 amp eventually. I have enough other amps to finish in the mean time. I will try a a2 3c24 I have trans for that allready. If there any good. I have my doubts. They are soft tones I bought them from japan but they look like chinese to me.
I meant technically speaking. I'm sure subjectively your amps are fine.How much inductance is there in those Magnequest 10K SE OPTs?
Do they meet your 5X/10X rule?
It would take 400Hy to be 5X (50k ohms) at 20Hz.
The load line is going to be an ellipse. I don't think there's any getting around that.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 06/10/16
I get the sense that you think the reactance of the inductance of a plate choke in a pararfeed circuit is in parallel (shunt) with the reflected impedance at the primary of the parafeed OPT.I believe that is true.
I also get the sense that you don't think the reactance of the inductance of the primary winding of a series feed OPT is in shunt with the reflected impedance.
As far as I know it is.
The only difference is the caveat that you pointed out, the reactance of the plate choke's inductance is also in parallel with the reactance of the parafeed OPT but that would be a small factor. Otherwise both situations are the same.
Bottom line, I don't think a gapped transformer (or plate choke) can have enough inductance to keep the load line from being an ellipse at the lower frequencies.
That is why I say "SET amplifiers can't play bass".
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 06/10/16
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