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Old 14th November 2012, 10:13 PM   #2771
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Quote:
Originally Posted by Antoinel View Post
If yes, a theoretical schematic is attached. The following modifications are principally the re-wiring of the parent.
  • The parent output node is now Ground
  • The output node is now the parent Star Ground
  • Each channel in a stereo enclosure must have its independent power supply.
  • The phase notations of the Jensen's primary windings are reversed.
Will it work? Detriment or value?
Brgds
I did a double phase inversion; once at the primary winding of the Jensen [to implement feedback], and a second at the new output node. I am afraid the schematic in the preceeding post still shows a non-inverting diyF6; like the parent.

Will this mod and its parent perform the same? Is there a practical advantage to this modification over the parent?
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Old 14th November 2012, 10:19 PM   #2772
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Originally Posted by lhquam View Post
With transformer coupling there is no reason that you cannot float the power supplies, assuming that the feedback is correctly phased and at the correct level.
OTOH, if you are going to float the power supplies why not implement a circlotron? You can even dispense with coupling transformers if you follow the path chosen by Rothacher The Amazing Fet Circlotron by Mike Rothacher.
Thanks lhquam for your clarification and link. I recall you doing sims with Teaser-6 as a circlotron. I'll look again at Rothacher's paper. Brgds.
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Old 15th November 2012, 10:07 AM   #2773
generg is offline generg  Germany
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some news from Frankenstein 6....

very different pictures, may explain a bit the different character of sound Jensen versus Edcor with my build ...first picture Jensen, second Edcor...

I have to play with the two pots over the two secondaries..... 500R are a good starting point to mistune the distortion ...... ?
Attached Images
File Type: jpg Jensen left 1W 7 Ohm.jpg (89.0 KB, 321 views)
File Type: jpg Edcor left 1W 7 Ohm.jpg (70.1 KB, 314 views)
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Last edited by generg; 15th November 2012 at 10:11 AM.
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Old 15th November 2012, 10:29 AM   #2774
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Edcor looks good to me, but if you can tune out some of the third on the Jensen, you are sitting pretty, I think. I guess that you will probably obly be able to add second, but you never know. Does this show that the Jensen's secondaries are more balanced. This assuming you just swapped the trafos.
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Old 15th November 2012, 10:38 AM   #2775
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Guys with Semisouth gone poof which alternative you think would be closer alternative to R100?
I know it s a big discussion and the answer could be relative especially considering the versatility of the circuit to accept many types.
I just wanted to hear some thoughts
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Old 15th November 2012, 10:38 AM   #2776
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I might get some of the Cree stuff and try it.
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Old 15th November 2012, 10:47 AM   #2777
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Quote:
Originally Posted by buzzforb View Post
I might get some of the Cree stuff and try it.
To do this, I would guess that the LED's would need to be a string of 5 or so, to allow for its 20V+ gate charge. We are assuming it also has less distortion than IRF240 and similiar sound to R100. Won't know until you try.
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Old 15th November 2012, 10:53 AM   #2778
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should only need 10-14V. Input C is a little higher, but Mr miller doesn't look as bad. Wonder how many you got to buy to get a match. Bigger part has much nicer Yfs, but also has all that comes with it.
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Old 15th November 2012, 11:13 AM   #2779
generg is offline generg  Germany
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Quote:
Originally Posted by buzzforb View Post
Edcor looks good to me, but if you can tune out some of the third on the Jensen, you are sitting pretty, I think. I guess that you will probably obly be able to add second, but you never know. Does this show that the Jensen's secondaries are more balanced. This assuming you just swapped the trafos.
yes I just swaped the trafos...same SS side. But of course the data of the Xformers are different.

I will try some more feedback on the Edcors and when I trim the Jensens to have about 12db more k2 over the k3 I have a THD of 0,086%, unfortunately!
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Old 15th November 2012, 12:00 PM   #2780
Ryssen is offline Ryssen  Sweden
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Quote:
I have my F6 running. The sound is between the F3 and the F5, leaning towards the F3 in the upper registers and the F5 in the bottom end.
This sound like sommething I would like to build,I have 2 Jensen JT-11-DMCF
http://www.jensen-transformers.com/datashts/11dmcf.pdf
Can it be used in this amp?
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