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#2821 |
diyAudio Member
Join Date: Feb 2002
Location: Canada
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#2822 |
diyAudio Member
Join Date: Mar 2010
Location: Olalla, Oregon: Land of the 100 Valleys
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#2823 |
diyAudio Member
Join Date: Apr 2003
Location: MA
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Needs some work. Looks a little etch-a-sketchy
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#2824 |
diyAudio Member
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Just a bit of cosmetics...hardwork is done
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#2825 |
diyAudio Member
Join Date: Feb 2004
Location: Davis,CA
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Confirming pinouts are different for the Onetics. Hopefully I can be listening before leaving for Seattle on Monday
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#2826 |
diyAudio Member
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O.K. here comes the minority report for ZM....
ISKRA has lowest THD in my measurements, a small bit lower than Jensen.... means 0,004% smaller.... ![]() because k2 is still lower than the k2 of Jensen. Buzz said this could be sign of the similarity of windings.... k3 is a bit higher than the k3 of Jensen.... so if I increase the k2 to surpass the k3 about 6db I get with the ISKRA a bit more THD than with the Jensen, that may be the reason I find the ISKRA a bit more detailed and less dry. ![]()
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and the First W ![]() ![]() |
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#2827 |
Official Court Jester
diyAudio Member
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my Papa is smarter than your Nelson ! clean ![]() ![]() ![]() |
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#2828 |
diyAudio Member
Join Date: Feb 2004
Location: Davis,CA
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IMG_2476.jpeg
Here is my first PTP wiring attempt - I know needs improvement PSU choke filter +/- 24V Current at R100s 1.48 A Voltage G -S on R 100s = 1.38V DC offset approx 5 mV Will put it in system later this evening unless I hear not to Thanks everybody |
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#2829 |
diyAudio Member
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I hope you will like PtP.....!
Do not forget to put an 500R or 1k pot nearby to put it parallel to the upper secondary if you should need some more k2.... ![]() May I all ask again....? The original circuit Nelson gave us had in my build k3 and k2 on the same level, is this intended or due to my build and parts? Shouldn't k2 be dominant per se? My second channel even had k3 higher than k2.
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and the First W ![]() ![]() |
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#2830 |
diyAudio Member
Join Date: Oct 2010
Location: Burlington, NC
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I am sure it is similar to the J2, in that all the parametrs matter. Isnt ig the easiest amp to play around with. Have you tried switching the phase of yhe top and bottom secondaries?
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