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16th November 2012, 04:03 PM
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#2821 | |
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diyAudio Member
Join Date: Feb 2002
Location: Canada
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Quote:
Regards, Dan 
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16th November 2012, 07:07 PM
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#2826 |
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diyAudio Member
Join Date: Jul 2009
Location: Near Frankfurt
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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 tt is......a really First Class P SS Idea
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16th November 2012, 07:11 PM
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#2827 |
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diyAudio Member
Join Date: Jan 2003
Location: ancient Batsch , behind Iron Curtain
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__________________
my Papa is smarter than your Nelson ! clean  thread; Cook Book;PSM LS Cook Book;Baby DiyA ;Mighty ZM's Bloggg;Papatreasure;Papa...© by Mighty ZM 
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16th November 2012, 09:12 PM
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#2828 |
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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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16th November 2012, 09:22 PM
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#2829 |
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diyAudio Member
Join Date: Jul 2009
Location: Near Frankfurt
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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.
__________________
and the First W tt is......a really First Class PSS Idea
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16th November 2012, 09:29 PM
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#2830 |
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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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...Shape the sound , Man! |
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