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Old 12th January 2013, 08:01 AM   #51
WrineX is offline WrineX  Netherlands
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Nothing in between the laminations as far as I can see
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Old 12th January 2013, 10:30 AM   #52
Elvee is offline Elvee  Belgium
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0.5mm laminations are for PT use, not audio.
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Old 13th January 2013, 01:23 AM   #53
WrineX is offline WrineX  Netherlands
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Even if it's 2 thick ?
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Old 13th January 2013, 08:04 AM   #54
Elvee is offline Elvee  Belgium
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Quote:
Originally Posted by WrineX View Post
Even if it's 2 thick ?
What do you mean?
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Old 15th January 2013, 01:12 PM   #55
WrineX is offline WrineX  Netherlands
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Quote:
Originally Posted by Elvee View Post
What do you mean?
2 cm thick, i mean stacked.. what should one laminate look like ? for an audio tranformer
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Old 22nd January 2013, 04:05 PM   #56
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Quote:
Originally Posted by WrineX View Post
2 cm thick, i mean stacked.. what should one laminate look like ? for an audio tranformer
The stack height of laminations(2cm) determines the core area, which in part defines how much voltage you can apply at a given frequency before saturating the magnetic material the core is made from. However, the material that the core is made from will define how linear the magnetization curve is, independent of the stack height.

I believe what Elvee was saying was that lamination of 0.5mm thickness are usually only found in power transformers which would mean lower quality, less linear magnetic properties. Laminations made for audio use tend to be thinner than that. The thickest "audio grade" laminations I have seen were about 0.3mm.
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Old 11th December 2013, 04:10 PM   #57
WrineX is offline WrineX  Netherlands
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Quote:
Originally Posted by bolserst View Post
Hello Elvee,
Is this the test you propose? (see attachment)

1) With switch open, adjust the output of the preamplifier to a low level that produces audible distortion in the ESL.
2) Close switch to add/mix in a high amplitude ultrasonic signal with the audio going to the power amp.
3) As the amplitude of the ultrasonic signal is increased, the amount of core distortion should decrease resulting in less audio distortion heard in the ESL.


@alexberg,
WrineX has tried several power amplifiers with identical results.
It seems unlikely that all of his power amplifiers have DC offset problems.
.
sorry to bring back a very old post, but since i got again the same problems with different panels but same amplifier,same High voltage cascade and same tranies. Also tested with a new transformer (T300), from audio 4 , a person that makes tranformers as upgrade. (same result so trannies should be ok)


The problem

If i listen without the 20 K tone on and i add volume the sound is really tiny and distorted then there is a certain point almost like fliping a switch where the sound breaks lose undertones are filled in again and it does not sound distorted

i did the test with the test tone, since i can only put out 20Khz on the laptop i was limited. with the 20k tone on, it did sounded less strained, like what happended when i just increased the total volume. it sort of opens up, when the 20K is added lows get fuller again (weird but true).
Still not completely gone.

Does this indicate DC offset of the amplifier? or could there be another thing causing the same problem ? because as mentioned i tried 3 amps, back then One rotel, one class A Stemvoort, and the pioneer reference.

would be a lot out of the lotery to have 3 amps with Dc offset? (sold 2 to already)
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Old 11th December 2013, 04:13 PM   #58
jcx is offline jcx  United States
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try a DC blocking Cap between the amp and xfmr - big nonpolar electrolytic
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Old 11th December 2013, 04:45 PM   #59
WrineX is offline WrineX  Netherlands
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like a normal cap used in crossover ? but then huge ? hmm what about the actual crossover cap where does that one go.
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Old 11th December 2013, 05:25 PM   #60
Bazukaz is offline Bazukaz  Lithuania
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Quote:
Originally Posted by WrineX View Post
like a normal cap used in crossover ? but then huge ? hmm what about the actual crossover cap where does that one go.
The larger the better. Voltage drop across the cap should be low to avoid distortion from trafo. IMO 4700u@63v isnt too much. Even polarized could be used for testing, often theres not particularly big difference between polar and non polar.
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