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#2331 |
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diyAudio Member
Join Date: Jan 2005
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__________________
The point of life is to build atleast one audio amplifier before you die.
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#2332 |
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diyAudio Member
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Your (low bias) CFP ?
__________________
Not so much,.......if it says "ZM" in the corner. |
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#2333 |
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diyAudio Member
Join Date: Jan 2005
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Nope, i rebuilt it to EF, or SF as its mosfets rather than bipolars, and its running a total of 150mA bias per channel.
__________________
The point of life is to build atleast one audio amplifier before you die.
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#2334 | |
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diyAudio Member
Join Date: May 2009
Location: Sprang-capelle Holland.
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Quote:
Thanks well, i have it on test, this day I did test a lot of tubes, (voltage stage) and wauw what a differences, now I listen to the 6J51P this penthode sounds the best of all, very wide open stage even in mono I am pleasured, I have feedback and can set if off, the amp is so stable that I can solder an the feedback without a problem, just with wires, the amp has not no coil in output. very beautifull sound so livelike and open, far better then with cathodefollower driving mosfets, so I have invited some audio nerts to listen, in mono at first and build a pcb. still not problems after days of testing, it has done 130 watts in resistor for 24 hours, it was a a kind of stove but survived, not to hot.. As you see on picture I am glad I have no wive, but yes it is very exciting and feedback??? if it is current feedback then sound is not really affected, with out feedback the soundstage is differend thats a fact, but when good and low feedback then it makes sound clean without clinic effects, that occur when the amp has a very high open loop, better is good components use and low only current feedback like most tube amps have. One drawback of current feedback, it is very offset unstable so the need of a (very well designed) servo amp is needed or thermical coupling of components what not always work. Last edited by kees52; 5th April 2012 at 05:36 PM. |
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#2335 |
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diyAudio Member
Join Date: Aug 2011
Location: CZE, deep village, but: near to Prague
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when make some PCB and case for it, it can worse its sound....
open and airy sound is just related to open and airy construction. by the way, would you show here schematic (or post it to me as a private msg) of the unit? ..to I could better understand to your enthustiastic comments, many thanks |
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#2336 |
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diyAudio Member
Join Date: Aug 2003
Location: Prague,Czech Republic
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...open and airy sound is just related to open and airy construction....
Yes, it is sentence, which you can sculpt to the stone, Perys....
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#2337 |
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diyAudio Member
Join Date: Aug 2011
Location: CZE, deep village, but: near to Prague
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Thank you, thank you, really:-)
Ok, open and airy sound does not depend ONLY of this, but ALSO of this. I mean it seriously. But with no objective evidence .. |
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#2338 | |
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diyAudio Member
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Quote:
• PCBs - Semach • Coolers - Gatema • Panels - QuickPanel • Gold - LIS My work all designs and drawings. |
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#2339 |
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diyAudio Member
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#2340 |
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diyAudio Member
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