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Old 5th April 2012, 12:38 PM   #2331
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My daily "driver"

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Old 5th April 2012, 03:19 PM   #2332
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Your (low bias) CFP ?
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BOXES for crying out loud
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Old 5th April 2012, 03:26 PM   #2333
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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.
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Old 5th April 2012, 05:21 PM   #2334
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by perys View Post
kees52: build it for your pleasure - I like it just as posted: naked, narrow, open, with very nice 20kHz square!

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.
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Last edited by kees52; 5th April 2012 at 05:36 PM.
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Old 5th April 2012, 05:54 PM   #2335
perys is offline perys  Czech Republic
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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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Old 5th April 2012, 08:04 PM   #2336
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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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Old 5th April 2012, 08:50 PM   #2337
perys is offline perys  Czech Republic
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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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Old 6th April 2012, 07:36 AM   #2338
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Quote:
Originally Posted by lubo28 View Post
We have very interesting company in Slovakia, Quickpanel. Your layout is manufactured on CNC with aditional anodize oxidation and engraving.
QuickPanel - Frontpanely na mieru, prístrojové panely, èelné panely, hliníkové panely
Yes, the parts were made in several companies:

• PCBs - Semach
• Coolers - Gatema
• Panels - QuickPanel
• Gold - LIS

My work all designs and drawings.
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Old 6th April 2012, 07:43 AM   #2339
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Old 6th April 2012, 07:45 AM   #2340
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