Burning Amplifier Festival Pass Camp 2013 News

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#121
jackh said:
Just wondering how successful the Realiser demo was? Any feedback from participants or from Jan Didden would be appreciated.😀
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Very successful as far as I am concerned. People were generally flabbergasted that it could work so well. This was with calibration to my ears in SL's listening room so not optimized for other listeners, but still.
Same this weekend at RMAF. Totally convincing.

I switched back to 'just headphones', no processing, half way in the demo and people looked shocked.
I will try to get the company to design a stereo version (the A8 is 7.1 surround capable) with USB/S/PDIF input and sell it for $ 999 rather than the $ 3k+ of the A8 😉

Jan
 
#127
I will try to get the company to design a stereo version (the A8 is 7.1 surround capable) with USB/S/PDIF input and sell it for $ 999 rather than the $ 3k+ of the A8 😉
Jan[/QUOTE]

If you can make this happen I'll take one. The realized really works. The only problem was that it made realize(ha ha) how terrible my headphones sound.
 
#128
lhquam said:
The major difference (other than the choice of FETs) is NO FEEDBACK.
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Pls look at post 5120 in the F6 amp thread. The schematic shows Teaser F6CC without global/loopfeedback [as you noted above; meaning like in diyF6]; but with local Schade or Pass Feedback from the output node to the MOSFET gates. The intent [if it works] is to impart triodish properties to the MOSFETs, and thus generate pseudo cascoded complementary SITs with the added bonus of using one main PSU.
 
#132
juma said:
Second part of Mr. Pass' presentation at BAF2013 shows a beautiful JFET preamp circuit. It's simple but very good and endlessly tweak-able.
Still, nobody mentions it here.
Guys, you are missing a seriously good preamp circuit...
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Here is such a tweak. I have been working on a Blowtorch variant for several months. This is a simplified schematic. You will find more on the F4 thread. http://www.diyaudio.com/forums/pass-labs/97540-f4-power-amplifier-384.html#post3678887
 

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#133
lhquam said:
Here is such a tweak. I have been working on a Blowtorch variant for several months. This is a simplified schematic. You will find more on the F4 thread. http://www.diyaudio.com/forums/pass-labs/97540-f4-power-amplifier-384.html#post3678887
Click to expand...
The variations in both Id and Vds in the output stage MOSFETs do not lend this circuit to low THD; because they are contra to the patent by Threshold's Corp. which taught STASIS; meaning contant current through and constant voltage across the transistor.
 
#136
Antoinel said:
The variations in both Id and Vds in the output stage MOSFETs do not lend this circuit to low THD; because they are contra to the patent by Threshold's Corp. which taught STASIS; meaning contant current through and constant voltage across the transistor.
Click to expand...
This output stage MOSFETs acts as a folded cascode. See the Blowtorch thread http://www.diyaudio.com/forums/solid-state/71189-john-curls-blowtorch-preamplifier.html (good luck wading thru it).

The main differences between the Curllian-F4 and the Blowtorch are:

  • 40 volt peak-to-peak output voltage
  • single ended
Simulation results are extremely encouraging. Initial bench testing show THD levels comparable to the BA-3 front end, perhaps better.
 
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