The Monkey
Monkey See, Monkey DAC
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Are the chassis feet for spikes?
ß22 + σ22 design complete ••• Opinions welcome
- Thread starter IPodPJ
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Monkey See, Monkey DAC
The Monkey
Monkey See, Monkey DAC
A really sick dud
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Quote:
I was actually going to suggest that! Well, without the fancy words, just deeper into Class A. I've learned something!
| Originally Posted by Beefy /img/forum/go_quote.gif Just increase the quiescent current; deeper into class A. |
I was actually going to suggest that! Well, without the fancy words, just deeper into Class A. I've learned something!
luvdunhill
Headphoneus Supremus
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Quote:
yay! now onto gate capacitance!
| Originally Posted by The Monkey /img/forum/go_quote.gif I was actually going to suggest that! Well, without the fancy words, just deeper into Class A. I've learned something! |
yay! now onto gate capacitance!
IPodPJ
MOT: Bellatone Audio
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Quote:
That's up to Steve. If it's easy enough to do and won't hinder our internal layout in any way, I'm sure he could.
| Originally Posted by n_maher /img/forum/go_quote.gif I guess my point is that it would seem trivial (compared to the work invested so far) to simply make use of the heat sinks now. |
That's up to Steve. If it's easy enough to do and won't hinder our internal layout in any way, I'm sure he could.
IPodPJ
MOT: Bellatone Audio
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Quote:
No. They look just like they do in my illustration. The pictures you are seeing is the bottom of the foot. They will be screwed into the chassis, and then a circular felt pad will be put into the depression.
| Originally Posted by The Monkey /img/forum/go_quote.gif Are the chassis feet for spikes? |
No. They look just like they do in my illustration. The pictures you are seeing is the bottom of the foot. They will be screwed into the chassis, and then a circular felt pad will be put into the depression.
Beefy
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Quote:
I thought gate capacitance was why cascoding is such a useful design choice?
| Originally Posted by luvdunhill /img/forum/go_quote.gif yay! now onto gate capacitance! |
I thought gate capacitance was why cascoding is such a useful design choice?
Steve Eddy
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Quote:
It's already running at 160mA. Into 300 ohms, that's over 8 watts. Even into 32 ohms it's nearly 1 watt.
Don't think there's much out there that would ever take it out of class A.
se
| Originally Posted by Beefy /img/forum/go_quote.gif Just increase the quiescent current; deeper into class A. |
It's already running at 160mA. Into 300 ohms, that's over 8 watts. Even into 32 ohms it's nearly 1 watt.
Don't think there's much out there that would ever take it out of class A.
se
Beefy
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Oh, absolutely. But Monkey asked, I answered.
Still, many people claim that for these MOSFETs, having a higher bias increases linearity and decreases distortion.
| Originally Posted by Koyaan I. Sqatsi /img/forum/go_quote.gif It's already running at 160mA. Into 300 ohms, that's over 8 watts. Even into 32 ohms it's nearly 1 watt. Don't think there's much out there that would ever take it out of class A. |
Oh, absolutely. But Monkey asked, I answered.
Still, many people claim that for these MOSFETs, having a higher bias increases linearity and decreases distortion.
luvdunhill
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arc welding?
| Originally Posted by Koyaan I. Sqatsi /img/forum/go_quote.gif Don't think there's much out there that would ever take it out of class A |
arc welding?
luvdunhill
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The function of the output stage cascode is to create a constant voltage across the output device at all costs. It is the Vas stage job to drive the gate capacitance of the output stage, which can get hairy due to non linearities in gate capacitance. The choice of how to do this seems to have a important impact on design as a whole. Perhaps not as much as the chassis design, but still some.
IPodPJ
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Quote:
If it puts 8 watts into 300 ohms (I thought it was 6W though), wouldn't it be higher than 1 watt at 32 ohms if the amp is capable of 50W at 8 ohms (if we had configured it that way and used bigger heatsinks and higher VA trafos)?
| Originally Posted by Koyaan I. Sqatsi /img/forum/go_quote.gif It's already running at 160mA. Into 300 ohms, that's over 8 watts. Even into 32 ohms it's nearly 1 watt. Don't think there's much out there that would ever take it out of class A. se |
If it puts 8 watts into 300 ohms (I thought it was 6W though), wouldn't it be higher than 1 watt at 32 ohms if the amp is capable of 50W at 8 ohms (if we had configured it that way and used bigger heatsinks and higher VA trafos)?
Steve Eddy
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Even at 160mA, it's spec'd at around 0.001% into 33 ohms.
Do we really need to go back to the spec wars of the 70's?
se
| Originally Posted by Beefy /img/forum/go_quote.gif Still, many people claim that for these MOSFETs, having a higher bias increases linearity and decreases distortion. |
Even at 160mA, it's spec'd at around 0.001% into 33 ohms.
Do we really need to go back to the spec wars of the 70's?
se
Steve Eddy
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Remember when Audio magazine took a big Levinson amp and fed it a 1kHz sinewave and used it to arc weld two pieces of metal together?
se
| Originally Posted by luvdunhill /img/forum/go_quote.gif arc welding? |
Remember when Audio magazine took a big Levinson amp and fed it a 1kHz sinewave and used it to arc weld two pieces of metal together?
se
Steve Eddy
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Quote:
I was basing it on the output stage bias current.
se
| Originally Posted by IPodPJ /img/forum/go_quote.gif If it puts 8 watts into 300 ohms (I thought it was 6W though), wouldn't it be higher than 1 watt at 32 ohms if the amp is capable of 50W at 8 ohms (if we had configured it that way and used bigger heatsinks and higher VA trafos)? |
I was basing it on the output stage bias current.
se
luvdunhill
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Quote:
I love that story. Even cooler perhaps is the fact that there was a Crown model that was actually used for welding for some aerospace application..
| Originally Posted by Koyaan I. Sqatsi /img/forum/go_quote.gif
Remember when Audio magazine took a big Levinson amp and fed it a 1kHz sinewave and used it to arc weld two pieces of metal together? se |
I love that story. Even cooler perhaps is the fact that there was a Crown model that was actually used for welding for some aerospace application..
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