Switching power supplies are getting more popular in the hifii crowd: How to get totally Misinformed about High End Audio - YouTube
Model 625 S2 – Jeff Rowland Design Group
"High-Efficiency Switch-Mode Power Supply
Highly efficient, compact, light weight, 1500 watt DC switch-mode power supply provides optimum voltage regulation for all circuits and operating conditions, and allows for quiet operation over a wide range of AC mains power sources."
The amplifier with a switching power supply, mentioned in the OCD hifi guys rant.
"High-Efficiency Switch-Mode Power Supply
Highly efficient, compact, light weight, 1500 watt DC switch-mode power supply provides optimum voltage regulation for all circuits and operating conditions, and allows for quiet operation over a wide range of AC mains power sources."
The amplifier with a switching power supply, mentioned in the OCD hifi guys rant.
N-VFet 183 warming a bit before hook-up.
At idle the vfets are running at about 71C and the mosfets at about 58C.
A fun build, and I think that the case is a work of art.
I'll share some impressions when I have listened for a while.
Many thanks again to all involved for this outstanding
amplifier.
At idle the vfets are running at about 71C and the mosfets at about 58C.
A fun build, and I think that the case is a work of art.
I'll share some impressions when I have listened for a while.
Many thanks again to all involved for this outstanding
amplifier.
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You need to put a piece of black electrical tape on the vfet case,let it heat up and re measure.Your emissivity may not be set right (if it can even be adjusted) as you are measuring a shiny surface.41C is way low,should be around 70C.Maybe your thermo is even defective?
In regards to the bias of 14 volts. How fast does this voltage reach 14 for everyone? Mine starts out at 7 and creeps up to 14 after about 30 seconds.
I just put together and biased #138 but I'm getting what I think is a 120 Hz hum when I attach interconnects. If I touch the metal of the amp the hum goes away. Also there is no hum when no interconnects are attached or I short the inputs.
I attached a lead to the DC input jack shell to ground to the chassis but it doesn't seem to make any difference whether it's attached or not. If I touch that lead when unattached, the hum goes away.
The behavior is the same in both channels. Any help would be appreciated.
I attached a lead to the DC input jack shell to ground to the chassis but it doesn't seem to make any difference whether it's attached or not. If I touch that lead when unattached, the hum goes away.
The behavior is the same in both channels. Any help would be appreciated.
Attachments
I just discovered that turning off my fluorescent desk lamp reduces the hum while plugging the amp in to a different outlet increases it again.
Damn. Misread when I ordered. Is 0.25W resistors okay instead of 0.4W resistors? Got CMF 50 and RN60.
https://www.vishay.com/docs/31018/cmfind.pdf
https://www.vishay.com/docs/31027/cmfmil.pdf
https://www.vishay.com/docs/31018/cmfind.pdf
https://www.vishay.com/docs/31027/cmfmil.pdf
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