Soundfield
1K Club - QQ Shooting Star
Oh that story again. Perhaps you could list a few of them.A lot of amplifiers do not like to have open loads on their outputs.
Oh that story again. Perhaps you could list a few of them.A lot of amplifiers do not like to have open loads on their outputs.
Yes indeed. Including the OPPO stuff which many on this site hold up as the very pinnacle of construction quality and reliability.99.9% of today's consumer electronics comes from China, sad but true.
As I recall even the boards for the Surround Master are made in China!Yes indeed. Including the OPPO stuff which many on this site hold up as the very pinnacle of construction quality and reliability.
99.9% of today's consumer electronics comes from China, sad but true.
Oh that story again. Perhaps you could list a few of them.
It's remarkably difficult to design an output stage that behaves that badly. They must have put a lot of effort into it.The amps that failed because the output was open depended on the load to keep the transistors operating properly. When the load disappeared (especially if it suddenly disappeared), the voltage swing in the output transistors reached clipping. This often caused a driver transistor to short due to excess current. This then caused the output transistors to fail in the same way as above.
I've had that type of thing happen, however the overload itself likely caused the output transistor failure to happen first, then the shorted side caused direct current to flow to the speaker causing it to blow. The whole failure would be almost instantaneous.- Carver - I found all of the output transistors shorted on one side of the supply. This was a direct-out amp with 5 output transistors in parallel on each side of a +/-60 volt supply. The speaker was overdriven and had burned out first, and the amp did this with no load.
The People's Republic of China, Taiwan (Republic of China) is no longer recognised as China except by its own government and people.Which China?
"When the load disappeared (especially if it suddenly disappeared), the voltage swing in the output transistors reached clipping. "
Wait, what? The amplitude of the signal in the output stage increased without an increase of input level or change in gain?
That is not consistent with transistor based amplifier operation.
I've had that type of thing happen, however the overload itself likely caused the output transistor failure to happen first, then the shorted side caused direct current to flow to the speaker causing it to blow. The whole failure would be almost instantaneous.
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