Another little question while on the subject. Long time since I was at college but I remember THD as being third harmonic distortion. When I looked it up on the net it came back as total harmonic distortion. Have I been drinking too much?
I always took THD as total harmonic distortion. I can't imagine why anyone would be interested particularly in the distortion caused by the third harmonic, unless you were creating a Hammond organ or such.
The other feature of some of those power amps of the ratings wars of the '70s was "instantaneous power". The power supply was underrated for the peak load, so as soon as the (smallish) supply caps sagged after a few msec, the output would clip. But they got lots-o-watts for the first couple of cycles of output! I wouldn't be surprised if guitar amp makers got caught up by this craze as well,
Best regards,
Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis
This isnt really "instantaneous power", its "average transient power" during those ms.
RMS power really means "average power over a cycle". "Instantaneous power", is the single instant VI product, that dont really mean much. "Instantaneous power", would be the power at *max VI*, not average of the cycle, and would normally be specified under *steady state* conditions *after* the supply had sagged!!!
I doubt that many manufactures specified max power by a burst sine test.
Yeah, this is all a bit confusing aint it. "Instantaneous power" isn't, and "average power" isn't necessarily long term average power, it might be only the average power during the first few ms.
Which is all that is required for clean guitar picks.
As I explained in another post, capacitor size/cost can make this effect automatic.
Kevin Aylward snipped-for-privacy@anasoft.co.uk
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