sfogg Posted November 29, 2005 Share Posted November 29, 2005 This is an amp I have been meaning to test for awhile... This is the 100kHz square wave response... Quote Link to comment Share on other sites More sharing options...
sfogg Posted November 29, 2005 Author Share Posted November 29, 2005 40kHz square wave response... Quote Link to comment Share on other sites More sharing options...
sfogg Posted November 29, 2005 Author Share Posted November 29, 2005 20kHz... Quote Link to comment Share on other sites More sharing options...
sfogg Posted November 29, 2005 Author Share Posted November 29, 2005 10kHz... (all these are at 1 w into 8 ohms BTW) Quote Link to comment Share on other sites More sharing options...
sfogg Posted November 29, 2005 Author Share Posted November 29, 2005 5kHz... Quote Link to comment Share on other sites More sharing options...
sfogg Posted November 29, 2005 Author Share Posted November 29, 2005 ....skipping *way* down to see when/if square waves don't look good anymore... this is the 1hz square wave response. Harder to photograph these since the wave takes a second to draw on the scope. Quote Link to comment Share on other sites More sharing options...
ben. Posted November 29, 2005 Share Posted November 29, 2005 Oooh! I know! I know!! Quote Link to comment Share on other sites More sharing options...
sfogg Posted November 29, 2005 Author Share Posted November 29, 2005 50hz sine wave distortion test at slightly under .1w into 8 ohms... Quote Link to comment Share on other sites More sharing options...
sfogg Posted November 29, 2005 Author Share Posted November 29, 2005 50hz at about 1w... Quote Link to comment Share on other sites More sharing options...
sfogg Posted November 29, 2005 Author Share Posted November 29, 2005 50hz at about 21w... Quote Link to comment Share on other sites More sharing options...
sfogg Posted November 29, 2005 Author Share Posted November 29, 2005 Sine wave on the scope at 21w Quote Link to comment Share on other sites More sharing options...
sfogg Posted November 29, 2005 Author Share Posted November 29, 2005 50hz at just slightly more power then the 21w measurement above... below 22w... Quote Link to comment Share on other sites More sharing options...
sfogg Posted November 29, 2005 Author Share Posted November 29, 2005 What that looks like on the scope.... It isn't harmonic distortion... more like large amount of noise getting added to the signal. Note the peaks aren't clipping, at least not in the normal sense. Shawn Quote Link to comment Share on other sites More sharing options...
ben. Posted November 29, 2005 Share Posted November 29, 2005 Wow. That's really interesting what's going on between 21W and 22W at 50Hz! Quote Link to comment Share on other sites More sharing options...
sfogg Posted November 29, 2005 Author Share Posted November 29, 2005 Ben, Yup, up to 21w the amp is very clean. Right above that point it gets nasty quick with all that noise jumping into the output. Shawn Quote Link to comment Share on other sites More sharing options...
Deang Posted November 30, 2005 Share Posted November 30, 2005 Not bad for a $100 amp. Doesn't look any worse than most SET amps. Quote Link to comment Share on other sites More sharing options...
Piranha Posted November 30, 2005 Share Posted November 30, 2005 I am curious to see what NOSValves thinks [] Quote Link to comment Share on other sites More sharing options...
DrWho Posted November 30, 2005 Share Posted November 30, 2005 So what amp is it? And what do the HF response plots look like at 20W? Quote Link to comment Share on other sites More sharing options...
Duke Spinner Posted November 30, 2005 Share Posted November 30, 2005 I don't know, Shawn ...... my speakers won't reproduce 100 Khz .....[:^)] Quote Link to comment Share on other sites More sharing options...
sfogg Posted November 30, 2005 Author Share Posted November 30, 2005 Dean, I didn't say how much this amp costs. As a hint though a digital amp wouldn't have that kind of square wave response up high because of the low pass filtering in a digital amps output stage. "Doesn't look any worse than most SET amps. " Up to 21w it looks pretty much better on these tests then any other amp I have tested... tube or SS. A typical tube amp wouldn't have that sort of HF or LF response either. Shawn Quote Link to comment Share on other sites More sharing options...
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