Gary's good tunes 700 build

I'll run some tests on this amp this weekend and get it out Mondayt or Tueday Gary...

Wonderful, I'm REALLY anxious to hear it and have been compiling a playlist. And, looking forward to seeing the performance specs you said you'd enclose.

Did you make a dent in the trout population? Years ago, decades really, an uncle of mine who lived in Coeur d'Alene used to smoke the trout he caught. He'd put about 3 nicely cleaned and de-headed fish in Mason sealers and send us a few jars. It was really, really good stuff, like eating a candy bar!

Speaking of smoking, I read elsewhere in these pages what you posted about vaporising. I've contemplating an electronic cigarette for a while especially since my consumption increased to about 30 per day due to no job to go to. Reading your comments and examining that Vaporleaf site you mentioned made me do a little research and visit a local shop that specializes in such things. I understand now that it is not necessarily for smoking cessation but an alternative nicotine delivery method and it was enlightening to speak to someone with first hand experience of the technology. The person who walked me through the hardware was a young Asian guy in his early twenties who probably never smoked an "analog" cigarette in his life but was a vaping afficianado. He explained that his preferred "at home" method was "dripping" but used one of what I was investigating for when he was out and about and he pointed out the differences between "starter kits'" and separate components. I took advantage of his knowledge and bought the parts for a device to my liking that allows coil voltage and wattage adjustments - dual coils as opposed to a single coil in this case. I had no idea these things could be so sophisticated and that there is a "vaping" culture. I was surprised too to learn that there are those who modify and/or create their own devices - winding their own coils and such things. Reminds me of people who modify audio gear. It's been a week and a half since I've been using this thing and I'm very happy with it's performance. When I first got it, I had 6 or 8 cigarettes left in a pack and so A/B compared them. I found I preferred the electric method and the sensation of inhaling 24mg vapor was similar to actual smoke but without the drawbacks of residual smell, ash and butts. It's very convenient to just have a pull or two on this thing rather than commit to burning an entire cigarette that may mostly smoulder away in an ashtray. Cigarettes are pretty much $10 or more per pack here (50 cents a pop) and for me spending $15 a day, every day is not sustainable - that's a significant percentage of my present income. Reading what you said motivated me to act so thanks for that. It's so far so good and I'm not missing the burning of tobacco. Hope it's likewise with you.
 
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It was all catch and release Gary, but there's a bushel basket worth if trout out there with sore mouths.
Glad to see the e-cig thing worked for you Gary. I haven't smoked a cig in 6 months..
 
Glad to hear that. I thought it was going to be an ordeal not to cave in and buy a pack.

Just to remind you that when it's time to send the amp back, the account number 20848 must be after my name on the shipping label. If not, Package Express in Sumas won't know who it's for and won't e-mail me when it gets there.

I am really looking forward to trying it out!

I may just tidy up my living room for the occasion.
 
Warming up the test gear and the 700 prior to testing....
 

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Good job Jer, residual noise, unweighted , 270 MICRO volts on the left, 350 on the right...EXCELLENT!!
 

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THD & N , left channel, unweighted, 10-80K hz, 10 watts out, 8 ohm load...
 

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I believe those are the lowest THD & N figures on a 700 to date...
 
Frequency Response...
 

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Other measurements, again UNWEIGHTED, 10-80Khz....10 watts out, 8 ohm load, except SNR and Max out...
 

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I can read em Doug....


Will now retest in IEC "A" weighted mode, and I'll darken the scan Doug...
 
[h=2]Audio reproduction and broadcasting equipment[edit][/h]
Although the A-weighting curve, in widespread use for noise measurement, is said to have been based on the 40-phon Fletcher-Munson curve, research in the 1960s demonstrated that determinations of equal-loudness made using pure tones are not directly relevant to our perception of noise.[SUP][3][/SUP] This is because the cochlea in our inner ear analyses sounds in terms of spectral content, each 'hair-cell' responding to a narrow band of frequencies known as a critical band. The high-frequency bands are wider in absolute terms than the low frequency bands, and therefore 'collect' proportionately more power from a noise source. However, when more than one critical band is stimulated, the outputs of the various bands are summed by the brain to produce an impression of loudness. For these reasons equal-loudness curves derived using noise bands show an upwards tilt above 1 kHz and a downward tilt below 1 kHz when compared to the curves derived using pure tones.
This enhanced sensitivity to noise in the region of 6 kHz became particularly apparent in the late 1960s with the introduction of compact cassette recorders and Dolby-B noise reduction. A-weighted noise measurements were found to give misleading results because they did not give sufficient prominence to the 6 kHz region where the noise reduction was having greatest effect, and did not sufficiently attenuate noise around 10 kHz and above (a particular example is with the 19 kHz pilot tone on FM radio systems which, though usually inaudible is not sufficiently attenuated by A-weighting, so that sometimes one piece of equipment would even measure worse than another and yet sound better, because of differing spectral content.
ITU-R 468 noise weighting was therefore developed to more accurately reflect the subjective loudness of all types of noise, as opposed to tones. This curve, which came out of work done by the BBC Research Department, and was standardised by the CCIR and later adopted by many other standards bodies (IEC, BSI) and, as of 2006[SUP][update][/SUP], is maintained by the ITU. It became widely used in Europe, especially in broadcasting, and was adopted by Dolby Laboratories who realised its superior validity for their purposes when measuring noise on film soundtracks and compact cassette systems. Its advantages over A-weighting is less understood in the US, where the use of A-weighting still predominates.[SUP][citation needed][/SUP] It is universally used by broadcasters in Britain, Europe, and former countries of the British Empire such as Australia and South Africa.
Though the noise level of 16-bit audio systems (such as CD players) is commonly quoted as −96 dBFS (relative to full scale), the best 468-weighted results are in the region of −86 dBFS.[SUP][citation [/SUP]
 
THD & N IEC "A" Weighted....maybe you can read this one Doug...
 

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THD & N IEC "A" Weighted, right channel...
 

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IEC "A" Weighted, other measurements....
 

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Self Test Results for the analyzer...
 

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Jani's done with the book...
 

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