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#51
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The disappearance of darkness
On 9/05/2013 11:24 a.m., Alan Browne wrote:
On 2013.05.08 18:52 , Me wrote: No, the precise reason why valve amps are preferred over solid state for electric guitar amplification is not linearity at X% THD level, but the characteristic of distortion when the amplifier is (deliberately) over-driven - past the point of signal clipping. Got it. But I look at amps from the POV of music playback, not point-of-performance. In that sense the sole advantage of a tube amp is the continuous transition. (Class A transistor amps too, I suppose, but they are rather out of vogue). I don't know how well tube amps are wrt to noise these days. I'll have to wander across the street to my richer neighbor and play with his system one day using some good CD's. (And CD is good enough for me). Every time I hear a tube amp I can hear a hum. On Stevie Ray Vaughn's last album, on Little Wing, the hum from the amps is audible. A credit to using the raw recordings, but irritating. Yup - hum is pretty normal and probably exacerbated by high gain setting from the preamp section, as well as (probably) the amps SRV would have used probably would have had "tank" reverbs (old-fashioned springs between two audio transducers - a sender and receiver - still in common use today), and also IIRC SRV played a standard fender strat with single coil pickups (as opposed to dual "humbucker" pickups) and wait there's more - the standard guitar cable and amp input sockets are old style 2 wire (shielded) phono connector with unbalanced signal, even though balanced signal has been pretty much standard (using TRS phono sockets or xlr) for other instrument and microphone signal cables for a long time, with the result being able to do much longer runs of cable, with much less noise. I'm using a small "tri-amped" active speaker system as a home hifi system ATM. In this case, class D for subs and main drivers, class AB amps for the HF drivers, connected through a small mixer by balanced XLR. It is phenomenally loud in a domestic setting, "only" about 2000 watts, but claimed maximum SPL is approaching 130dB at 1 metre. At full volume (only ever used for demo purposes and to /really/ get the neighbours upset G) There's no hum I can hear, but a very faint hiss which isn't coming from the power amp circuits but the mixer (if I turn the master gain down, then the hiss disappears). Unlike old-style small PAs, it sounds excellent at lower volume and the close listening distances in a typical house. I put most of this down to DSP, with digital x-over at a very high 28dB/octave, built in digital delay between drivers to avoid phase difference issues, and pre-set DSP correction of spectral non-linearity of speaker response. This is not high-end, but relatively middle of the road equipment (Mackie), in the same sort of market as JBL etc. It is however pretty ugly and industrial. It is also a "hifi purist's" worst nightmare - especially those who believe that small low powered amps can faithfully reproduce rock music - as it was meant to be heard. |
#52
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The disappearance of darkness
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#53
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The disappearance of darkness
On 5/8/2013 3:51 PM, R. Mark Clayton wrote:
"Me" wrote in message ... On 8/05/2013 10:16 p.m., R. Mark Clayton wrote: "Alan Browne" wrote in message ... On 2013.05.07 16:25 , Me wrote: On 8/05/2013 1:02 a.m., R. Mark Clayton wrote: There might be a bit of nostalgia for vinyl records and even some misplaces preference for valve amps, but I doubt many other than Kodak will mourn the passing of wet film. Some of the preference for valve amps isn't misplaced. They're still the standard for some instrument amplification (guitars). There's also a parallel there with film/digital photography, as digital sond processing is used in sound-processing in so-called "modelling amps" (solid state) to replicate the "tone" (non-linear response) of valve amps. It's a bit like using a "velvia" filter in photoshop etc, to replicate the look of film. The sole advantage tube amps have over transistors is the continuous smooth transition of -ve to +ve voltages through the signal range whereas transistors have a discontinuity near 0 volts (for both the "push" transistor (+ve side) and "pull" (-ve side) of the output in a class B amplifier). Doh! you normally bias transistors, so it doesn't go -10V to +10V, but +5V to +25V. Valve amps do demonstate tonality and high [thermal] noise. Transistors were adopted in amps (and much else) because they outperformed valves on linearity / distortion, frequency response, reliability, noise, size, energy consumption and last but by no means least cost. Example - a basic EF81 (AF valve) was over £1 retail in 1973, when they were still in mass production - that is about £11 ($16) today. Even now an equivalent transistor would cost less than a dollar and out perform it in every way. Some still are in mass production - perhaps just not in the kind of volume as 50 years ago, ie: http://www.jj-electronic.com/ There are also makers in Russia and China. No doubt - quite a good design IIRC. It's moved on a bit recently too, with class D amps setting efficiency standards, increased efficiency means less heat, smaller size. For large concert PA systems - this type of audio amp may be used these days: http://www.powersoft-audio.com/en/pr...eries/k20.html 2 x 9000w in a small rack mount unit, 12kg weight. (but you can almost guarantee that the guitarist will still be using his valve amp, miked in to the PA) My partner worried when I bought a Sony AV amp (7x100W) - note sure what she would make of 18kW! I didn't know I had such pretensions. And I don't know what you mean by inferior technology. -- PeterN |
#54
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The disappearance of darkness
On 5/8/2013 4:05 PM, R. Mark Clayton wrote:
"PeterN" wrote in message ... On 5/8/2013 2:33 PM, nospam wrote: In article , PeterN wrote: SNIP the kodachrome look or velvia look can be done in software. grainy b/w films can be done in software. whatever film you prefer can be done in software. Stop shape shifting. You said: "the only people who prefer film are those who refuse to accept new technology." I called you on it. Now when do you want to meet real people who do not fit your classification. Peter is basically right. There may be a few niches left for film (X-rays for instance, but even then...), but essentially almost all who still use film do so because they are set in their ways or they have not got around to buying new equipment yet. Again, when I was a kid in the sixties I used to be able to tell which pictures in National Geographic were Kodachrome and which Ektachrome just by looking and this was after process colour printing. Even with the highest standards of professional shooting and production there was a big colour cast on both (slate grey / blue on the former; orangy red on the latter). Sure film has improved since then, but has now been completely overhauled by digital. I seem to recall Ecktachrome as haveing the blueish cast, and Kodachrome as being warmer. For that reason, and its higher ASA, I used Ektachrome for my underwater photography. Similarly in the late 1980's I could tell when Signal Radio was playing CD's by ear as I drove along the M6 because the sound quality was so much better. This was despite the fact that Signal obviously had top quality vinyl decks, it had a radio segment and was playing in my relatively noisy car. On my home system it is easy to forget and leave the amp is on because the noise level is so low with no signal you just can't hear it. There would be [intrusive] audible hiss from a valve amp. People who think vinyl is better than CD, valves amps are better than transistor and since fairly recently film is better than digital are just deluding themselves. These are the same suckers who buy silver speaker leads and $100+ [even digital] interconnects... that is the sole issue. -- PeterN -- PeterN |
#55
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The disappearance of darkness
On 5/8/2013 5:02 PM, nospam wrote:
In article , PeterN wrote: the only people who prefer film are those who refuse to accept new technology. I would be happy to introduce you to some who would easily demonstrate the gross inaccuracy of your statement. go for it. i would be happy to convince them of their mistaken beliefs. there is absolutely nothing inaccurate about my statement. it can be proven. it is not a matter of opinion. When will you be in New York. Or perhaps Downeast in Maine? BTW Your statement was "the only people who prefer film are those who refuse to accept new technology." When you let me know who you are and when you are available, I will make a proper introduction. digital is better than film and has been for many years, and as time goes on, the difference will get bigger. digital has higher resolution, higher dynamic range, more accurate colour, usable at *much* higher isos, more consistent (no variation batch to batch), does not expire and does not need to be kept cold. it's also cheaper per photo and no need for noxious chemicals to get results. Not the issue - see above it's *exactly* the issue. the film luddites think there's something magical about film. there is not. all of its characteristics can be modeled digitally, whatever film it happens to be. the kodachrome look or velvia look can be done in software. grainy b/w films can be done in software. whatever film you prefer can be done in software. Stop shape shifting. You said: "the only people who prefer film are those who refuse to accept new technology." I called you on it. you did not call me on anything nor am i shape shifting. Now when do you want to meet real people who do not fit your classification. i have no immediate plans to go to new york. maybe photo plus next fall. Naturally, your statement would be proven wrong. that is the sole issue. your inability to understand basic english is the issue, along with being an argumentative twit. That's typical of you. When proven wrong you shift to name calling. BTW by most standards, the word "most" has a very well understood and BASIC meaning. -- PeterN |
#56
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The disappearance of darkness
On 5/8/2013 6:01 PM, Tony Cooper wrote:
On Wed, 08 May 2013 14:14:44 -0400, PeterN wrote: On 5/8/2013 1:10 PM, nospam wrote: In article , PeterN snip the only people who prefer film are those who refuse to accept new technology. I would be happy to introduce you to some who would easily demonstrate the gross inaccuracy of your statement. go for it. i would be happy to convince them of their mistaken beliefs. there is absolutely nothing inaccurate about my statement. it can be proven. it is not a matter of opinion. When will you be in New York. Or perhaps Downeast in Maine? BTW Your statement was "the only people who prefer film are those who refuse to accept new technology." When you let me know who you are and when you are available, I will make a proper introduction. digital is better than film and has been for many years, and as time goes on, the difference will get bigger. digital has higher resolution, higher dynamic range, more accurate colour, usable at *much* higher isos, more consistent (no variation batch to batch), does not expire and does not need to be kept cold. it's also cheaper per photo and no need for noxious chemicals to get results. Not the issue - see above Typical of nospam not to understand that the preference is based on the process and not the result. He must think that a woodworker who lovingly makes a table in his workshop is someone who refuses to accept new technology because he won't buy a mass produced table from Rooms To Go. Wow you just hit a chord. I once made a hand inlaid chess table, out of birch and maple. It took months. When my daughter was in grade school, she wanted to play the cello. After renting one for the first year, I picked up an old beat up cello that had been carelessly covered with shellac, for $5. We spent a summer stripping the instrument to bare wood, staining it, and hand finishing it with violin varnish. Her music teacher commented that it was rare to see a beginning student playing such a fine instrument, and that it was worth over a thousand dollars. My original reason was so that my daughter would help finish the instrument, therby having an investment in it. She kept her interest for about seven years. But, I guess nospam would prefer a machine made Chinese instrument. -- PeterN |
#57
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The disappearance of darkness
On 2013-05-08 21:15:54 -0700, PeterN said:
BTW by most standards, the word "most" has a very well understood and BASIC meaning. Yup! More than "some" less than "all". -- Regards, Savageduck |
#58
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The disappearance of darkness
In article , Doug McDonald
wrote: the film luddites think there's something magical about film. there is not. all of its characteristics can be modeled digitally, whatever film it happens to be. the kodachrome look or velvia look can be done in software. grainy b/w films can be done in software. whatever film you prefer can be done in software. You may be right about film. I won't argue. But I will about B&W prints. There as aspects of silver ... not to even include platinum or palladium or gold ... that cannot be duplicated. Certain types of papers have reflection characteristics that cannot be duplicated without metals in the emulsion. Of course, digital images can be printed on those papers. print the digital image on silver based paper, as you mentioned. in fact, that's what photofinishing shops do. the negatives are scanned and then digitally printed on photo paper. don't tell the film luddites though. they'll probably have a fit. |
#59
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The disappearance of darkness
In article , PeterN
wrote: the only people who prefer film are those who refuse to accept new technology. I would be happy to introduce you to some who would easily demonstrate the gross inaccuracy of your statement. go for it. i would be happy to convince them of their mistaken beliefs. there is absolutely nothing inaccurate about my statement. it can be proven. it is not a matter of opinion. When will you be in New York. Or perhaps Downeast in Maine? BTW Your statement was "the only people who prefer film are those who refuse to accept new technology." When you let me know who you are and when you are available, I will make a proper introduction. digital is better than film and has been for many years, and as time goes on, the difference will get bigger. digital has higher resolution, higher dynamic range, more accurate colour, usable at *much* higher isos, more consistent (no variation batch to batch), does not expire and does not need to be kept cold. it's also cheaper per photo and no need for noxious chemicals to get results. Not the issue - see above it's *exactly* the issue. the film luddites think there's something magical about film. there is not. all of its characteristics can be modeled digitally, whatever film it happens to be. the kodachrome look or velvia look can be done in software. grainy b/w films can be done in software. whatever film you prefer can be done in software. Stop shape shifting. You said: "the only people who prefer film are those who refuse to accept new technology." I called you on it. you did not call me on anything nor am i shape shifting. Now when do you want to meet real people who do not fit your classification. i have no immediate plans to go to new york. maybe photo plus next fall. Naturally, your statement would be proven wrong. that would be quite the feat, because for it to be wrong, everything we know about sampling theory, semiconductor physics and electrical engineering would be invalidated. nevertheless, if your buddy really thinks he can prove it, then best he take that proof to mit. it's an easy drive from new york. that is the sole issue. your inability to understand basic english is the issue, along with being an argumentative twit. That's typical of you. When proven wrong you shift to name calling. you haven't proven me wrong and you are talking out your ass. |
#60
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The disappearance of darkness
In article , R. Mark Clayton
wrote: Indeed one of the more sensible Hi-Fi mags tested regular mains cable against a group of expensive speaker cables. Virtually no difference. I did use [cheap] chunky speaker cable for my mains, but at full pelt they can be carrying quite a lot of current (10A+). i got my speaker cable at a hardware store. 14 gauge wire is 14 gauge wire. there's nothing special about 'audiophile cable.' it's the same stuff, but with a nicer looking insulation and a significantly higher price. |
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