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Amplifier power
Arny Krueger wrote: "tony sayer" wrote I Wonder how may pro recording bits of gear are around with 5532's;).. Tons and tons. But 5532s used right are really very good pieces, even by modern standards. And for the price...! And to think they were around in the 1970s too ! And Philips / Signetics initially only thought they were going to sell it into the telecoms market because of the 600 ohm drive ! Philips = NE5532 Signetics ( Philips N.A.) = SE5532 btw. The scarier part is how may pro recording bits of gear are around with TL074s, or even NJM4558s in the signal path. TL07Xs are still ok for some stuff, especially because of the jfet front end but 4558s ? YUCK ! Graham |
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BTW I just paused as I heard that Winter is approaching. The geese are
flying over. So loud that I can hear them though the double-glazing. Nice sound, but sorry to wave farewell to summer... What summer was that then?.. Slainte, Jim -- Tony Sayer |
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In article , Anton Gÿsen
scribeth thus tony sayer wrote: In article , Anton Gÿsen scribeth thus tony sayer wrote: In article s.com, scribeth thus Jim Lesurf wrote: However if your audiolab seems to you not to clip or overheat I doubt you will have a problem with most other = 50Wpc amps in terms of power unless your speakers drop to low impedance. The 8000 series tends to have pokey small heatsinks[1], but can IIRC deliver reasonably high peak currents. Above said, I haven't yet seen you say anything that makes me feel you would benefit from a new amp. Except perhaps in the way of feeling pleased to own and use a newer and - allegedly - 'better' one. Well the phono sockets needed replacing 18 months ago - I'd like an amp with sockets which don't self destruct. Phileas Wonder if that was a poor batch none of mine are duff at all!... I believe it's a common problem with 8000As. Well I've got Four of them and their all fine;!... This site: http://www.theaudiocellar.co.uk/ specialises in, amongst other things, RCA socket replacements for Audiolab 8000As. I can't comment on 8000As because I have a new model 8000S. Interesting to see how the owners of those "Tractors" like to keep 'em going;). Funnily enough we've got four Band 1 transmitters , yes those frequencies are still used, and the cores in one have all disintegrated away whereas in the other their fine all about the same age!.. What is it that fails, the plastic moulding?.. I think so but I'm not sure. I've seen a couple on eBay which have been damaged in transit, so be careful if you ever move yours. -- Tony Sayer |
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In article , Eeyore rabbitsfriendsandrel
scribeth thus tony sayer wrote: Eeyore scribeth thus Robert Orban wrote: says... Seems to be tricky to find anything actually. This mic has a max input SPL of 134dB which receives the comment "Hi-SPL handling is perfect for suspension over choirs and orchestras" http://www.dv247.com/invt/11582/ Try this: Dynamic-Range Requirement for Subjectively Noise-Free Reproduction of Music JAES Volume 30 Issue 7/8 pp. 504-511; August 1982 A dynamic range of up to 118 dB is determined necessary for subjectively noise-free reproeuction of music in an audio recorder with a white-noise floor. Maximum peak sound-pressure levels in music are compared to the minimum discernible level of white noise in a quiet listening situation. Microphone noise limitations, monitoring loudspeaker capabilities, and performance environment noise levels are also considered. Author: Fielder, Louis D. Affiliation: Ampex Corporation, Redwood City, CA Well, I never imagined I'd have Bob Orban backing me up on a technical issue ! Thanks Bob ! Graham Him being the one who will be criticised on other groups for making DAB and FM ever more distorted;!... -- Tony Sayer You can't win 'em all ! No but theres a local station round these parts where the engineer does give a monkeys but the programme controller only knows LOUD LOUD and LOUDER!!! cos the bloke at the other station down the road is the same;; All thinking LOUD is better.. The local community station ****es over all of them for absolute sound quality:)).. Graham -- Tony Sayer |
Amplifier power
On Wed, 15 Oct 2008 19:06:26 +0100, Eeyore
wrote: Arny Krueger wrote: "tony sayer" wrote I Wonder how may pro recording bits of gear are around with 5532's;).. Tons and tons. But 5532s used right are really very good pieces, even by modern standards. And for the price...! And to think they were around in the 1970s too ! And Philips / Signetics initially only thought they were going to sell it into the telecoms market because of the 600 ohm drive ! Philips = NE5532 Signetics ( Philips N.A.) = SE5532 btw. The scarier part is how may pro recording bits of gear are around with TL074s, or even NJM4558s in the signal path. TL07Xs are still ok for some stuff, especially because of the jfet front end but 4558s ? YUCK ! Graham Well, since we're on the subject of IC's, I've dug out my little drawer of IC's left over from my 80's electronics days :-) Can't remember if any of these are op amps, but here are the numbers: LM382N LM380N LM3482A LM741 (pretty sure this is an op amp) M5K4164ANP (ain't a bloody clue what this is) TIP31A ZTX300 (a little 3 pin thing) ZN414 (this is an FM radio on a 3 pin chip) MJE2955 NE555P (loads of these buggers, I know they are timers). Sorry for hijacking this post ;-) Marky P. |
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tony sayer wrote: Eeyore scribeth thus tony sayer wrote: Eeyore scribeth thus tony sayer wrote: Eeyore scribeth thus Did you check the spec of the LME49720 ? http://www.national.com/pf/LM/LME49720.html They had to devise a special method to measure the THD without the noise dominating. They're not even that shockingly expensive. Shockingly enough in small quantities;!... From the likes of Farnell maybe £4 seems a lot but compare that to a $400 woodenvolume control knob ! http://uk.farnell.com/1367613/semico...rs-integrated- circuits/product.us0?sku =national-semiconductor-lme49720ma-nopb&_requestid=131459 That's only £2 per divine op-amp ! What were those $150 ones for then?.. Evaluation boards I think ? Wonder what Doc Martin would have to say;?... You lost me Him of Neve descent, didn't you work together once?.. DOC ? Martin ? I knew a Martin forget his surname who was in R&D. Not Martin (M.H) (Hartley) Jones PhD you mean ? He'd left by the time I arrived. I later did some work for him at Kelvin Hughes radar. Lovely chap. I still talk to him very occasionally. In fact I was just on the point of asking if he'd be happy to be a reference on my CV ! http://www.ibd-uk.com/members/jones-martin.htm Yes thats the one, my next door neighbour. I thought he'd be retiring by now but he's as busy as ever:)... I don't think he wants to stop. And your neighbour too ! What a small world it is. I'd expect he'd give U a reference;).. I damn well hope so after I saved a project there ! Do you see him often ? Say Graham Stevenson sends his regards and let's see if it clicks. Graham |
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On Wed, 15 Oct 2008 20:58:29 +0100, tony sayer
wrote: In article , Eeyore rabbitsfriendsandrel scribeth thus tony sayer wrote: Eeyore scribeth thus Robert Orban wrote: says... Seems to be tricky to find anything actually. This mic has a max input SPL of 134dB which receives the comment "Hi-SPL handling is perfect for suspension over choirs and orchestras" http://www.dv247.com/invt/11582/ Try this: Dynamic-Range Requirement for Subjectively Noise-Free Reproduction of Music JAES Volume 30 Issue 7/8 pp. 504-511; August 1982 A dynamic range of up to 118 dB is determined necessary for subjectively noise-free reproeuction of music in an audio recorder with a white-noise floor. Maximum peak sound-pressure levels in music are compared to the minimum discernible level of white noise in a quiet listening situation. Microphone noise limitations, monitoring loudspeaker capabilities, and performance environment noise levels are also considered. Author: Fielder, Louis D. Affiliation: Ampex Corporation, Redwood City, CA Well, I never imagined I'd have Bob Orban backing me up on a technical issue ! Thanks Bob ! Graham Him being the one who will be criticised on other groups for making DAB and FM ever more distorted;!... -- Tony Sayer You can't win 'em all ! No but theres a local station round these parts where the engineer does give a monkeys but the programme controller only knows LOUD LOUD and LOUDER!!! cos the bloke at the other station down the road is the same;; All thinking LOUD is better.. The local community station ****es over all of them for absolute sound quality:)).. Graham What station's that then? Marky P. |
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tony sayer wrote: Eeyore scribeth thus Thanks Bob ! Graham Him being the one who will be criticised on other groups for making DAB and FM ever more distorted;!... -- Tony Sayer You can't win 'em all ! No but theres a local station round these parts where the engineer does give a monkeys but the programme controller only knows LOUD LOUD and LOUDER!!! cos the bloke at the other station down the road is the same;; All thinking LOUD is better.. The local community station ****es over all of them for absolute sound quality:)).. What's a community station ? :-( For me, radio is all but finished. Apart from Radio 4 of course. It's the same pap from every broadcaster. I can even recall several times changing channel and finding the very same track being played on the new one. Grrrrrrrr. Graham |
Amplifier power
Marky P wrote: Eeyore wrote: Arny Krueger wrote: "tony sayer" wrote I Wonder how may pro recording bits of gear are around with 5532's;).. Tons and tons. But 5532s used right are really very good pieces, even by modern standards. And for the price...! And to think they were around in the 1970s too ! And Philips / Signetics initially only thought they were going to sell it into the telecoms market because of the 600 ohm drive ! Philips = NE5532 Signetics ( Philips N.A.) = SE5532 btw. The scarier part is how may pro recording bits of gear are around with TL074s, or even NJM4558s in the signal path. TL07Xs are still ok for some stuff, especially because of the jfet front end but 4558s ? YUCK ! Graham Well, since we're on the subject of IC's, I've dug out my little drawer of IC's left over from my 80's electronics days :-) Can't remember if any of these are op amps, but here are the numbers: LM382N LM380N Maybe a crappy low power audio amp. LM3482A No idea about the above. LM741 (pretty sure this is an op amp) Pretty lousy one too by today's standards. M5K4164ANP (ain't a bloody clue what this is) Sounds like a Mostek part number. Does it have lots of legs ? TIP31A TO-220 medium power transistor. Forget which polarity. ZTX300 (a little 3 pin thing) Ferranti (now Zetex) small signal npn ? transistor. Their version (E-line) of TO-92. ZN414 (this is an FM radio on a 3 pin chip) For a TRF design. MJE2955 PNP complement of the 2N3055. TO-3 115W 60V device. NE555P (loads of these buggers, I know they are timers). They are. Single timers. Graham |
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