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catman

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Everything posted by catman

  1. Has anyone ever experienced 'listening fatigue'? G'day all, this is a very interesting one to me. A few of my audio sources that sound superb to me at the start, end up sounding in the long term, contributing to 'listening fatigue' that in the end makes me feel like not listening to those program sources ever again! Usually they tend to be peaky or bright and yet sound impressive initially but eventually very wearing! It is interesting isn't it? Have others experienced such similar listening 'fatigue'? Regards, Felix.
  2. What is your most valuable/used vinyl record playing accessory? G'day all, with Christmas coming up I was thinking about 'accessories' to enhance 'vinyl record playing'. As it stands, those three items are my block of Magic Eraser, my Zerostat anti static gun and my carbon fibre record cleaning brush. The last two go together! Regards, Felix.
  3. G'day all. Stevoz, I've been banned from there too along with quite a few others some years ago. I was banned for weird and false reasons despite being very highly regarded. When it happened to me I was incredibly hurt, but sadly it happened to a few others there around the same time, so draw your own conclusions! Regards, Felix.
  4. G'day mate, yes indeed some things 'get missed'. Felix.
  5. 'Preloved' records that tell a story! G'day all, As it is now December I have started playing my accumulated collection of Christmas Records many of which are 'preloved'. Yesterday I was playing a recently acquired Goodyear Christmas record (the first I think), and I was quite impressed with the general production and pressing quality. However towards the end of both sides, some inner groove distortion was apparent suggesting that it was previously played with a heavy tracking stylus and/or a poorly aligned tonearm. I wonder. The record was obviously well cared for apart from that. Interesting. Regards, Felix .
  6. The question of 'calibration' and allied accuracy. G'day all, this is a potentially interesting and important question to anyone who dabbles in electronics at all, and relies on any kind of test equipment, even a simple digital multimeter….the question of calibration and allied accuracy. In many cases even reasonable accuracy will be good enough, but not always and I can of think of cases where high calibration accuracy 'is' important, like the speedometer in a car, where accurate speed calibration is important for several obvious and important reasons! Away from things automotive and into the realm of audio electronics, similarly I can think of the same things, like RIAA playback accuracy. Again in some situations that isn't too important in the 'real world', however maybe it is, 'depending'. Please let me try to explain my logic! On my main record playing system I normally use my Rothwell Simplex, a phono stage that I love, however initially I thought that it could sound slightly 'bright', but in any case maybe I've got used to it! The other day I plugged in one of my DIY ESP P06 units and was immediately stuck by the strength of the deep bass of the ESP P06, and the lack of any 'bright' tendency, only utter smoothness right across the audio spectrum! It is interesting as both phono stages are supposed to be calibrated against accurate RIAA references and yes although the ESP P06 has an acknowledged (and documented lower bass boost), at least on the basis of listening, the Rothwell Simplex high frequency calibration is clearly 'suspect', although it sounds good to me! See my point? Calibration is pointless if the calibration is 'out'! Maybe we should turf out every piece of test gear and just solely rely on our ears? Well....no. Good test gear 'should' be calibrated properly! Regards, Felix.
  7. Getting older and your hearing. G'day all, I have a birthday coming up in December (57), and reading on other forums of late I've been wondering if my general hearing and general acuity is as good as it used to be? Last time I checked my treble hearing was good up to 15 or 16 KHz and bass and midrange were fine, and not too bad all things considered. A few years ago my hearing was worsening quite rapidly and my doctor found large chunks of solidified wax in both ears, and clearing them of this wax has made a massive difference! Still I guess general wear and tear has had the inevitable effects, but at 56 going on 57 my hearing is still pretty good! Any comments or thoughts? Regards, Felix.
  8. G'day all, yes I have used a good heatsink on this transistor in the past but whether or not it helped the transistor extend its life before it finally failed, I don't know! Regards, Felix.
  9. G'day mate, well yes several actually, each one praising the 'Simplex'. Regards, Felix.
  10. Performance and price. G'day all, in my mind, at least for DIY, I always strive for 'the best' that I can achieve, however just sitting here tonight I thought about well, regarding commercially made gear, is it logical for something twice the price (or even more), to be 'better' by the same amount? The value for money aspect is valid here, but just in terms of asking price is this a good indication of 'quality'? When I bought my first Rothwell 'Simplex', I did think that it was a little overpriced and in in fact I did tell Andrew Rothwell the same thing! However as of now I do honestly think that the Simplex is worth the price. It is a great phono stage and has 'musicality' in spades! I must really think so as I now have two of them (for different applications). I know that in the end these sorts of evaluations tend to be quite individual and only the individual can make that judgement. Regards. Felix.
  11. 'Open Sounding' phono stages! G'day all, I am constantly wondering about the 'sound signatures' of different phono stage circuits and the like, and in particular so called 'open sounding' phono stages. In the end I think that (based on personal listening and observation), phono stages based on discrete transistor circuitry invariably have a 'open' sound. This is not a condemnation of op amp circuitry as many of these are personal favourites as well, however there seems to be something 'inherent' in discrete transistor circuitry that seems to provide this 'open' sound. Any thoughts or comments? Regards, Felix.
  12. G'day all, as a former Telstra tech myself I also know the importance of a wrist strap with CMOS stuff but as far as I know the NE5534 is not CMOS, and isn't particularly static sensitive! Regards, Felix.
  13. G'day all, I normally purchase from Element 14, but I have used RS at times. I am pretty sure that those NE5534's were purchased from Element 14. Oh well, &%it happens at times! Regards, Felix.
  14. G'day mate, well you are perfectly right but in my general sense of trustfulness, I honestly didn't think that a brand new op amp would be faulty, but obviously I was wrong! Regards, Felix.
  15. G'day mate, I'm starting to lose faith in certain things! I have better things to waste time on, to be completely frank! Regards, Felix.
  16. G'day all, I think that I must be! For the last few days I've been trying to build another simple phono stage using two NE5534 op amps. On power up only channel worked and the other channel was completely dead, and by the way the op amps were brand new and unused straight out of their supplied container. So I thought well I've made a wiring or soldering error, and I spent the next three days looking for it! In the end I needn't have bothered as the cause turned out to be one faulty NE5534 op amp. Simple substitution proved it, and yes by the way I had used high quality 8 pin IC sockets. I think that it is time to give up! Regards, Felix.
  17. James Blunt....You're beautiful. G'day all, that is a really beautiful song alas one that I avoid listening to, because it reminds me of the woman whom I love so much, and my feelings for her. Songs that affect you in a personal way often do it, quite beautiful and painful at the same time. Regards, Felix.
  18. G'day mate, there is a circuit on the ANT website. Regards, Felix.
  19. Serendipity? G'day all, I plugged in my beloved ANT Kora 3T SE the other evening after quite a while, and tried an experiment of sorts. I have never been at all sure about that back panel 'bias' control, well it 'should' do something but I never noticed much change, in all honesty, however when I first got it I didn't think that it 'rocked' as a phono stage, but I loved its sound otherwise but I couldn't recall where the bias control was set when it first arrived. So I set it to one extreme (anti clockwise), and played a record that normally sounds slightly 'brittle', and I was somewhat stunned to note that this record sounded smoother than I expected. More listening will follow, but maybe that bias control does alter the sound quality somewhat, that might be used to 'tune' the sound quality to advantage. Regards, Felix.
  20. Ever wondered about this? G'day all, have you ever wondered how your favourite phono stage ever got designed and in particular about the people who did it? I'm happy to say that I have had some contact with various people who designed some of my favourite phono stages and it has given me some 'interesting' insights. Rod Elliott for example, apart from designing some incredible gear, he is an extremely smart fellow with electronics generally. There is just so much interesting and educational stuff on his website which is a highly recommended read too. He has done a lot with music production and such over the years. That means a lot to me. Similar with Andrew Rothwell too. A very smart fellow, musician and electronics designer, and it shows! His 'Simplex' phono stage is a very clever 'non op amp' design and sounds satisfyingly musical to me. Regards, Felix.
  21. G'day all, again this is not strictly 'hi fi' but it is interesting to me regarding capacitor behaviour. I was getting some reports of hum on one of my Ham Radio transmitters through my DIY microphone preamplifier. Someone suggested putting a capacitor across the supply rail, which I eventually tried. I found a large 2200 uf 50 v electrolytic capacitor in my components parts box, and tried that in the circuit and immediately noticed significant hum reduction, so I properly soldered it in and left it powered up whilst I did something else for an hour or so. I came back a couple of hours later and checked the transmitter audio again and I was stunned to observe that all hum had 'gone'! Did that large electrolytic capacitor need some time to properly 'form' and work optimally? Apparently so! Regards, Felix.
  22. Op amp rolling....a nice combination. G'day all, I've tried this after reading this suggestion regarding another kit phono stage, and trying it in my DIY ESP P06 has worked very well. In my DIY ESP P06 using an OPA2134 in the first stage and an LM4562 in the second 'gain' stage has subjectively made the P06 'much' quieter than ever before! If there are two words to define to sound of the LM4562, they are 'clean' and 'tight'. It certainly makes a very big difference in my DIY ESP P06. Regards, Felix.
  23. Boring or exciting. G'day all, a bit of an ordinary day in a couple of ways (due to unexpectedly high blood glucose today), but interestingly enough a bit of record playing with my DIY ESP P06 reconfirmed one interesting merit that the P06 has. It is a 'dynamic', and even exciting sounding phono stage. I can't actually think of any particular reason why, but listening to it, that is the overwhelming impression that I get, especially after listening to 'lesser', but still good phono stages. Speculating why is difficult, but I suspect that the possibly unusually implemented RIAA passive treble roll off of the P06 'might' be the reason! Whatever the reason, even after all these years the DIY ESP P06 is 'still' an incredible phono stage. I (still) love it. Regards, Felix.
  24. The current drain of typical dual op amps. G'day all, I've needed to do some fault finding on my Akitika phono stage lately which turned out to be several op amps that inexplicably failed (NE5532, NE5534) and whilst doing fault finding I made some observations. The Akitika phono stage does contain quite a few op amps (six in total) and whilst testing it I used one of my small split rail power supplies using LM7815 and LM7915 regulators running without heatsinks on the regulators. With a fairly small/ light load heatsinks on the regulators are unnecessary, however when powering the Akitika phono stage the regulators become quite 'hot' suggesting that six op amps are a substantial current load. I've been told that the OPA2134's draw even greater current that the NE5532's and the like. Interesting! Regards, Felix.
  25. What is your favourite 'every day' phono stage? G'day all, I seem to be getting back into regular daily record playing with the two main systems in this place and it is interesting how acoustics seem to be playing a part. On my lounge room system I have a preference for my Rothwell 'Simplex', but in here (my radio shack system), it still shifts between some of my DIY units with my ESP P06 still getting most use. What do others use routinely? Regards, Felix.
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