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andyr

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andyr last won the day on April 30 2016

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  1. Haha! Most people who use tube gear think that a (ss) head amp is the devil's work! Andy
  2. I suggest there are several options for a SUT. Apheta 3 specs say it has 0.35mV output - so you ideally need a 1:15 SUT ... which will increase the carts output to 5.25mV. A 1:20 SUT may be better - which raises the cart output to 7mV - as the specs I read for the Leben RS-30EQ phono stage said it has rather a low gain (so a higher than normal input signal would be a good thing). The only problem with the above is that a 1:20 SUT delivers a loading to the cart of 118 ohms. (Yes, the Apheta's specs say 100 ohms load - but this is generally the minimum advised ... so a higher value will make it sound better.) So a head amp may be a better option (as you can have high gain independent of cart loading). @buzz lightyearmay have a SUT for sale (as he's just bought a head amp ). Andy
  3. Thanks, John. Hi t - I see you're in Melbourne ... I could drop one over for you to try out. (Hah! Providing I don't have to drive into - or through - one of the 10 'locked-down' postcodes. ) As John, suggested ... it could be a mechanical issue with the power transformer: in which case, tightening up the nut on the traffo bolt should fix it. unless the traffo used to be fixed firm with a potting mixture ... which is breaking down (very unlikely!). Or it's DC on the line which is causing the buzz - in which case a DC blocker should fix this. Do you have solar electricity panels on your roof? Please send me a PM, if you're interested and we can organise the loan. Regards, Andy
  4. Welcome, Mos - there are a few Maggie owners within the SNA community. Which ones do you have - and what are you driving them with? (I have a hybrid which I made by combining drivers from 2 different (old) models - then had them refurbished by Bill. So they're basically IIIas with the mid panel on a separate sheet of mylar to the bass panel.) Andy
  5. Yes, the burl in that plinth is great! And I prefer the colour, too. Good luck with finding a 12" arm for it. Andy
  6. Great slab of wood there, OLLY. Yes, I agree - a 12" arm would look much better. Andy
  7. I think you'll find all powerboards, these days, have some sort of filter in them. Andy
  8. For the last 10 years or so. NAC12s (heavily modified) with an AKSA 55 (which killed my NAP 250, when I compared them). No (thank goodness)! However, I would have to say that early Naim preamps deliberately have a limited HF response - so they don't go much higher than 30kHz. They were built this way to stop Naim power amps from become unstable at HFs - all my 12s does to my AKSA 55 ... is limit its bandwidth. You've been drinking too much Naim KoolAid! That, you can certainly get. But whether the NordOne delivers this ... I have no idea. There are many amps that you could use, apart from a Hypex-based Nord One amp. But they would probably cost more. That being said, your NAC62 will probably 'shape' any amp's HF extension. Andy
  9. Are you saying, RW, that changes in your mains voltage ... cause changes in the DC offset you can measure at your power amp's spkr terminals? If so - is this your Soraya amps ... or your Holton? Andy
  10. But the DC voltage coming out of the power supplies used with the motor speed controller is not fluctuating - particularly in the case of the battery PS. I agree that power conditioning on an AC power feed to a motor speed controller should make the AC smoother - which could well result in better W & F numbers. Better W & F would certainly make sustained piano notes sound better ... but would it lead to the SQ improvements that we heard: we could 'hear the room' better (the church the recording was made in) the decay of the vocals was longer lasting? Andy
  11. Correct, v. But the question here is ... how does changing the DC power supply driving an AC motor speed controller, cause W & F to be reduced? Andy
  12. We were playing an LP of Vivaldi's "Gloria". SQ improvements were: we could 'hear the room' better (the church the recording was made in). the decay of the vocals was longer lasting. My opinion of what caused these improvements? I have no idea - it simply shows that different power supplies have an effect on the sound - even though these power supplies are merely driving a TT motor. As does adding some isolation and filtering on the mains supply. Is this due to reduced wow & flutter? I wouldn't have thought so (we should played a piano recording.) Andy
  13. Yes, it's certainly less obvious that "doing something " to the mains power feeding a PS that is driving a TT ... will have an effect on the sound coming from the speakers - compared to "doing something " to the mains power feeding a component that processes the music signal. But you might be interested in the results of an experiment I did about 6 years ago, when I first got my 'Number9' AC motor controller. This is on a belt-drive TT. The 'Number9' AC motor controller comes with a 48v Meanwell SMPSU; I - and my 'golden-eared' panel - compared the sound we heard when the Meanwell was replaced by some other PSes: firstly, a linear PSU. and secondly, 4x 12v SLAs, stacked - with another 4 in parallel, to decrease the Zput of the battery supply. We then tried the SMPSU and the linear PSU with an isolating transformer+hash filter between them and the wall socket. The SQ was unanimously agreed as (in increasing SQ order): SMPSU linear PSU SLAs linear PSU with isotran+hash filter SMPSU with isotran+hash filter. Andy
  14. Haha - truly a 'First World Problem"! Andy
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