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Post by ChrisB on Nov 30, 2015 0:15:20 GMT
Eek indeed!
I'm sure some information on how to know if the BMU might be best suited to anyone's particuilar needs would be useful, as this is a new area for a lot of people.
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Post by MartinT on Nov 30, 2015 4:57:17 GMT
Thanks for the reply, I'm aware that the rating calculation is complex. My P10 helps with understanding system power consumption. It idles at just over 100W and only peaks to about 400W when I'm seriously driving it. The 1000VA BMU will be fine, I agree.
Dave, I finally sold the Chord when I trialled something even better and am now a very happy owner of a Belles SA-100 (see my avatar).
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Post by dsjr on Nov 30, 2015 7:54:54 GMT
 Although I don't just want to be a mouthpiece for NVA, may I pass this on, which I received last night , I'm sure for this purpose.. "Safety trips - It is built to Class II double insulated appliance regs so is quite safe as nothing can ever get to the case. It is only Class I metal cased and fused units that need all that gubbins. There is earth continuity through the unit so any voltage drain to earth from either + or – legs on anything connected to it will take out the consumer unit fuse or trip, it doesn’t need a separate one en.wikipedia.org/wiki/Appliance_classes A transformer circuit (which is what a BMU is) is rated in VA (volt/amps) which is a movable feast according to how and why the transformer is made and the parameters the manufacturer sets for HIS VA rating. VA rating as a specification is not fixed as there are variables. Basically it is what temperature you allow the coils to reach and how long it takes the coils to reach that temp. A conservatively rated 1000va transformer could be rated as 2000va at the point of self destruct, there is that much variation. AND because it is a temperature related spec how the transformer coils are ventilated can make you think you have a better transformer than you really have. It is the thickness and quality of the wire coils and the quality of the winding process that dictate good transformers not some pulled from the air VA figure. On top of that the quality and thickness of the iron or steel plate in the core. So I have no accurate fixed answer for you, all I can tell you is the BMU transformer is a conservatively rated 1000va by the manufacturer but that is obviously not the whole story. Other manufacturers could rate it at 1500va or at extreme and still be quoting an accepted variance of the spec at 2000va. So pretty pointless question I am afraid. The reason some people ask is they add up the quoted va ratings of all their systems transformers and say "I need this" which is caused by lack of understanding, well you don't. The NVA BMU will completely effectively supply ANY hi-fi system that is made today, be it valve or transistor. Paul Messenger has a few thousand VA as well and uses just one of my units for the whole lot. NVA Not 500va Dave." |
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Post by dvh on Nov 30, 2015 11:12:16 GMT
I can recommend LS6, having tried it. Good cable. I enthusiastically endorse this recommendation. |
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Post by pre65 on Nov 30, 2015 15:35:30 GMT
I made my own BMU using a 1000va transformer.
Initially I thought it was better connecting everything except the power amps, but blind testing it when a like minded friend came round, neither of us could tell any differences.
I will say that I think my mains is clean, living as I do in a rural community. Those with polluted mains may well find differently.
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Post by dsjr on Nov 30, 2015 16:24:20 GMT
Living on the Suffolk coast as we do, I think our mains is pretty good on the whole (the Docks have their own generators I believe, so unlikely they pollute our mains...). I use ferrite clips as a matter of course and these really did make a difference when we lived in Luton, each additional one making a smaller perceived difference, although I still felt it was reversible. They're cheap enough so I left them there and still use them on the IT equipment/laptop supplies/TV etc., as well as on some of the audio bits. As far as my BMU is concerned, I feel the 'difference' is small, but it sort of creeps up on you - I found the TIS interconnect did the same. Not a 'night and day' kind of difference, but one which I missed when I removed them from circuit. In the end, I pined for them so much when they weren't there, I bought them both and have used them ever since, along with SSC's in the NVA system (Klotz MC5000 and MG HD1500's elsewhere).
Pre (I forget your name sir, sorry), I believe your amps are something to behold, with absolutely humungous transformers I seem to remember from pictures elsewhere. maybe these huge power supplies are doing a similar thing all on their own, as I understand that many amp supply rails today need a form of 'balanced' supply to work (say, +50V, 0, -50V) - hope I have this right? Those sodding great transformers may have enough iron in them to help filter any little muck coming in perhaps? I haven't forgotten your kind invitation and promise to take you up on it when my sanity and 'life' is back on an even keel...
P.S. My BMU is the original loan unit with less doping inside to damp buzzes and hums. During the day it's as silent as anything (the 'headphone' Crown D-60 snarls like a swarm of angry bees, which some of them did). Come midnight, the situation is reversed, the Crown usually going fairly silent and the MBU starts buzz a little. If one of these is to be shipped around, the packing must be kept VERY substantial, as I remember mine came straight from Macca back to NVA, opened up in front of me to check visuals and possible loose transformer, then straight into my boot. Although he'd packed it well, it was still sliding around in the carton. |
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Post by MartinT on Dec 9, 2015 9:18:32 GMT
The BMU has loanded (interesting typo)! I shall get it setup and start evaluating it later this week.
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Post by dsjr on Dec 9, 2015 9:30:59 GMT
Just plug the bloody thing in and try to forget it's there  Hope it does for you what it did for me... |
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Post by MikeMusic on Dec 9, 2015 9:41:55 GMT
The BMU has loanded (interesting typo)! I shall get it setup and start evaluating it later this week. If it's in your car boot one day and you're passing..... |
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Post by MartinT on Dec 9, 2015 9:51:44 GMT
It's coming to you next (you're on the loan rotation). I'll be dropping it off.
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Post by John on Dec 9, 2015 10:04:36 GMT
Let us know how it goes I am very interested in trying this out for myself
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Post by MikeMusic on Dec 9, 2015 13:36:50 GMT
It's coming to you next (you're on the loan rotation). I'll be dropping it off. Ooh ta Unless it's that good, then maybe not |
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Post by accudazed on Dec 9, 2015 23:26:33 GMT
Hi Accudazed, as you are interested in cables I had a look and found these in the loan scheme: Interconnects SSC 1m SSP 1m T.I.S 1m Speaker cables LS1 3m LS3 3m LS5 3m LS6 3m TSCS (ex LS7) 3m I use LS5 and consider it one of my best buys (and I was previously skeptical about how big a difference a cable could make), although I do use NVA amplification so they have been designed to work well with each other. all the best. Guy. Thanks for this Guy. Cheers Steve |
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Post by dsjr on Dec 10, 2015 8:28:36 GMT
I bought LS5 myself after being loaned it as part of my work. It seems to work fine with anything and I feel it improves other 'stuff' too. Going to LS6 is a bigger financial jump than I can currently manage, so I regard LS5 as something of a bargain in comparison with other popular cables bought via dealers..
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Post by ChrisB on Dec 13, 2015 9:20:55 GMT
Steve (Accudazed) sent Kaz a PM on Wednesday night requesting a loan of a cable but, as yet there has been no reply. I notice that since then, 2 people from HFS have also asked to borrow it, thus setting back the opportunity for Steve to give it a try. Now, Kaz hasn't logged on here since the 29th, and I understand that he is a bit busy with other things at the moment. But we have tried very hard to accomodate this scheme within the boundaries of the TAS rules, so I think a little more communication would be helpful. I don't know if anyone else has tried to make use of the service as well?
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Post by dsjr on Dec 13, 2015 10:29:33 GMT
I have nothing to do with it, but what about contacting the Doc directly and saying you're a member of TAS? I don't mean to interfere, but the last thing NVA would want is for people not be able to try the stuff as agreed.
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Deleted
Deleted Member
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Post by Deleted on Dec 13, 2015 10:31:41 GMT
What about posting a request on the thread if you're in a hurry. The date and time of the post will be there and the person will keep their place in the queue. Kaz can then make contact when he looks in.
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Post by ChrisB on Dec 13, 2015 10:55:12 GMT
No hurry on my part, but we agreed how things would work and so far it hasn't gone too well. I happen to know that Steve made the request because I know him from outside forum land. I wanted to bring this up because, for all we know there may be several other PMs sitting in Kaz' inbox with the people who wrote them sitting patiently, wondering what's going on.
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Post by MartinT on Dec 13, 2015 11:03:04 GMT
I did let RD know and Kaz has a few issues to deal with. Hopefully he'll be back soon. Meanwhile, the BMU is going to MikeMusic next. |
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Post by dsjr on Dec 13, 2015 12:24:06 GMT
No hurry on my part, but we agreed how things would work and so far it hasn't gone too well. I happen to know that Steve made the request because I know him from outside forum land. I wanted to bring this up because, for all we know there may be several other PMs sitting in Kaz' inbox with the people who wrote them sitting patiently, wondering what's going on.
Sadly, 'real life' can genuinely get in the way of a hobby/best laid plans etc.. Hope it gets sorted soon.
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