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Post by Deleted on May 19, 2018 18:58:56 GMT
Massive hello from me. Bit late joining but better late than never. I see the usual suspects are here. Greetings from north yorkshire.
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Bigman80
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Post by Bigman80 on May 19, 2018 19:05:05 GMT
Massive hello from me. Bit late joining but better late than never. I see the usual suspects are here. Greetings from north yorkshire. Really great to see you here, Stu. I've loved reading about your exploits from day one. In fact it was before that because I was so enthralled by your PFM threads before I knew you as Stu.
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Post by Deleted on May 19, 2018 19:35:42 GMT
Howdy!
S.
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Post by dsjr on May 19, 2018 21:17:03 GMT
Welcome!
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Post by antonio on May 20, 2018 5:09:53 GMT
Nice to see you've joined Stu.
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Post by Deleted on May 20, 2018 6:52:21 GMT
Thanks all. I dont have decades of box swapping experience or exposure to lots of different gear but i love a bit of diy. I tend to keep stuff i have bought for a long time. Same with everything, my car is a 1998 diahatsu fourtrak bought by me when it was 18 months old.
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Post by dsjr on May 20, 2018 9:47:00 GMT
But you go where other audio builders fear to tread and hope you'll have the time to share on here the music and the gear builds you've done.
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Post by Deleted on May 20, 2018 10:38:34 GMT
I will try my best Dave. I have little time for anything at the moment. Thats the problem with having a seasonal job. Its too busy March to November and quiet for the winter.
Do i really go where others fear to tread ? I suppose i have an open mind to these things.
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Bigman80
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Post by Bigman80 on May 20, 2018 10:48:58 GMT
I echo what Dave said. It's not just that you go where others fear to tread, you're also happy to share experiences and pics without wortying what others will think or say. I had my own WTF moment when I first saw a speaker cabinet you'd made up from bits, but now I totally get why you did it. No point in making a finished article when it's just a learning experience.
In those circumstances most people would either build a finished article and convince themselves it was perfect, so no need to try anything else,, or just not bother to experiment because it was too much work.
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Post by Deleted on May 20, 2018 11:06:43 GMT
Aye its a lot of work but once i get the bit between my teeth then there is no stopping me.
Those speakers made of old crappy ikea furniture are a good example of recycling. Because i am still learning and changing things as i try other ideas then there is little point in making a finished article. I would be gutted if i made an end product and then realised i had something else to try. I will have to draw the line somewhere though.
There is no better way to learn
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Post by Deleted on Oct 4, 2018 9:09:14 GMT
Finally uploaded an avatar.
Anyone recognise the pic ?
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Post by Deleted on Oct 4, 2018 9:23:11 GMT
Your body during open surgery?
S.
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Bigman80
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Post by Bigman80 on Oct 4, 2018 9:27:19 GMT
The upright cards look like Naim.
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Post by Deleted on Oct 4, 2018 9:31:06 GMT
Finally uploaded an avatar. Anyone recognise the pic ? It looks familiar, but can't think where from.
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Post by Deleted on Oct 4, 2018 10:31:39 GMT
Yes its a Naim Nac. This pic (from 2005) was from a member at PFM called Linnik who decided to take each components link to 0V straight back to the star ground via a spaghetti style wiring system. Was a dream Nac mod apparently although I never tried it when I had a 72. I love a pic of some crazy wiring mess as bits of the puzzle get added or changed.
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Bigman80
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Post by Bigman80 on Oct 4, 2018 10:37:12 GMT
Even if he just left the sleeve off, it woulda sounded better, it amazes me how much better amps sound just with the lid off. Mount the circuit on an acrylic slab or similar and I bet the sound would improve again. It’s such a pity that nearly everything comes in a metal box because my ears tell me that may be close to the worst solution.
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Post by Deleted on Oct 4, 2018 11:23:18 GMT
Even if he just left the sleeve off, it woulda sounded better, it amazes me how much better amps sound just with the lid off. Mount the circuit on an acrylic slab or similar and I bet the sound would improve again. It’s such a pity that nearly everything comes in a metal box because my ears tell me that may be close to the worst solution. I agree entirely Andrew. Aluminum or even steel cases are the norm. Manufacturers have regulations to adhere to and electrical safety is high on the list. Metal case must be connected to safety ground. The only other way for a manufacturer to do it is by classII and non conductive cases. The other thing is RFI and other interference. A metal case will protect the circuitry inside from this (apparently). But as RD points out a metal case will keep interference out but it is also trapping inside it the unwanted interference produced by what ever is inside, which bounces around potentially doing all sorts of damage. What we need is a case which stops it coming in but allows it to exit. Who ever invents that would be very rich. Then there are thermal issues. A metal case is often an ideal heat sink when needed. And here I am looking at my sound system all laid out in a jumbled mess. No metal cases, mainly wood 60cm2 sheets of chipboard and huge 6mm sheets of aluminium for heat sinks. I don't think I have a problem with RFI or anything like that but then some measurement monkey would probably try to convince me otherwise. Dealing with transformer and AC wiring stray field is a different matter altogether though and one which I am learning more and more about. Wiring layout, transformer placement blah blah blah. Distance is king here, forget about metal screens they do next to nothing with low frequency fields like that from transformers. Although I have not tried my inch thick cast iron man hole cover as shield yet. I will let yawl know if I manage to do anything with it.
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Post by Deleted on Oct 4, 2018 11:32:10 GMT
Oh and don't forget about cases that trap all the heat in and leaving stuff powered up all the time. That one bugs me. Let the heat out and components last a hell of a lot longer.
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Bigman80
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Post by Bigman80 on Oct 4, 2018 11:41:07 GMT
Even if he just left the sleeve off, it woulda sounded better, it amazes me how much better amps sound just with the lid off. Mount the circuit on an acrylic slab or similar and I bet the sound would improve again. It’s such a pity that nearly everything comes in a metal box because my ears tell me that may be close to the worst solution. I agree entirely Andrew. Aluminum or even steel cases are the norm. Manufacturers have regulations to adhere to and electrical safety is high on the list. Metal case must be connected to safety ground. The only other way for a manufacturer to do it is by classII and non conductive cases. The other thing is RFI and other interference. A metal case will protect the circuitry inside from this (apparently). But as RD points out a metal case will keep interference out but it is also trapping inside it the unwanted interference produced by what ever is inside, which bounces around potentially doing all sorts of damage. What we need is a case which stops it coming in but allows it to exit. Who ever invents that would be very rich. Then there are thermal issues. A metal case is often an ideal heat sink when needed. And here I am looking at my sound system all laid out in a jumbled mess. No metal cases, mainly wood 60cm2 sheets of chipboard and huge 6mm sheets of aluminium for heat sinks. I don't think I have a problem with RFI or anything like that but then some measurement monkey would probably try to convince me otherwise. Dealing with transformer and AC wiring stray field is a different matter altogether though and one which I am learning more and more about. Wiring layout, transformer placement blah blah blah. Distance is king here, forget about metal screens they do next to nothing with low frequency fields like that from transformers. Although I have not tried my inch thick cast iron man hole cover as shield yet. I will let yawl know if I manage to do anything with it. I don’t know if the NVA statement aesthetics would be a possibility with your kit, but I think they are one of the most intelligent and pleasing solution there is for SS amps. Certainly an acrylic slab would seem to be a great start, I’d probably try not to cover the transformers, at least not with metal. If I ever find a wrecked Campion, I will buy it and strip it, I’m exceeding,y curious about that outcome.
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Post by macca on Oct 4, 2018 11:45:07 GMT
Even if he just left the sleeve off, it woulda sounded better, it amazes me how much better amps sound just with the lid off. Mount the circuit on an acrylic slab or similar and I bet the sound would improve again. It’s such a pity that nearly everything comes in a metal box because my ears tell me that may be close to the worst solution. . And here I am looking at my sound system all laid out in a jumbled mess. No metal cases, mainly wood 60cm2 sheets of chipboard and huge 6mm sheets of aluminium for heat sinks. I don't think I have a problem with RFI or anything like that but then some measurement monkey would probably try to convince me otherwise. . I don't think they would try to convince you with rhetoric. I think the 'measurement monkey' would measure the output from the circuit in a case and the same circuit out of the case and see if there was any difference. If there was RFI, or a difference in the amount of RFI then it would show up. If there wasn't then it wouldn't and either way you'd have your answer without any need for discussion.
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Post by dsjr on Oct 4, 2018 15:38:43 GMT
I believe the very best amps for music and measurement in the world are metal cased and generally reliable too... I only kicked off about old Krells because they're thirty plus years old now, but in their first ten years, I doubt many went wrong unless abused... Perpex cases are different in appearance so they stand out in a crowd and make the amps easier to specify and construct for Class 2 insulation etc... All the amp boards sit on aluminium heatsinks of various types and thicknesses and as they use rubbery feet, the board is well decoupled at the small signal end if you think that's important... Don't make too much of it though and invent reasons that just maybe don't exist... P.S. As far as I know, rf amps and similar are all metal cased aren't they? They just have proper care taken in isolation and so on at those frequencies...
P.P.S. Take the covers off and most of any screening is gone. May not matter, but I can't personally hear a positive difference by using an amp naked this way. Can't stand dust ingress either and in fairness to the very warm running Lk1, after thirty years, the main board looked like new still...
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Post by Deleted on Oct 4, 2018 15:46:23 GMT
Sorry, I don't like naked amps.
S.
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Post by Deleted on Oct 4, 2018 18:35:57 GMT
Well you wont find any in the shops Shane. And just as well as most people cant be trusted not to electrocute themselves.
I once got a belt from a lid less CB radio power supply. That made my hair curl .
My stuff wont be staying naked forever but there will be no metal involved except the heat sinks.
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Post by Deleted on Oct 4, 2018 20:11:47 GMT
Well you wont find any in the shops Shane. And just as well as most people cant be trusted not to electrocute themselves. I once got a belt from a lid less CB radio power supply. That made my hair curl . My stuff wont be staying naked forever but there will be no metal involved except the heat sinks. I should be reporting you for possessing nude amps S.
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Post by Deleted on Oct 5, 2018 16:08:27 GMT
it wasn't me guvna
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