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Post by sq225917 on Mar 31, 2019 20:15:11 GMT
Was it one of mine or a self build?
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Post by Deleted on Apr 1, 2019 6:05:33 GMT
One of yours I believe.
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Post by sq225917 on Sept 2, 2019 19:39:33 GMT
and as if by magic.....  |
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Post by karma67 on Sept 2, 2019 19:40:53 GMT
any takers? or building for someone?
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Post by Deleted on Sept 2, 2019 21:42:44 GMT
and as if by magic..... I have a question, I have seen in an internal picture of a paradise somewhere, that suggested there may be more than one polyester capacitor used. I did isome asking around and it seems as though they can introduce '2nd order' (that could be wrong) harmonics. as found in valve amplifiers. I wondered why they would be used in anything if this is the case. On further investigation, it seems that a plethora of companies are using them in class D amplification, which could also point to a deliberate attempt at using the capacitors to 'tune' the amplifiers to sound less clinical. BTW, thats the opinion of someone i was talking to recently, but it's been on my mind since hearing them. Are there any polyester caps in your builds Si, and if so, why? |
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Post by sq225917 on Sept 2, 2019 23:15:59 GMT
www.renardson-audio.com/capdist.htmlWorth a read. Worrying about capacitor distortion at levels of -140db is pretty pointless. At around mid -70 db for thd and noise the Paradise is as quiet as a phonostage gets. The distortion products from any caps in the signal path are 1000x lower than the overall noise of the Paradise. You just can't hear them, you could barely hear them if their contribution was 100 fold greater. I prefer to use styrene for the riaa anyway, but have no qualms about padding them out with small value 16-100pf of wima polyester caps to reach the required 11n and 33n values of the riaa. Once again any noise contribution from a cap would be relative to its capacitance so even a 100pf polyester paired with a 33.2n styrene is only going to contribute at worst 0.33% or 1% of that -140db potential cap noise into the signal. I think that's roughly equal to the cube root of sweet f-ck all, but my math might be out... The effects of cap distortion on the output of a class d amp modulation in the multiple 100kHz range and the at most 20kHz range of a phonostage are worlds apart.
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Post by Deleted on Sept 3, 2019 7:20:44 GMT
www.renardson-audio.com/capdist.htmlWorth a read. Worrying about capacitor distortion at levels of -140db is pretty pointless. At around mid -70 db for thd and noise the Paradise is as quiet as a phonostage gets. The distortion products from any caps in the signal path are 1000x lower than the overall noise of the Paradise. You just can't hear them, you could barely hear them if their contribution was 100 fold greater. I prefer to use styrene for the riaa anyway, but have no qualms about padding them out with small value 16-100pf of wima polyester caps to reach the required 11n and 33n values of the riaa. Once again any noise contribution from a cap would be relative to its capacitance so even a 100pf polyester paired with a 33.2n styrene is only going to contribute at worst 0.33% or 1% of that -140db potential cap noise into the signal. I think that's roughly equal to the cube root of sweet f-ck all, but my math might be out... The effects of cap distortion on the output of a class d amp modulation in the multiple 100kHz range and the at most 20kHz range of a phonostage are worlds apart. Hi Simon, Thanks for that. I've been raking the Internet over for a week or so now trying to find out so I appreciate the answer. I'll have a read of that article 😊 |
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Post by sq225917 on Dec 15, 2019 19:59:01 GMT
flic.kr/p/2hZdVmZAnd so it begins. All transistors matched and stuffed, fitted all the parts I had already, big order in with Mouser for most of the rest. Spent two hours yesterday looking for Fischer sk482-75 heatsinks and clips.
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Post by Deleted on Dec 15, 2019 20:04:08 GMT
I could make one o' them easy.
I just don't want to.
😌
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Bigman80
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Post by Bigman80 on Dec 15, 2019 20:55:34 GMT
flic.kr/p/2hZdVmZAnd so it begins. All transistors matched and stuffed, fitted all the parts I had already, big order in with Mouser for most of the rest. Spent two hours yesterday looking for Fischer sk482-75 heatsinks and clips. I really want to try one of these. Hopefully I can get one built in the new year. Going to play close attention to this instructional build??? Lol |
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Post by Bigman80 on Dec 16, 2019 13:44:21 GMT
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Post by Deleted on Dec 16, 2019 13:58:56 GMT
flic.kr/p/2hZdVmZAnd so it begins. All transistors matched and stuffed, fitted all the parts I had already, big order in with Mouser for most of the rest. Spent two hours yesterday looking for Fischer sk482-75 heatsinks and clips. Presume these are too big? My girlfriend said that to me. I said no, leave 'em alone, they're just fine!  |
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Post by Bigman80 on Dec 16, 2019 14:02:08 GMT
Presume these are too big? My girlfriend said that to me. I said no, leave 'em alone, they're just fine! Hahahaha, shocking Geoff |
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Post by Deleted on Dec 16, 2019 14:05:41 GMT
My girlfriend said that to me. I said no, leave 'em alone, they're just fine! Hahahaha, shocking Geoff I wouldn't say they were enormous, but if I give her a piggy-back, they keep my ears warm.  |
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Post by Bigman80 on Dec 16, 2019 14:07:18 GMT
I wouldn't say they were enormous, but if I give her a piggy-back, they keep my ears warm. The image is terrifying lol |
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Post by macca on Dec 16, 2019 19:00:28 GMT
I went with this bird, she was wearing a really baggy jumper and I thought she was a bit chubby but turned out she was quite slim, she just had tits like barrage balloons. Her bra looked like it had been designed by the same bloke who did the Forth Bridge. Never seen anything like it before or since.
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Post by firebottle on Dec 16, 2019 19:01:23 GMT
It didn't happen if there aren't pictures ..........
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Post by macca on Dec 16, 2019 19:07:42 GMT
I'm afraid that I was very, very drunk.
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Post by Bigman80 on Dec 16, 2019 19:08:54 GMT
It didn't happen if there aren't pictures .......... HAHAHAHA, you bounder! But yes, I agree...............waiting......lol |
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Post by Bigman80 on Dec 16, 2019 19:14:15 GMT
I'm afraid that I was very, very drunk.  |
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Post by sq225917 on Dec 16, 2019 19:40:16 GMT
Yeh it has to be the 75s.
I'll link to my complete bom if you like, I need to update a few bits. Are you going vanilla, or vishay naked?
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Post by electronumpty on Dec 16, 2019 22:00:23 GMT
I really want to try one of these. Hopefully I can get one built in the new year. Going to play close attention to this instructional build??? Lol Did you order some boards then? Me too lol  |
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Post by Bigman80 on Dec 16, 2019 22:33:55 GMT
I really want to try one of these. Hopefully I can get one built in the new year. Going to play close attention to this instructional build??? Lol Did you order some boards then? Me too lol I missed it!!!! I got to messages about it, one off you, one off SQ, which arrived pretty much withing minutes thanks to my notifications going slow. When I finally messaged him, they'd all gone. I'm on a waiting list now. |
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Post by electronumpty on Dec 16, 2019 23:06:07 GMT
Ah, bummer . I got the feeling there are a few peeps interested though so you may be in luck with him doing another run of boards.
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Post by antonio on Dec 17, 2019 5:35:19 GMT
I wouldn't say they were enormous, but if I give her a piggy-back, they keep my ears warm. Can you still give her a piggy back Geoff?  |
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Post by Bigman80 on Dec 17, 2019 6:20:40 GMT
Yeh it has to be the 75s. I'll link to my complete bom if you like, I need to update a few bits. Are you going vanilla, or vishay naked? Wont be Vishay Naked, unless I can find some cheeeeep |
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Post by Bigman80 on Dec 17, 2019 6:21:47 GMT
Ah, bummer . I got the feeling there are a few peeps interested though so you may be in luck with him doing another run of boards. Yeah, I am on a waiting list so it looks like the new year sometime, but I am ok with that. I'm in no rush, unlike the many other projects I have undertaken lol |
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Post by sq225917 on Dec 17, 2019 19:15:53 GMT
Build it slowly, go vishay for 10k input bridge, riaa and input stage 33r. £260 but worth it it.
If not use 0.1% 50ppm Dale's. That's my base build.
1% 100ppm dont cut it, you want mega precision.
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Post by Bigman80 on Dec 17, 2019 20:31:25 GMT
Build it slowly, go vishay for 10k input bridge, riaa and input stage 33r. £260 but worth it it. If not use 0.1% 50ppm Dale's. That's my base build. 1% 100ppm dont cut it, you want mega precision. £260 on resistors make me feel a bit nauseous lol I'll probably go for the Dale 0.1% as I've used those before and liked them. I might do something completely bonkers though lol |
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Post by electronumpty on Dec 17, 2019 22:13:51 GMT
Build it slowly, go vishay for 10k input bridge, riaa and input stage 33r. £260 but worth it it. If not use 0.1% 50ppm Dale's. That's my base build. 1% 100ppm dont cut it, you want mega precision. I might do something completely bonkers though lol Who, you? Gerraway wit ya!!…. |
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