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Post by sq225917 on Apr 28, 2020 15:19:44 GMT
I borrowed a mates 6 digit multimeter last year, good for 0.0001mV resolution. I never got round to using it until today setting up this Paradise, trimming the input stage offset. I usually find 0.1mV plus and minus and set the trim pot half way, which is usually 180 degrees from either position.
Did this today and then plugged in his Sigilent and whadya know, I was a whole 0.005mV high. Not bad for a best guess. No matter how much I try I cant beat that theres just enough finesse in the trim pot.
Not exactly small enough for the back pocket though.
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Post by Deleted on Apr 28, 2020 15:21:21 GMT
Not exactly small enough for the back pocket though.
Get yourself one of those Poacher's jackets, you'll be fine.....
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Post by sq225917 on Apr 28, 2020 15:36:52 GMT
It's the same size as my bloody oscilloscope. Its huge.
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Bigman80
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Post by Bigman80 on Apr 28, 2020 15:47:48 GMT
Yes....quite the drift there. I may move a few posts to keep the continuity |
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Post by Deleted on Apr 28, 2020 18:09:31 GMT
Feel free to delete them, BO. No real issue with me. Well... I'm like that. No ego. Just posted them as the mood took me. And all things are transitory...
And yes. It is a Phase Linear 400. The Pink Floyd reference was a giveaway.
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Post by Deleted on Apr 28, 2020 18:19:15 GMT
Two questions, if I may:
Why do you think chokes aren't used more often in power supplies (cost aside)?
You've mentioned the arm lead being the most important in hour view. Considering how the signal is generated, do think a BIG FAT MONSTER of a cable could be viewed as an impediment?
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Post by sq225917 on Apr 28, 2020 18:40:28 GMT
Chokes are big, they're expensive, they have a radiated field that needs addressing via space or alignment, they add significant impedance to the psu rails.
Take hammond's 158t in the Paradise, theres four of them, nearly 100 euros total cost. A simple lm317 costs about 50p.
Also a choke regulated psu balances current against voltage and requires a minimum current drain to be effective, an lm317 regulates voltage and will deliver any current up to the limit of the device.
So they're good for putting in big boxes, good for circuits with a fixed power consumption, class a small stuff or before shunt regulated supplies.
I'm sure Alan has used them in more varied circumstances than I have. They certainly work in the paradise, where due to the bandwidth of the class A shunt regs on the main boards you couldnt effectively feed them with a slower acting psu/reg.
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Post by Deleted on Apr 30, 2020 15:14:22 GMT
Thanks. I was aware of some of what you say. I was just thinking back to Musical Fidelity's first use of choke regulated power supplies in one of their power amps, in the late 80s, I think. At the time it seemed like a bit of a novel approach to power supplies in transistor designs. I know they continued with it elsewhere. Don't know if they still.
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Post by sq225917 on Apr 30, 2020 15:44:03 GMT
Mf has used it many times, was the it the A3CR amp you were thinking off? They've used it in cd players as well.
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Post by Deleted on Apr 30, 2020 20:17:34 GMT
Mf has used it many times, was the it the A3CR amp you were thinking off? They've used it in cd players as well. Can't remember which power amp it was. It was the first product where MF used the topology. The review was in Hi-Fi Answers/The Audiophile. |
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Post by sq225917 on May 1, 2020 11:24:59 GMT
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Post by sq225917 on May 2, 2020 20:18:03 GMT
 PSU all done, some small fiddling with main boards to complete. |
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Bigman80
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Post by Bigman80 on May 2, 2020 20:28:28 GMT
PSU all done, some small fiddling with main boards to complete. No black bolts? Lol |
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Post by firebottle on May 6, 2020 18:18:30 GMT
OK, picked up my Paradise phono stage today (it was essential, honestly constable).
Have to say it is one mesmerizing stage, so quiet a background and so clear and smooth. Wow.
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Post by karma67 on May 6, 2020 18:19:33 GMT
OK, picked up my Paradise phono stage today (it was essential, honestly constable). Have to say it is one mesmerizing stage, so quiet a background and so clear and smooth. Wow. a reference phono stage for sure. |
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Post by electronumpty on May 6, 2020 18:51:33 GMT
Scratched that itch Alan? Good score btw 🙂
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Post by sq225917 on May 6, 2020 19:44:03 GMT
Almost. We'll get it sorted.
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Post by rexton on May 6, 2020 19:48:47 GMT
Have you gone for the full fat version?
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Post by firebottle on May 6, 2020 20:11:15 GMT
Yes Andy.
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Post by rexton on May 6, 2020 21:04:19 GMT
Ahh! Welcome to the brotherhood.
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Post by jimbo on May 7, 2020 4:20:59 GMT
I heard the Paradise about 5 years ago and it did wipe the floor with every other phono stage going at that bake off.
Maybe I should be saving up for a slice of paradise?  |
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Post by antonio on May 7, 2020 4:59:34 GMT
Now that you're valve free you'll have to change you forum name to Fire.  Another convert, nice work Simon. |
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Post by macca on May 7, 2020 6:47:35 GMT
I heard the Paradise about 5 years ago and it did wipe the floor with every other phono stage going at that bake off.
Maybe I should be saving up for a slice of paradise? Surprised you would even have to consider it. If I was getting beck into vinyl it's what I would get. Wouldn't even need to think about it. |
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Post by firebottle on May 7, 2020 7:05:55 GMT
Now that you're valve free you'll have to change you forum name to Fire. Another convert, nice work Simon. I like that. Though I do still have a hybrid phonostage, a valve phono and a valve headphone amp. |
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Bigman80
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Post by Bigman80 on May 7, 2020 8:27:34 GMT
The Paradise is a top class phono. No argument from me. It wasnt an accident that I bought PCBs not long after hearing Simons. Although, Simon did offer me a set of Paradise PCBs and as of yet they havent materialised......may have to reassess his membership status I must say, I am really tempted to get a Paradise build underway. I still like the idea of a one box build, in the denafrips style as I mentioned before, and Alan and I discussed earlier today. I'm quite prepared for it to fail too and need a second box, so its definitely one for the future. |
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Post by jimbo on May 7, 2020 9:21:44 GMT
The Paradise is a top class phono. No argument from me. It wasnt an accident that I bought PCBs not long after hearing Simons. Although, Simon did offer me a set of Paradise PCBs and as of yet they havent materialised......may have to reassess his membership status I must say, I am really tempted to get a Paradise build underway. I still like the idea of a one box build, in the denafrips style as I mentioned before, and Alan and I discussed earlier today. I'm quite prepared for it to fail too and need a second box, so its definitely one for the future. This sounds like an exciting project for the future? |
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Post by sq225917 on May 7, 2020 10:51:38 GMT
Oli, youd really struggle to get it quiet in one box unless you built the psu into an entirely sealed sub box. Even with a steel lid on the psu and steel floor on the other chassis you cant stack them directly.
It's the requirement for venting the main chassis that makes it awkward.
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Post by rexton on May 7, 2020 10:54:38 GMT
4 boxes, everyone should have a 4 box phonostage. You know you need 4 boxes..........
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Post by antonio on May 7, 2020 11:04:09 GMT
Now that you're valve free you'll have to change you forum name to Fire. Another convert, nice work Simon. I like that. Though I do still have a hybrid phonostage, a valve phono and a valve headphone amp.Just thought now you're using the Neurochrome and Paradise, those other bits would just be collecting dust.  Didn't realise there was a headphone amp though. |
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Post by Bigman80 on May 7, 2020 11:11:05 GMT
Oli, youd really struggle to get it quiet in one box unless you built the psu into an entirely sealed sub box. Even with a steel lid on the psu and steel floor on the other chassis you cant stack them directly. It's the requirement for venting the main chassis that makes it awkward. I know, but it would be SO cool wouldnt it. |
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Didn't realise there was a headphone amp though.