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Old 28th June 2013, 06:59 AM   #2451
hesener is offline hesener  Germany
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@metallicus69: just checked the pictures of your build, beautiful! you obviously put a lot of effort into this. I am sure it sounds great!

@kamis: These pots are wirewound, not cermet. Over at the "Blowtorch 2" thread there was a lot of (somewhat philosophical) debate over what is better, no intention to repeat it here. But some swear by the possibility of finetuning the loading resistance.

One Paradise builder asked about loading capacitance, typically not an issue with MC carts due to the low impedance. The values suggested were between 220pF...2nF. Thoughts?
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Old 28th June 2013, 07:21 AM   #2452
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He sender, I've tried from a couple of hundred pF up to 3.3n. Maybe 20 or so combinations along with resistor values from 20r to 4k. While my Benz LP doesn't care what it is loaded with the Lyra Kleos I had last week certainly preferred a lower loading than my 2k 2.2n. It seemed happiest around 600r and 500pf.
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Old 28th June 2013, 08:04 AM   #2453
amsoque is offline amsoque  Romania
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Now, that is an extreme thermo-coupling. Very nice setup. I save your photos, just for inspiration, you know.
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Old 28th June 2013, 08:11 AM   #2454
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by metallicus69 View Post
I've just added a second RCA pair in parallel with the input. I can plug there whatever R I need. The problems with the switch in CX1000 convinced me to avoid as much as possible this kind of elements in the low level path.
For the moment I have connected there the recommended load by the cartridge producer. And I don't intend to change that. I did not switch off the Paradise since the moment I have integrated it into the main system (around end of May, IIRC).
Very, very ... nice, impressive!
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Old 28th June 2013, 11:20 AM   #2455
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by kamis View Post
Why should 10 turn cermet pot be sonically superior to good industrial grade switch and metal film resistor?OK, resolution is infinite, but it is not so critical.
This is not a cermet 10 turn, it is a WW 10 turn.
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Old 28th June 2013, 11:20 AM   #2456
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Thanks for your remarks!
In the next build I intend to cool down the input transistors using a peltier element and a similar arrangement. But I have still other projects to finish, so that build will wait. On the other hand, I have to think how to thermally isolate the cooled trannies form the hot outside world, how to supply the cooling element and lots of related challenges, so I am not into a hurry. I will use some ancient low Rbb' trannies that I don't have spares for, and that tells me I need to plan even better this whole build.
First things first! I have a very silent high end phono stage that really needs some good company I feel the potential of Paradise is still not fully revealed in actual configuration. The sound improved a lot with passage of time, but I also need to work out the rest
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Old 28th June 2013, 11:26 AM   #2457
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by metallicus69 View Post
I've just added a second RCA pair in parallel with the input. I can plug there whatever R I need. The problems with the switch in CX1000 convinced me to avoid as much as possible this kind of elements in the low level path.
For the moment I have connected there the recommended load by the cartridge producer. And I don't intend to change that. I did not switch off the Paradise since the moment I have integrated it into the main system (around end of May, IIRC).
Cartridge loading results are system dependent, you would surely be surprised if you would experiment with different loadings.
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Old 28th June 2013, 11:39 AM   #2458
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I don't deny that, and that is why I left this possibility (additionally I might change the cartridge in the future). Anyway, i expect that on MM systems the loading has more impact than on MC. Something to be tested, anyway
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Old 28th June 2013, 11:40 AM   #2459
RCruz is offline RCruz  Switzerland
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IMO it is the other way around
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Old 28th June 2013, 12:33 PM   #2460
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A wirewound pot has virtually no excess noise and should have low distortion.
One problem with a Peltier is that water can condense when you use a close box.
The reduction in noise will be minimal.
One guy made an experiment and he found ca. 1dB at -60 Celsius.
When you want to really reduce noise you have to cool to much lower voltages.
It has being done in physics labs.
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