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Old 31st December 2019, 08:45 PM   #121
fab is offline fab  Canada
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I know about food poisoning I had the same a few years ago on December 24th following a Christmas meal at a restaurant. My wife, my sister in law and myself were all sick all evening and night..
I hope you will get better soon
Are your batteries rechargeable or big capacity because of the 50-60ma per channel for bias current

Fab
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Last edited by fab; 31st December 2019 at 08:49 PM.
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Old 2nd January 2020, 06:39 AM   #122
AnthonyA is offline AnthonyA
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Hi fab

Yes it will be my 2nd usspa.
I made so I could play with to a friend with high end equipment. He was so impressed with the last one and asked for a unit to be parked at his home. He is using single ended tube.. So it's something different. It's like.. Expensive better? Sometimes nahh

This will be integrated with rjm emerald phono. That's a good project.. If anyone care to diy a phono. We also tested with some of the best.. No problem with quality.

With a switch for cd and phono, so it will be easy to compare later.

Perhaps this time.. I will try studer 900 power supply. Then make a comparison with other supply since the supply will be on separate box. Easy to compare. But need rebias everything with every change

I made some material change.. That guy have a very revealing and clean sounding system. So soften it some with carbon resistors. And a slightly more dirtier supply. He got all the slam already one could wish for so...

Happy new year all
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Old 2nd January 2020, 05:25 PM   #123
fab is offline fab  Canada
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Hi Anthony
I am glad to know that your friend also likes the USSPA. Was it version 1 or 2 he listened to?
Fab
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Old 2nd January 2020, 08:55 PM   #124
AnthonyA is offline AnthonyA
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Hi fab

V1, he heard

But im making v2. And aiming to be more rounded weighty textured , it should suite his system more. As he have diamond tweeter and carbon cones. Need more mid. Just waiting for the supply kit
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Old 4th January 2020, 04:20 PM   #125
AnthonyA is offline AnthonyA
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IMG-20200104-WA0062.jpeg

Done for the day.

I'm not using kemet cap this time.. Want to sound less clean and see how it goes

Waiting for supply
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Old 4th January 2020, 10:22 PM   #126
fab is offline fab  Canada
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Hi AnthonyA
The specified power supply caps combination has been selected (from Nippon Chemicon white paper) for optimal impedance response against frequency band. Your new cap should also work even though not optimized
Without knowing exactly what you mean by “less clean” have you tried to modify H2 level using one optional resistor as per section 7 of the manual?
I thought that the goal was to be clean
Fab
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Old 5th January 2020, 05:01 AM   #127
AnthonyA is offline AnthonyA
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Hi Fab

. I will learn how to adjust H2 using scope with my friend later. The jfet is getting scarce so it's not very tightly match, could only manage 0.6ma diff . Will be better I learn to use the oscilloscope.
Darn.. I should have ordered the caps with u.. Lol let's light it up first
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Old 5th January 2020, 03:47 PM   #128
fab is offline fab  Canada
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Hi AnthonyA
The scope function will not show H2 unless the scope has FFT function.
Your jfet are very well matched if they only have 0.6ma difference on IDSS
You should have reduced H2 with that good match
For the different cap type it is not that much a big deal, it is just that I want things to be optimized as much as possible...
Good luck
Fab
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Old 6th January 2020, 07:16 AM   #129
AnthonyA is offline AnthonyA
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YouTube
Dats the guy


Yes.. Have fft
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Old 3rd February 2020, 08:53 AM   #130
AnthonyA is offline AnthonyA
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IMG-20200203-WA0038.jpeg

Just waiting on the power supply and ready to go

Havent received the R and caps from you Fab.
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