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Sound & Comfort MC/MM Phono preamp
Sound & Comfort MC/MM Phono preamp
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Old 26th October 2016, 08:22 PM   #11
Koifarm is offline Koifarm  Netherlands
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I like my bendix 2c51 tubes best with 6v dc or 6,5v ac supply. Did some heater supply testing 20 years ago.

Also look how brite they glow on 6v dc.
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Last edited by Koifarm; 26th October 2016 at 08:25 PM.
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Old 21st January 2017, 10:41 AM   #12
Koifarm is offline Koifarm  Netherlands
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Today i had time to complete the soundpart. Tested it with my thorens TD160 mk2 modded and a ortofon 2m blue mm cartridge. One thing i noticed direcly, background is death quit. Like a battery operated preamp. Riaa frequency respond is within +/- 0,5db. First soundimpression without impedance tuning, tight, dynamic and big sound stage. Very promising. Hopely i can compleet the comfort part in the next view weeks.

The transformer which is custommade works great.
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Last edited by Koifarm; 21st January 2017 at 10:46 AM.
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Old 29th January 2017, 01:56 PM   #13
Koifarm is offline Koifarm  Netherlands
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This afternoon while listen to Eva Cassidy and Ray Charles i designed the comfort part. See picture below.

After rolling some opamps and tubes i prefer the AD847 and Bendix 2C51 combination for the sound part.

The phonopreamp is ideal for rolling opamps and tubes.

Next i build the comfort part and program the software for the Arduino Mega.
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File Type: jpg comfort2.jpg (323.3 KB, 228 views)

Last edited by Koifarm; 29th January 2017 at 01:58 PM.
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Old 29th January 2017, 02:26 PM   #14
ronnydepony is offline ronnydepony  Belgium
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Will this become available ?

Regards,
Ronny
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Old 29th January 2017, 02:50 PM   #15
Koifarm is offline Koifarm  Netherlands
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Hello Ronny,

when i have completed this build. I publish schematic as build, designspark pcb files for pcb ordering, pcb pdf for diy and source code for arduino mega.

Ronny(Koifarm)
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Old 2nd March 2017, 03:47 PM   #16
ronnydepony is offline ronnydepony  Belgium
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How far are you ?

Ronny
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Old 2nd March 2017, 04:03 PM   #17
Koifarm is offline Koifarm  Netherlands
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I have build the comfort PCB. Still listening every day to the sound part. Next i test the comfort PCB just with manual control after that i need to program the arduino software. I have a arduino mega 256 with colourtouchscreen.
The housing i also need to make myself from 25mm mdf. I think i still needs 1 or 2 months to complete this project.

I shall try to publish some photos.

My time for this project is some what limited because I have at the moment 6 other projects with higher priority.
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Old 2nd March 2017, 06:23 PM   #18
ronnydepony is offline ronnydepony  Belgium
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Take all the time you need Ronny
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Old 14th November 2017, 03:01 PM   #19
ronnydepony is offline ronnydepony  Belgium
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and did you make any progress ?
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Old 14th November 2017, 04:18 PM   #20
Koifarm is offline Koifarm  Netherlands
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Sorry, no time for completing the project. Renovating the house of my daugther.

Still listening to the pcb's without housing and arduino controll. The sound is perfect for me. No humm, no hiss and much fun to listen to.
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