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Old 19th September 2013, 03:49 PM   #21
bekim is offline bekim  Albania
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Quote:
Originally Posted by Gost22 View Post
The inductance of the coil (L1) can be 10 .. 20H for current> 100mA
Regards
Thanks man.

I build this PS and I have ordered choke 10H 100mA.
Aikido works great with this design.


Appreciate your reply.
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Old 20th September 2013, 04:48 AM   #22
Gost22 is offline Gost22  Bolivia
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Bekim, enjoy music in your new Aikido tube pre-amplifier!
If you are able to show that the schematic Aikido preamp,
Cheers!
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Old 20th September 2013, 10:46 PM   #23
bekim is offline bekim  Albania
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Quote:
Originally Posted by Gost22 View Post
Bekim, enjoy music in your new Aikido tube pre-amplifier!
If you are able to show that the schematic Aikido preamp,
Cheers!
Gost22,

Here is schematics of Aikido preamp which I build.
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File Type: jpg AIKIDO schematics.JPG (40.5 KB, 218 views)
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Old 21st September 2013, 05:52 AM   #24
Gost22 is offline Gost22  Bolivia
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I created Aikido cathode follower with tube12AU7 and gives great sound!
Power supply anode mine is B + = 250V.
What is the sound of your Aikido preamp? At the entrance to the audio input signal using (CD-payer, DVD or,....?)
Regards!
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File Type: jpg AIKIDO schematics-1.JPG (44.7 KB, 195 views)

Last edited by Gost22; 21st September 2013 at 06:03 AM.
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Old 21st September 2013, 04:25 PM   #25
bekim is offline bekim  Albania
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Aikido preamp sounds great. As you can see in posted schematics, I use 6N1P-EV input tube and 6N6P output tube. I was thinking to use 12AX7 but, I cannot find good ones at the moment, and tubes I am using are great sounding.
6N1P-EV dates year 1973 and 6N6P 1989 - NOS tubes [CCCP = USSR].
I am using cheap decoupling caps, and after few weeks I will put Auricap XO inside. In mean time 10H/100mA will arrive.

There is a little hum and fuzz but this comes from smps I am using for heaters. I manage to reduce the noise to minimum by using caps and circuit as posted in other thread for proper grounding, this helped a lot.

Weird fuzz from Aikido Pre, HELP!


Sound, hmm...me like :-) I had listen various preamps in past and I had few tube preamps, but this one - Aikido, reproduces voices so lifelike and detail.

thanks

Last edited by bekim; 21st September 2013 at 04:34 PM.
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Old 21st September 2013, 07:15 PM   #26
Gost22 is offline Gost22  Bolivia
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Thumbs up Cathode follower with ecc82

Here's my Aikido cathode follower with tube 12AU7 (ecc82)!
Plays beautifully without any noise.
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File Type: jpg Cathode follower with ecc82.jpg (308.7 KB, 184 views)
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Old 21st September 2013, 07:46 PM   #27
bekim is offline bekim  Albania
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Great!

Looks nice. :-)
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Old 22nd September 2013, 08:15 PM   #28
tomchr is offline tomchr  United States
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If you want a quiet power supply, it's very, very hard (if not impossible) to beat a good regulated supply. I have experimented with a lot of different power supply regulators; floating op-amp designs, traditional series regulators, tube regulators, etc. The Maida Regulator provides the best performance of them all. Mike Maida's original regulator does have some drawbacks, so for the 30th anniversary of the original Maida Regulator, I built the 21st Century Maida Regulator to improve performance and address the drawbacks of the original circuit. You can read about the design process in the 21st Century Maida Regulator Thread as well as on my website.

If you want a quiet supply, I highly recommend using my 21st Century Maida Regulator (but of course, I'm slightly biased... ).

~Tom
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Last edited by tomchr; 22nd September 2013 at 08:17 PM.
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Old 23rd September 2013, 08:54 AM   #29
bekim is offline bekim  Albania
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Quote:
Originally Posted by tomchr View Post
If you want a quiet power supply, it's very, very hard (if not impossible) to beat a good regulated supply.

If you want a quiet supply, I highly recommend using my 21st Century Maida Regulator (but of course, I'm slightly biased... ).

~Tom
Yes, I agree with you.

Case I am using for Aikido isn't roomy and I had to use smps for heaters and separate transformer for HV. I didn't want to put bigger trafo on top of the case. Noise comes from smps, I check with scope and so far I manage to decrease large amount of noise by connecting capacitor from smps ground to earth. I used 22nF/400V, and I will increase size likely to 100nF and see if the hum will go.
HV psu is posted on this thread, I choose this design as I try on 300B PSE design, no noise at all.

thanks
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