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Old 20th May 2007, 08:18 PM   #1
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Default Questions concerning Aikido Line amp

Hi all,
I m very interested in building an Aikido line stage.
Im a newbee to tube and I have some questions:
1) Aikido consists of a SRPP and a white-cathode follower.
(Please correct me, if Im wrong)
So is it the best solution to have bottom and top of the SRPP in one dual triode (and the cathode follower the other tube) or is it better to have the bottom triodes in one system and the top in the other?
2) Power supply
I have read about the requirement to float the filament power supply to meet voltage limitations. Can someone explain this or post a schematic?
I have heard that a full tube rectifier and tube regulated power supply is better in terms of sound quality. Can someone post aschematic or a link?

Thanks in advance
Rainer
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Old 20th May 2007, 08:23 PM   #2
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http://www.tubecad.com/2004/blog0011.htm

Ranier,

About the best thing to do is visit the site and read the numerous articles.
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Old 20th May 2007, 11:40 PM   #3
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1) No, Aikido is not a SRPP followed by a white cathode folower. It is a grounded cathode amp with an equilivent triode as a load (instead of plate resistor or ccs) followed by a cathode follower with an equilivent triode as a load( instead of plate resistor or ccs). It is generally done with the amp as one tube and the follower as another tube. This also allows for using different type tubes, which would probably lead to a better sound, because a tube that is good at being a gounded-cathode is not necessarily good at being a cathode follower.

2) To decide on the voltage divider for the heaters, you first need to decide on the tubes to use and the B+ voltage you will use. Same with the regulated B+.

I agree with burnedfingers, you should read all the literature on the Aikido first.
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Old 21st May 2007, 08:06 AM   #4
Stixx is offline Stixx  Germany
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Hallo Rainer,

just to add to the previous comments...
there is a nice pdf about building the aikido linestage/headphone amp floating around the net, but it is too large to post. In case you are interested mail me, and I will send it to you.
I am about to build an aikido headphone amp using the noval boards from Broskie....absolutely splendid pcb's!!

As for the filament supply the heaters are elevated in reference to B+...done via a simple voltage divider. I could supply a schematic as well.

Cheers,
Oliver
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Old 22nd May 2007, 08:55 AM   #5
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Hello Stixx,
it is very kind of you to offer the sending of this pdf. I appreciate it.
I have updated my email, so it should be possible to send the pdf.

Thank you.

Best regards
Rainer
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Old 22nd May 2007, 12:14 PM   #6
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Quote:
Originally posted by Rainer Weber

I have updated my email, so it should be possible to send the pdf.
Hi Rainer,
Attachments cannot be sent through the forum Email system. You should send your Email address directly to Stixx.
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Old 22nd May 2007, 07:51 PM   #7
Stixx is offline Stixx  Germany
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Has been sent to his private adress...

Rainer, did you receive it?
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Old 23rd May 2007, 08:17 AM   #8
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Hello Stixx,
has I have received it. Thank you very much.
There is a lot of usefull information.

Regards
Rainer
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