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Old 21st January 2007, 12:43 AM   #1
Glenn_G is offline Glenn_G  Australia
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Default 24v Aikido for newb.

I am itching to get into tubes and I thought that the 6GM8 version of the Aikido topology would be the ideal starter due to its simpicity and low voltage. I have trawled the forum and the Tube CAD site for info.
The most developed PSU I can find is this one.Click the image to open in full size.
A regulated 24v with choke.
A couple of questions.

1. For anyone that has built this amp, is this the best PSU?

2. The schematic calls for a 24va transformer, I have a 24v 70ma trany that I thought would suit but was wondering if the 70ma might be a little high. Will this be an issue?

Thank you in advance.
Glenn.
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Old 21st January 2007, 12:53 AM   #2
Glenn_G is offline Glenn_G  Australia
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Woops! I meant , I have a 24v 70va transformer. Not 70ma.

Sorry.
Glenn
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Old 21st January 2007, 01:14 AM   #3
Sheldon is offline Sheldon  United States
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It's more than you need, so voltage at the secondary will probably be somewhat higher than shown. But your regulator will take care of that for you.

Sheldon
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Old 21st January 2007, 03:05 AM   #4
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Default Re: 24v Aikido for newb.

Quote:
Originally posted by Glenn_G

1. For anyone that has built this amp, is this the best PSU?
I haven't built this circuit, but I'll offer some "newb" advice: don't worry about building the best. That comes after building a few things. If JB says this is a good PSU for your design, why complicate and delay things by inviting change?

You wont find "the best" without a standard to compare it with and this is as good a starting point as any.
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Old 21st January 2007, 03:05 AM   #5
jayme is offline jayme  United States
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Why the diode across the choke?

I've seen Broskie put this in a couple other PSUs that he has designed, and I haven't really understood why...
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Old 21st January 2007, 05:54 AM   #6
Sheldon is offline Sheldon  United States
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Quote:
Originally posted by jayme
Why the diode across the choke?

I've seen Broskie put this in a couple other PSUs that he has designed, and I haven't really understood why...
I'm guessing that it's to prevent an inductive kick when the power is shut off, or the output disconnected under power.

Sheldon
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Old 21st January 2007, 08:08 AM   #7
Glenn_G is offline Glenn_G  Australia
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Thank you all for your response.

jeff mai, that sounds like great advice to me. For too long I have put off starting, just waiting for that perfect design.
I am going to hook into this and listen. Then I will play around with it. (if needed).
Wish me luck.
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Old 26th June 2007, 02:25 PM   #8
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This project looks great for a newbie --

Can anyone recommend an appropriate transformer from somewhere like Dick Smiths or Jaycar for this?

Glenn - nice to see a fellow Aussie here! Where did you get the choke from? How is the build coming along?
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Old 26th June 2007, 05:33 PM   #9
zacster is offline zacster  United States
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Maybe I'm the only one that's actually built this 24v version. I used a pre-built regulated PS from International Power that I bought from Mouser. I don't know if they are available to you though. I mounted it in a separate wood chassis with the power switch/fuse and put the board in a steel 'boat'.

This is a very nice sounding pre-amp the way it is with standard parts, nothing fancy except I recently put in Auricaps on the output. Pictures can be found at audiocircle.com, do a search on my name as text.

And you can trust anything John Broskie says, that is if you can understand it.
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Old 26th June 2007, 07:04 PM   #10
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You can use a simple regulator kit, like the TREAD from tangent (www.tangentsoft.net, I think). Inexpensive and probably works great for an application like this.
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