24v Aikido for newb.

Glenn_G · 20th January 2007, 11:43 PM

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.

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.

Glenn_G · 20th January 2007, 11:53 PM

Woops! I meant , I have a 24v 70va transformer. Not 70ma.

Sorry.
Glenn

Sheldon · 21st January 2007, 12:14 AM

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

jeff mai · 21st January 2007, 02:05 AM

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.

jayme · 21st January 2007, 02:05 AM

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...

Sheldon · 21st January 2007, 04:54 AM

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

Glenn_G · 21st January 2007, 07:08 AM

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.

lordearl · 26th June 2007, 01:25 PM

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?

zacster · 26th June 2007, 04:33 PM

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.

motherone · 26th June 2007, 06:04 PM

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.

20th January 2007, 11:43 PM	#1
Glenn_G diyAudio Member Join Date: Jan 2007	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. 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.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
newb 101 help	etec_noob	Instruments and Amps	3	17th November 2006 12:18 AM
newb 101 help	etec_noob	Solid State	1	3rd November 2006 06:04 PM
Hello from a newb	biff_mckeagan	Introductions	8	16th January 2005 07:43 PM
Newb here	bhg41088	Tubes / Valves	1	29th May 2004 01:08 AM
Amp For Newb	meta	Pass Labs	7	9th July 2003 06:22 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

20th January 2007, 11:53 PM	#2
Glenn_G diyAudio Member Join Date: Jan 2007	Woops! I meant , I have a 24v 70va transformer. Not 70ma. Sorry. Glenn

21st January 2007, 12:14 AM	#3
Sheldon diyAudio Member Join Date: Dec 2003 Location: San Diego	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

21st January 2007, 02:05 AM	#5
jayme diyAudio Member Join Date: Sep 2005	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...

21st January 2007, 07:08 AM	#7
Glenn_G diyAudio Member Join Date: Jan 2007	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.

26th June 2007, 01:25 PM	#8
lordearl diyAudio Member Join Date: Jun 2007	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?

26th June 2007, 04:33 PM	#9
zacster diyAudio Member Join Date: Dec 2003 Location: NYC	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.

26th June 2007, 06:04 PM	#10
motherone diyAudio Member Join Date: Apr 2003 Location: Seattle	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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)