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 NEW  Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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PostPosted: 18 Feb 2009, 05:56 
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Joined: 27 Jan 2009, 10:40
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I will start constructing my first Aikido preamp kit. I think i wil use 6sn7 tubes. Can you recommend me a convenient power supply for this kit? The voltage regulator PS-1 http://glass-ware.stores.yahoo.net/ps1kit.html from glass-ware would be OK? Should I use two separate transformers one for b+ and one for heaters and do I need chokes? (too many questions...)


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PostPosted: 18 Feb 2009, 12:26 
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Joined: 26 Aug 2008, 20:57
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Location: Atlanta
PSU design is one of the most frustrating aspects IMO.

Have you done a search on octal aikido preamps to see if there are some good existing designs out there?

Using seperate transformers might be the way to go, it really depends on the total current draw of the heaters and whether you want to go ac or dc.

Bruce has suggested using a 5 stage filter over a 3 stage, it is probably a wise choice as it will reduce ripple to very low levels and result in less noise.


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PostPosted: 18 Feb 2009, 13:08 
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Location: Winnipeg, CANADA
I would think that the regulated glassware power supply was designed to work with their Aikido kits as is. i would not worry about a choke to start off. As for transformer choice, a unit that has both HV + filament or separate transformers would be fine. That will be a matter of choice and availability.

Hey Bill, did you finish up your Aikido 5687 Tube Preamp Project?

Cheers

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[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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PostPosted: 18 Feb 2009, 13:28 
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Of course not! I got too busy building other projects I didn't need. :P


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PostPosted: 18 Feb 2009, 13:50 
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ok then, I think i'll choose the easy way and use the glassware ps-1 psu, it seems adequate for this kit


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PostPosted: 19 Feb 2009, 04:49 
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ok! Now I am searching for a good transformer, something like 250VAC - 100mA for B+ and 12VAC - 3A for the heaters


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PostPosted: 19 Feb 2009, 11:40 
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Hi, I will be interested to see how you make out on this project. I built a 6SN7/6SN7 one a few months ago with a SMPS (from Lighthouse Elect). Sound was fine, but probably because I did something (like put it in a chassis with a clear plastic top) it was extremely sensitive to picking up local noise sources. I could 'find" a flourescent light at 10 paces with it. Right now it is sitting on my pending projects shelf. The SMPS BTW did not cause interference though. Go figure???

Good listening
Bruce

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PostPosted: 19 Feb 2009, 13:40 
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Bruce,

You could always put it in a Faraday cage and enjoy! :hot:

Image


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PostPosted: 19 Feb 2009, 23:04 
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:hot: OMG!

That setup kinda looks like an electric chair!

PS - we don't encourage this sort of behavior! ;)

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[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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PostPosted: 11 Mar 2009, 22:40 
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Hi Everyone, Maybe I'll just wrap it in tinfoil. Since then I modded my Velleman tube preamp and it is so good that it will be a while before I get back to the Aikido. Plus I rather wrapped up in my bigger tube amps. Thanks for the nice photo and inspiration.

Good listening
Bruce

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