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PostPosted: 06 Jul 2010, 19:16 
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Joined: 06 Jul 2010, 19:02
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Hi guys,
I am looking to do a chip amp a tube pre amp project. I saw the beauty and the beast projects and I would like to do this, but I'm not sure what parts to order exactly. I would like to do point to point. I am planning on putting both items in the same box and thinking about maybe adding some analog vu meters. anybody know the exact parts to order though?
thanks,
matt


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PostPosted: 07 Jul 2010, 04:18 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
Both posted projects have schematics. Take your parts list from them.

One HUGE advantage of having the two stage tube preamp and chip power amp in the one box is no inter-connect between pre and power amps. So you save big-time on expensive inter-connects gold plated RCAs etc. Big disadvantage you may get noise from one section in the other and you can't swap-out power and preamps at a whim. You could add a preamp loop in the case to allow direct access to one or the other.

On the upside you get the tube warmth with the chip power. You could call this a hybrid amp: "Hot-chips"!

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Projects:”Image” - Low Profile 100W Class D amp | ”fiih” - 150W Holton inpsired power amp | "Precision" - 300W Class AB Holton power amp | ”Gothic” - FET Push-Pull headphone amp


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PostPosted: 22 Jul 2010, 19:46 
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sorry I forgot about this thread and now I made a new one silly me. :hot:
thanks for the info though I found those schematics.


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PostPosted: 23 Jul 2010, 01:36 
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Let's know how you go.

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Projects:”Image” - Low Profile 100W Class D amp | ”fiih” - 150W Holton inpsired power amp | "Precision" - 300W Class AB Holton power amp | ”Gothic” - FET Push-Pull headphone amp


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PostPosted: 23 Jul 2010, 09:54 
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Well I think i would actually like to build the 3886 amp instead of the 3875. I think I would order from chipamps.com. But I have a question about the dual mono. Since I am guessing I need a transformer for this do I have to use two if I get the dual mono? Is the point of dual mono destroyed by having everything in the same box, the preamp being stereo most likely and not separated channels, and using one transformer (ifI could use just one)? If I wanted to separate the stuff in the box to reduce noise whats is the best material? Would this transformer work? http://www.parts-express.com//pe/showde ... N=27027698
peace,
matt


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PostPosted: 23 Jul 2010, 11:52 
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Joined: 07 Feb 2010, 15:42
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What ohm rating are the speakers you wish to use? going off the manual you want about 25VDC to drive 4 ohm loads and 35VDC for an 8 ohm load, this of course to drive them safely. If it is an 8 ohm speaker you may want to use a 22VAC transformer, when rectified this should give about 30VDC, If it is a 4 ohm speakers then you will want an 18VAC transformer.

If you are wanting to shield compartments in your box then you just need some thick shielding/foil tape, kitchen foil doesnt really work because of its thinness, anyway you could then connect this to ground (forum veterans correct me if i'm wrong) and that should give a reasonable level of protection throughout the box.

Also if noise is a concern read up on http://diyaudioprojects.blogspot.com/2010/07/design-and-construction-of-vacuum-tube.html and look at the points such as keeping AC wiring away from DC, a well designed amp without shielding between compartments should sound better than one that is thrown together, but has a piece of foil separating to parts of it.

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PostPosted: 23 Jul 2010, 13:40 
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I would be using 8 ohm speakers. Thanks for the link


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PostPosted: 23 Jul 2010, 14:28 
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Oh and P.S. that transformer you had listed at parts express should work :D you'll get around 35VDC

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PostPosted: 23 Jul 2010, 17:28 
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Joined: 08 May 2009, 08:20
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Location: Duesseldorf, Germany
Agreed.

The transformer is OK ;-).

Welcome and have fun!

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Cheers,
Tom.

Some of my projects: TDA2050 Chip Amp, the LM3886 Gainclone Thread and the Szekeres Headamp Thread.


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PostPosted: 23 Jul 2010, 19:58 
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By the way, when you have completed your project, it would be interesting to see some pictures both during and after the build?

Of course only if you want to :D

Lewis

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