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Old 27th August 2008, 05:26 AM   #1
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ostripper's Avatar
Join Date: May 2008
Location: Smoky Mountains , Tennessee
Default Want to build a tube/SS hybrid preamp for HT

I,m a noob at tubes, so I'm looking for suggestions on a
low cost unit with the following attributes.

1. Small and inexpensive..self explanitory.(small rack mount)

2.Input will be PC sound card. (do not even have a CD
or DVD player .)all MP3/flac- AVI/DIVX for video.(50,000)

3.Output is to high powered Quasi MOSFET amps.
(30k impedance).

4.Hybrid is preferred because I'm going to make it's
volume remote controlled.

5. Simple, because all post processing is done by the
PC/sound card. (just a on/off switch, volume, and IR
receiver.no tone controls.)

6. Safe, for my 1200$ PC and DIY amps.(don't want HV
B+ to fry my current setup.)

7.I might want it to be my headphone amp as well.

The reason I want to go this route is because of the "classic"
tube sound I hear about and the outright novelty of this

Any suggestions would be highly appreciated.

Thanks in advance,OS.
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Old 27th August 2008, 04:42 PM   #2
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Join Date: Jul 2006
Let me get this straight;

you want it to be hybrid, you but also want it to be simple? those sound like rather conflicting requirements.

John Broskie will sell you a very high-quality Aikido PCB (or even a whole kit) that's just fine for building yourself a preamp of this nature. The volume control, however, will be up to you. I myself can vouch for the the quality of the Aikido kit, but it's really more of a starting point than anything else.

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Old 27th August 2008, 05:27 PM   #3
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I have an answer in my avatar. However, not every hybrid amp does such things, but mostly people use tube pre with traditional SS output stage combining worses of 2 worlds.

Take an Aikido board as suggested, and add one FET source follower loaded on a CCS. You will be surprised how good is sound, though power consumption will be huge.

The Devil is not so terrible as his math model is!
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Old 28th August 2008, 01:02 AM   #4
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Location: Smoky Mountains , Tennessee
The Aikido board it is, I will google it.
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Old 28th August 2008, 01:20 AM   #5
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Location: Smoky Mountains , Tennessee
Is this the board ??


And it,s schematic.?
nice looking board, have you ever heard one?

Can I make/use my own fully solid state combo 300V B+/heater
board with this board or is the b+ already on this board?

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