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Old 27th March 2006, 01:24 AM   #1
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Default Diy Tube Phono Preamp

Does anyone know of a good tube phono pre-amp that is DIY? and preferably cheap? because I am going to try and build a stereo that is transistorless! and it is only possible if i get a tube phono preamp. Any help is extremly welcome
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Old 27th March 2006, 01:40 AM   #2
arnoldc is offline arnoldc  Philippines
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Find Kuei Yang Wang's post on El Cheapo phono stage. A couple of member have built it.
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Old 27th March 2006, 03:57 AM   #3
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This one's supposed to be pretty good:


Click the image to open in full size.

To be found on www.triodedick.com (Dutch only -check 'projects')
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Old 27th March 2006, 12:36 PM   #4
SRMcGee is offline SRMcGee  United States
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Alexmoose:

Bottlehead offers the Seduction phono preamp. I don't have one, but their Foreplay preamp was a terrific project and sounds too good to be true.

Regards,
Scott
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Old 27th March 2006, 03:03 PM   #5
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The cathode resistor of the first mu follower stage is missing!
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Old 27th March 2006, 03:33 PM   #6
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"Find Kuei Yang Wang's post on El Cheapo phono stage. A couple of member have built it."

I built this and its great.

Shoog
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Old 27th March 2006, 06:05 PM   #7
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Quote:
Originally posted by Shoog
"Find Kuei Yang Wang's post on El Cheapo phono stage. A couple of member have built it."

I built this and its great.

Shoog
I think I found it




http://www.diyaudio.com/forums/showt...?postid=335624

Here
This is the schematic

is this the illustrious "El Cheapo phono stage"?
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Old 27th March 2006, 08:50 PM   #8
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Quote:
Originally posted by alexmoose



is this the illustrious "El Cheapo phono stage"?

It's the valve El Cheapo, there is an opamp El Cheapo version.

I've built the valve El Cheapo and am well pleased with it. There is another thread started by Kofi Anan with a lot of detail on the build particularly the earthing. I found that I needed to build the psu separate from the stage as there was too much noise, but I am using a v.low output cartridge.

Kev
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Old 27th March 2006, 10:55 PM   #9
arnoldc is offline arnoldc  Philippines
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That's it alex, on my way to build mine too.
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Old 27th March 2006, 11:30 PM   #10
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Okay, I have identified the "El cheapo" (whoever dubded it that needs a metal) However being a nube to tubes, I of course have some questions that will make me look like an idiot.

What does the number mean after the resistor value in some of the resitors for example 51k1 (bottom left corner) does this imply 1 watt? resistor with a value of 51k ohms?

How much current do you think this needs? because the Hammond 269 JX provides 250v (the B+ on the schem) at 60ma for a modest $33.95 from Tubes and more is this enough?

What does the capacitor labeled "2u(mew)2" (middle right) mean? I understand way by which capacitors are rated, but what does that mean?

What does "MKP" mean?

What does "KP-SN" mean?
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