Switches on Aleph Ono with Grado - diyAudio
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Old 16th August 2007, 06:32 PM   #1
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Default Switches on Aleph Ono with Grado

Currently, I only have the MM part of the Ono soldered but plan to populate the MC section as well and give the Grado Statement a try.
http://www.gradolabs.com/product_pages/statement.htm

The Ono can be set for a variable impedance of 10 to 1000 ohm but the cartridge needs an input load of 47k.

Im a bit confused on how to set the switches or do I solder a 47k resistor in?
Perhaps I dont need the MC input at all, given the high gain of the Ono in MM mode.
I found a post that might indicate that the previous is valid:
http://www.diyaudio.com/forums/showt...7218#post27218

Also, are there any particular tweaks possible to perfectly mate the Statement to the Ono?

/Hugo
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Old 16th August 2007, 07:20 PM   #2
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The Statement is my favorite cartridge. I am running it with the
X-ono MC input with 47 Kohm, and it's perfect.

To get 47 Kohm, simply disable all other load values - 47 Kohm
is the default.

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Old 16th August 2007, 08:26 PM   #3
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Of course I overlooked R31, 47k.
Saves me a switch.
Does the input stage benefit from matched FETs?
I have the -BL on the shelve.

/Hugo
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Old 16th August 2007, 08:55 PM   #4
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Ignore.
Manual says 'Matched'.

/Hugo
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Old 17th August 2007, 09:51 PM   #5
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It says that, but in point of fact it is only necessary to confirm
Idss numbers.

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Old 18th August 2007, 06:49 AM   #6
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It appears they are all from the same lot so i guess they will do fine without matching then.
Is there any advantage in paralleling even more devices?
I happen to see Sansui using six in a row in the AU-919 MC section.
In other words, what determines the amount of FETs?

/Hugo
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Old 18th August 2007, 08:31 PM   #7
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More gain, less noise.

Grey
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Old 18th August 2007, 08:58 PM   #8
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There has been an article about the noise cancellation when using parallel input devices.
In theory the noise halved every time the number is doubled, in real life it is a little less, about 5,4dB
If I remember correctly, the conclusion was that 4 in parallel has optimum efficiency (cost) 8 in parallel make sense.
Going beond like 16 or 32 would only add very little to noise cancellation.

I can send you the article if you are interested.
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Old 18th August 2007, 09:07 PM   #9
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Thanks Grey.

Tarasque, I'm interested. Or you could try posting it here for all to read.
hugorx . hotmail

/Hugo
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Old 23rd August 2007, 06:49 AM   #10
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Hi Hugo,

when using the BL version you cant use the highest gain setting. Be sure to disable that.
The cause is the Idss that is too high causing a voltage drop higher as the cascode voltage.

It is no problem as such. Mine also runs with BLs.
Matching them is no big deal and I would do this because they do vary quite a lot. Ive measured Idss and Vp and drew the (theoretical) Vgs/Id lines. Then used the ones that matched best.

William
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