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Which input capacitor for clone Grado Ra1

post #1 of 10
11/24/11 at 7:46pm
Thread Starter 

It's hard for me to find the original 4.7uf solen for this amp. Can i use this instead of the original capacitor? Will it sound worse?

WIMA_MKP10_4.7uF_160V_o.jpg

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post #2 of 10
11/24/11 at 8:02pm

I suspect it will sound just fine.

 

More importantly, what was the voltage rating for the original capacitor? What model of Solen?

 

The WIMA In the picture might be a bit overkill for your application in terms of power handling.

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post #3 of 10
11/24/11 at 8:03pm

Partsconnexion has Solen caps, and many others. 

 

You dont *need* 4.7uf caps for the RA-1 clone. You can go much smaller and still get a very low -3db corner frequency. 

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post #4 of 10
11/24/11 at 8:12pm
Thread Starter 
Quote:
Originally Posted by jdkJake View Post

I suspect it will sound just fine.

 

More importantly, what was the voltage rating for the original capacitor? What model of Solen?

 

The WIMA In the picture might be a bit overkill for your application in terms of power handling.


The original is 4.7uf 400V, it look like this:

solen_630_7.jpg

 



Quote:
Originally Posted by nikongod View Post

Partsconnexion has Solen caps, and many others. 

 

You dont *need* 4.7uf caps for the RA-1 clone. You can go much smaller and still get a very low -3db corner frequency. 


But i can't find these caps any where in my country frown.gif

 

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post #5 of 10
11/24/11 at 8:15pm

These are on ebay

 

http://www.ebay.com.au/itm/Audiophiler-MKP-4-7uF-400V-DC-audio-grade-capacitor-1pr-/220768429616?pt=LH_DefaultDomain_0&hash=item3366d2e630

 

cheers

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post #6 of 10
11/24/11 at 9:28pm
Thread Starter 

After some research i think these capacitors are good enough, i will go for it. 

Another question: if i change the 465k and 122k resistors in the feedback loop to 5k and 1k and the volume from 100k to 10k, does it affect the sound?

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post #7 of 10
11/24/11 at 9:37pm

Have a go with these calculators from Tangents

 

http://www.tangentsoft.net/audio/calc.html

 

interesting to play with :-)

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post #8 of 10
11/25/11 at 12:25am
Quote:
Originally Posted by proid View Post

After some research i think these capacitors are good enough, i will go for it. 

Another question: if i change the 465k and 122k resistors in the feedback loop to 5k and 1k and the volume from 100k to 10k, does it affect the sound?



there will be slightly higher voltage noise with the higher value resistors, but less current noise, whether you can effectively use a 10k pot will depend on the output impedance of the source you are driving it with

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post #9 of 10
12/23/11 at 4:15am
Thread Starter 

So in the end, i have done the RA1 with very good result but i prefer the sound of it using SCR MKP 4.7uf/400V better than the original Solen MKP 5uf/400V which is more expensive. But when i using a switch, when i turn it on, there are no problem but when i turn it off, i have clicking sound from my headphone and i mesure between the ground and right, left channel, it was 9V!!! I don't know what's the problem?

 

M0tth.jpg

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post #10 of 10
12/24/11 at 5:17pm

You need a dual-pole switch to break the connections from both batteries. You can leave the ground connection unbroken, but you must switch both the positive and the negative connections. A dual-pole switch is 2 switches built in the same package and operated by the same lever.

 

w

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