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post #736 of 2221

What value of the opamp psu caps you guys using? Since I can't find any good caps valued at 100uF 16V could fit in, I am wondering any of you actually not using a 100uF 16V value?

post #737 of 2221
Quote:
Originally Posted by goldkenn View Post
 

What value of the opamp psu caps you guys using? Since I can't find any good caps valued at 100uF 16V could fit in, I am wondering any of you actually not using a 100uF 16V value?

 

Do you mean the two big red Wima caps for opamp or the Fuhjyyu's RVT caps for the supply line? I am only planning to tinker with the opamp caps myself. Desoldering SMD caps is a bit too much for me.

post #738 of 2221

I am hearing good things with the board left stock. I agree desoldering the SMD caps. Although I have done it many time, if you lift the trace and mess it up then you have a can of worms and have to start making jumpers. The two red Wimas don't present the same problem but you still want to be careful. I have worked on some gear that had really think traces and they held up to many changes but some traces do not. 

post #739 of 2221
Quote:
Originally Posted by jamato8 View Post
 

I am hearing good things with the board left stock. I agree desoldering the SMD caps. Although I have done it many time, if you lift the trace and mess it up then you have a can of worms and have to start making jumpers. The two red Wimas don't present the same problem but you still want to be careful. I have worked on some gear that had really think traces and they held up to many changes but some traces do not. 

 

I'm relatively new to circuit boards (other than the relatively robust ones used in the Bottlehead kits) so I'm reluctant to replace the Wima caps unless I know it's going to be a good upgrade. Has anyone tried replacing them with the provided caps or can anyone tell me what I might expect?

 

I'm happy to do it once I know it's worthwhile, but I don't want to do it and then have to undo it because that will mean more soldering and more chances of causing damage. I'm probably being overly cautious, but I really like this amp and would prefer not to "overdo it" and risk damage.

post #740 of 2221
Quote:
Originally Posted by Loquah View Post
 

 

I'm relatively new to circuit boards (other than the relatively robust ones used in the Bottlehead kits) so I'm reluctant to replace the Wima caps unless I know it's going to be a good upgrade. Has anyone tried replacing them with the provided caps or can anyone tell me what I might expect?

 

I'm happy to do it once I know it's worthwhile, but I don't want to do it and then have to undo it because that will mean more soldering and more chances of causing damage. I'm probably being overly cautious, but I really like this amp and would prefer not to "overdo it" and risk damage.

 

'Worthwhile' might be less precise a way to determine as some opamp benefit more from bigger caps while some benefit less. The way I see it, just a little overdoing is fine, so I am going to use the same rating (as Tonerex) for the Silmic II replacement. The space is limited anyway, so I don't think 100uF can fit inside. 33uF is probably max for most caps as the stock Wima is 7.2mm x 13mm and it is just about to hit the ceiling.

post #741 of 2221
Quote:
Originally Posted by ClieOS View Post
 

 

'Worthwhile' might be less precise a way to determine as some opamp benefit more from bigger caps while some benefit less. The way I see it, just a little overdoing is fine, so I am going to use the same rating (as Tonerex) for the Silmic II replacement. The space is limited anyway, so I don't think 100uF can fit inside. 33uF is probably max for most caps as the stock Wima is 7.2mm x 13mm and it is just about to hit the ceiling.

 

Sorry. I was unclear. What I meant is, would changing the Wimas for the supplied Elna / Tonerex caps yield much difference? Is it worth the slight risk of damaging the PCB?

post #742 of 2221
Quote:
Originally Posted by Loquah View Post
 

 

Sorry. I was unclear. What I meant is, would changing the Wimas for the supplied Elna / Tonerex caps yield much difference? Is it worth the slight risk of damaging the PCB?

 

The main function with those caps is to provide a reservoir so when the opamp draws power from the supply line, the voltage / current won't drop too fast and cause performance drop or increase noise. Obviously different opamp will have different requirement on how much / how fast power draw and therefore some will benefit more from a bigger reservoir. So there is no one answer to say whether just how much difference it will make, since the result is opamp dependent. You might find one opamp benefit very little from bigger caps but another yield great result. Since most of us do roll opamp, I think a bit more won't hurt, especially since some of the opamp we used are known to be demanding. However, if you are happy the way your E12DIY currently sounds, I think you will be fine leaving the stock alone. Compared to opamp and buffer, I would think caps are more of a minor tweak.

post #743 of 2221
Quote:
Originally Posted by ClieOS View Post
 

 

The main function with those caps is to provide a reservoir so when the opamp draws power from the supply line, the voltage / current won't drop too fast and cause performance drop or increase noise. Obviously different opamp will have different requirement on how much / how fast power draw and therefore some will benefit more from a bigger reservoir. So there is no one answer to say whether just how much difference it will make, since the result is opamp dependent. You might find one opamp benefit very little from bigger caps but another yield great result. Since most of us do roll opamp, I think a bit more won't hurt, especially since some of the opamp we used are known to be demanding. However, if you are happy the way your E12DIY currently sounds, I think you will be fine leaving the stock alone. Compared to opamp and buffer, I would think caps are more of a minor tweak.

 

Thanks for the response - very helpful!!

post #744 of 2221
Quote:
Originally Posted by ClieOS View Post
 

 

Do you mean the two big red Wima caps for opamp or the Fuhjyyu's RVT caps for the supply line? I am only planning to tinker with the opamp caps myself. Desoldering SMD caps is a bit too much for me.

~The Fuhjyyu's RVT caps for the supply line, since from post #718 I read "Its a really good improvement to change the opamp psu caps", I though you guys have found something fit inside E12 DIY, for the WIMA caps, which were signal coupling, I already changed to BG NX Hi-Q 47uF 6.3V.

post #745 of 2221
Quote:
Originally Posted by goldkenn View Post
 

~The Fuhjyyu's RVT caps for the supply line, since from post #718 I read "Its a really good improvement to change the opamp psu caps", I though you guys have found something fit inside E12 DIY, for the WIMA caps, which were signal coupling, I already changed to BG NX Hi-Q 47uF 6.3V.

 

You are right. I took some measurement off the Wima pins and indeed they are decoupling caps. In that case I might not replace them with Silmic II after all (though I reckon it still make for a really good choice). Maybe some polypropylene caps instead.

post #746 of 2221
Quote:
Originally Posted by ClieOS View Post
 

 

You are right. I took some measurement off the Wima pins and indeed they are decoupling caps. In that case I might not replace them with Silmic II after all (though I reckon it still make for a really good choice). Maybe some polypropylene caps instead.

 

As far as I know, no through hole mounting polypropylene caps up to 2.2uF are as small size as Wima, and these Wima are not polypropylene of course, box type through hole 5mm pitch polypropylene caps which small enough to fit inside E12 only up to 0.xxuF value.

post #747 of 2221
Quote:
Originally Posted by goldkenn View Post
 

 

As far as I know, no through hole mounting polypropylene caps up to 2.2uF are as small size as Wima, and these Wima are not polypropylene of course, box type through hole 5mm pitch polypropylene caps which small enough to fit inside E12 only up to 0.xxuF value.

 

What a shame :(

 

BTW, won't 6.3V caps a bit too low when E12DIY is in high gain?


Edited by ClieOS - 1/30/14 at 8:00am
post #748 of 2221

Hey everyone,

 

Are there any of these still available for purchase?

 

Cheers!:beerchug:

-HK sends

post #749 of 2221

I don't think so, since it is input coupling caps, most LO source maximum level only at 2V, if you have a source with output level over 6.3V which powerful enough to blow the caps away, your source already powerful enough to blow most headphone away, no need for a HPA.

post #750 of 2221
Quote:
Originally Posted by HK_sends View Post
 

Hey everyone,

 

Are there any of these still available for purchase?

 

Cheers!:beerchug:

-HK sends

If you are from Hong Kong, check Taobao

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