Can I get away with 250V cap in Cornet2?

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REY

Can I get away with 250V cap in Cornet2?
« on: 30 Apr 2009, 01:22 am »
Instead of the recommended 400v for C200, C206, C208 and C203? Thanks, by the way I was shocked when I saw the size of this board, I always had the idea it would be much smaller, can't wait to wait to get this thing done!

galyons

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Re: Can I get away with 250V cap in Cornet2?
« Reply #1 on: 30 Apr 2009, 05:50 am »
Hi,
If you deviate from the parts as specified, you do so at your own risk. You can review the schematic and determine the voltages at each cap.

What are you trying to accomplish?

C200 & C206 bypass the B+ 'lytics. They are seeing approximately 300-330VDC.  C203 and C208 are in the signal path and seeing about 150VDC.

It really depends on the caps that you are considering.  If they are known "overachievers", such as Russian K40's. May not be an issue.  If they are Jupiter's, well you may like the smell of burning beeswax!

Give us some more details! 

Cheers,
Geary

REY

Re: Can I get away with 250V cap in Cornet2?
« Reply #2 on: 30 Apr 2009, 12:48 pm »
I was thinking about using erse caps from DIY audio, decent caps for really really cheap but I guess you are right, I guess I will go with the recommended auricaps! thanks!

avahifi

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Re: Can I get away with 250V cap in Cornet2?
« Reply #3 on: 30 Apr 2009, 01:39 pm »
I strongly urge you NOT to use capacitors rated for lower voltage than the voltages in the particular circuit produces.

The sonic benefits are overwhelmed by the sound and light and smell show of "flash, bang, spark, cloud of smoke", and the stench as the over-voltaged capacitors go up like overstressed Dilithimum Crystals from the Star Trek warp drive.

Which brings me to a question.  Since they lost those darn Crystals so often, why didn't the carry a whole lot more spares?

Best regards,

Frank Van Alstine

avahifi

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Re: Can I get away with 250V cap in Cornet2?
« Reply #4 on: 30 Apr 2009, 01:41 pm »
I strongly urge you NOT to use capacitors rated for lower voltage than the voltages in the particular circuit produces.

The sonic benefits are overwhelmed by the sound and light and smell show of "flash, bang, spark, cloud of smoke", and the stench as the over-voltaged capacitors go up like overstressed Dilithimum Crystals from the Star Trek warp drive.  You also then get to pick out the debris and goo showered inside the chassis and find what else failed too.

Which brings me to a question.  Since they lost those darn Crystals so often, why didn't the carry a whole lot more spares?

Best regards,

Frank Van Alstine

REY

Re: Can I get away with 250V cap in Cornet2?
« Reply #5 on: 30 Apr 2009, 02:48 pm »
Ok, Ok, I got you, thanks again!

galyons

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Re: Can I get away with 250V cap in Cornet2?
« Reply #6 on: 30 Apr 2009, 03:53 pm »
Rey,
Do some searches on the caps folks have used.  It really depends on the sound characteristics that you desire.  I  do not like the sound of metallized polyprop's, I prefer paper-in-oil.  My system is balanced to the sound of PIO caps.  "There is a seat for every butt!" There are many inexpensive and expensive, and everything in between, cap alternatives. Take advantage of the experiences on this board. 

You will find the group here very willing to share.  The C2 board is a work of art with a vast potential to customize the sound to your system and liking.

What are you looking to accomplish with the build of the C2?

Cheers,
Geary

REY

Re: Can I get away with 250V cap in Cornet2?
« Reply #7 on: 30 Apr 2009, 11:58 pm »
I am not new to Hagerman toys, I have built a Hagusb, a bugle with its power supply ( that my brother now owns) I know the great value that these kits represent, I try to be realistic and I dont think that my humble system (rega planar 2, audiotechnica 150MLX, Jolida amp and AV1 GR research speakers) can really tell the difference between a super expensive cap to a moderate one. I already place an order for sonicaps, (+$90 auchhh!) That's the caps recomended by Danny from GR research and that are the caps that my speakers use, so there you go.

tubesforever

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Re: Can I get away with 250V cap in Cornet2?
« Reply #8 on: 1 May 2009, 07:01 am »
Rey,

If you look over the schematic really close you will see that the 47 uf 450 v B+ caps are being bypassed with 1.0 uf film caps (Auricaps if you upgrade or Panasonic orange drops if you build it completely stock).

The film cap's basic contribution is to bring out the highs and sound stage information while the electrolytic carries the weight.

I am using Panasonic ED caps which are being replaced with the EE caps.  I understand the EE caps are actuallly an improvement to the design.  The ED caps are very low esr models and are nearly as silent as the Blackgate caps. 

These are cheap too.  I think they were around 3.00 to 4.00 per cap.  I can highly recommend them.  They are silent and they are ultra smooth.

Now for the bypass caps, I would recommend the Auricaps, or Dynamicaps, or SonicCraft caps.  I bypass these with a Russian FT-3 0.10uf teflon cap to get more dynamics and clarity.  The results are nothing short of flat out amazing!

Cheers!

hagtech

Re: Can I get away with 250V cap in Cornet2?
« Reply #9 on: 3 May 2009, 02:45 am »
Quote
why didn't the carry a whole lot more spares?

Aren't they unstable when not in a reactor field?

jh