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In the Forum: Melquiades Amplifier
In the Thread: Planning my DSET
Post Subject: Cap rolling...Posted by anthony on: 6/18/2015
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 Romy the Cat wrote:

As much as caps in speaker crossovers makes deference, so do they make in coupling applications. In Milq the cap is light duty as the amp never goes A2 and the cap is not change the polarity, still the coupling caps do mater a lot. I did experimented a lot with the coupling caps and I like the Electrocube 950B and MultiCaps, the last unfortunately available only by small values. I did not experimented with new German Teflon caps. I do not like oil caps, at least those that I tried. I feel that oil caps are more suitable for high current applications. Also, do not forget that in context of DSET the coupling cap behavior is kind of defend. If you need large coupling cap for LF amp that you do not care how “dry” it sounds at HF. I find that for MF and HF it is better do not have cap at all, that why in my DH channel I use DB coupling, something that I would not do for ULF….


Thanks for your insight Romy.  I can see your point about not needing to worry too much in the DSET about coupling cap performance at higher frequencies but I would imagine that the crossover filter caps are quite import at those regions though.  Have you experimented with something other than the Electrocubes there?

I ask this because the Electrocubes are not easy to get hold of and end up reasonably expensive by the time I purchase them in a quantity that they are willing to manufacture so I have looked around a little for alternatives.  Where you use film in the power supplies I am considering the Mundorf MCap Supreme film caps...they seem affordable and reasonably well regarded when used in power supplies.  Likewise I think that I will try them for the larger coupling caps.

Regarding the DSET crossover filter caps, I am thinking of using either Jupiter Copper Foil or V-Cap CuTF...they are both reasonably affordable in the small values, particularly the Jupiters.  DSET coupling caps I will probably try the Mundorf MCap Supreme film caps for a start and maybe even a small value Jupiter Copper Foil or V-Cap for the UpperBass coupling cap, just to see if there is any difference.   

I will be building the fullrange first, so I might try a few different coupling caps in it if I get enough time with it.  I have a pair of Duelund Cast 630VDC 2.2uf sitting around here somewhere that I can try as the coupling cap plus I will be able to try the much less expensive Mundorf MCap Supreme mentioned above and maybe a Jupiter Copper Foil as well.  It will be interesting to see if any of those caps seem to work well in the fullrange Milq.

Regards,

Anthony

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