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Jules,I bypassed the 2.2uf Sonicap I used for C1 with a Relcap 0.022uf 200v TFT (dimensions 0.23" D x 0.75" L), roughly $USD 20 each at Parts Connexion. I chose that one because I wanted to mount the bypass on the foil side, under the C1 Sonicap. The TFT was small enough to fit between the GK-1 Analog PCB and the top plate of my chassis.This cap is still breaking in, but (after 100+ hours) it is sounding like it might be a keeper. My intention is to listen to music now... if the AKSAphile community finds another cap for C1 that is just wonderful, I may give it a try someday, but--in my system--a 2.2uf Sonciap ($7.60 each), possibly bypassed with a really nice smaller cap ($$$), sounds very, very nice to me.Take care,Peter
...C-19 from .01 RTX to .01 Sonic Cap Platinum teflon cap, and C-21 from 1uf Auricap bypassed with .01 RTX to .47 Dynamicap E series metallized polypropylene...
Steve,My thanks too!Darren,The substitution with a smaller output cap on the GK1 would raise the corner frequency of the bass. This is because a smaller cap would have more series impedance, reducing the amplitude of the bass frequencies more than the treble or midrange. 6dB down (half voltage) figures for feeding a 40K Zin amplifier such as the AKSA/Lifeforce would be:1uF: 4Hz470nF: 8.5HzSince 8.5Hz is low enough - the lowest bass guitar note is only 43Hz - I would say no problem at all!Cheers,Hugh
...I didn't think moving the chair would change the dull piano sound, only that something in the circuit could do that.
My GK-1 schematic shows C-21 value of .47uf, thus I figured it was okay to use the cap I had. FWIW, the 1uf DynamiCap is same price as smaller value, or nearly the same. I only used it as I had it and was curious as to the difference. A teflon cap of either .47 or 1uf is very very expensive, any brand you like and especially when bought in pairs.Again, it's all just my experience here, and the increase in sound clarity, etc. can only be from either changing the two caps, or moving my listening chair a little bit, as that's all that changed. I didn't think moving the chair would change the dull piano sound, only that something in the circuit could do that.
Here's something new on the subject of capacitors for eveyone to mull over - http://www.vhaudio.com/21capacitorshootout.pdfIt's just one person's view and opinion of course. But it seems reasonable.