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In Reply to: RE: Favorite Silmic II film bypass? Size & Sonics? posted by Barry on December 19, 2016 at 09:05:57
Thanks all. Still learning on this and value your input.
I ended up with a mix of a very small value Panasonic polypropylene (the red ones) and a 5 x's larger CuTf V-Cap for the bypass. I traded a little detail and extension on using the V-Cap alone for a little more liquidity and naturalness (to me) by adding the Pany PP. The Panys were the original/stock 'lytic bypass in the unit at a larger value which was maybe why I liked them. Fortunately, the pairing did not seem disjointed or smeared sounding.
I was surprised at how much the small value PP impacted the overall voicing.
No science, only listening. I used solo female vocals and chimes to arrive at the values. Of course it's all system dependent and YMMV.
Happy Holidays!!!
Follow Ups:
Just know that you bypassed one of the 2 or 3 best (and most expensive) film capacitors in the world (The VCap CuTf) with a very mediocre polypropylene metallized film capacitor, which ought to be inferior to the CuTf in the high frequencies most of all. The fact that you sense an improvement with the panasonic is all that counts, however.
Crossover outputs are now V-Cap CuTfs bypasses only with no added PP bypasses. I did need to remove 2 Tx2575s in the input stage and use original resistors there to get the tonal balance right (there are 30 TX2575s in each modded XO unit). Still, lost a litle something, gained a little more of something. Like it better this way.
I've clearly reached the point of no returns on this unit after swapping out over 100 parts!
I've used the V-Cap CuTfs since they first came out and , yes, one of the best. They seemed to be missing something in this specific application. It's possible "the problem" is elsewhere, but this has already been a very lengthy experiment.
I did lose just a little air and extension in the highs, but I got the sound I was looking for.
I relearned some lessons. Don't change too many parts at once! Changing something in one place could require rework in another for voicing balance. It's possible a "best part" may not work perfectly for every location. There are always trade offs.
Thankfully everything's been so heavily modified there's not much left to upgrade and it all sounds pretty good.
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