2. amps-preamps
  3. 1183509117

Bypassing capacitor caps , and caps in General

With regards to tube amps etc ...

Power Supply Filter Caps and Decoupling Caps:
Do you guys agree with the train of thought where high capcitance electrolytics are "slow" to respond to sudden quick music signals which demand a "quick" instantaneous supply of power to the tubes? I have read that bypassing with a smaller value film cap, either a 0.1 uF or a 1.0 uF + 0.01 uF can help "speed" things up. I have heard that this theory or practice is from the '80's (maybe they didn't have such good caps then) and that nowadays, it is preferrable to use good quality electrolytics (such as Black Gates) rather than just any old large cap.
Or does this apply to decoupling caps only? Decoupling caps are local power supply caps, yeah? How do these differ from large electrolytic filter caps, function wise? Don't they both do the same thing, to supply power to the tubes? Why the need of a local power supply? Seems like my TRL amp doesn't use decupling caps, but several large computer-grade electrolytics. These I believe are filter caps, rather than decoupling caps.

Signal Caps and Coupling Caps:
Similarly, bypassing is used in coupling caps too. I have read of pros and cons, and am not sure if it is worth trying. In short, I have been told that large value coupling caps have better bass, likewise with large speaker drivers. However, like the large speaker driver, it has poor high frequency. Similarly with large decoupling caps, they will have poor high frequency - hence the small bypass across it - essentially, adding a tweeter. Or you could add two bypasses to achieve a mid and a tweeter.

Black Gate Electrolytics:
Ok - these are mega expensive electrolytics and are known worldwide by enthusiasts as the best electrolytic out there. Audio Note Kondo makes very pricey gear - they don't use these for their electrolytics in the power supply. Why is that? I own a M7 phono stage and it uses what seems to me to be standard Nippon Chemi-Con caps - not Black Gates. How much improvement will Black Gates offer in comparison to the Nippon Chemi-Con caps if I was to replace these in the M7. Should I? I believe the Nippon Chemi-Con function as filter caps and are positioned around the mains input transformer.

V-Cap TFTF:
I have read too many astronomical improvements when other caps are replaces with these. I'm going to bring up Audio Note Kondo again. Has anyone replaced AN caps with these and got better results? Or even bypassing the AN caps with a V-cap. Should the V-cap be so excellent, it's a shame Kondo do not use them. Maybe they want to keep their gear 100% Japanese.

Comments and opinions appreciated.

Regards
David
linnmaster
ultrakaz
187 posts
 
I don't like messing with a chef's stew- unless I ask and they say otherwise. You might ruin the pot and void the warranty or worse. Great circuit design with cheap caps will overcome a lesser circuit with expensive caps.

Too much cap propaganda. And "bypass" is overated. The designer might carefully select "non-premium" caps for a reason. They may sound better in his circuit design and or a premium (expensive) may be indifferent or worse.

Perhaps, if I was rollin' my own I might experiment out of curiousity, which is what any thorough designer will do.
genesis168's avatar
genesis168
409 posts
 
Kondo makes his own caps. That's what he is famous for. If you put other caps into it, it will NOT be a Kondo. V-caps are a good mass market caps. I am glad you have an M7 phono. The caps inside are made by Kondo himself and they are among the best caps money can buy.

As for Black Gates, the reason it was not used in an M7 was because Kondo did not believe/liked the sound of them. It is only Peter Q from AN UK who likes to slap premium parts into all his designs.

The M7 was voiced with a particular selection of parts. That's why it's called an M7 phono.

Enjoy the piece.
gregm
3,405 posts
 
it is prefer(r)able to use good quality electrolytics (such as Black Gates)
That's correct, afa the statement goes -- I don't particularly like the BG however.

How much improvement will Black Gates offer in comparison to the Nippon Chemi-Con caps if I was to replace these in the M7. Should I?
My spontaneous answer would be, no, you shouldn't. Components specs and channel matching are much more important in a riaa than the brand name of a particular cap.
Unless you can match the replacement components to extremely tight tolerances, and have the exact value required by the particular circuit -- leave as is. (Or, ask the designer.)
More to discover