CurtPalme.com Home Theater Forum

[Nashou66]

gjaky is right speed is very important in these PJ's Just like in Audio. I have in this past year e-mailed and also another forum member sent me an email where Chris talks about Caps. The Best for any frequency range with increase in heat as well is still the wet Tantalum. But for most it is far too expensive. he did extensive tests with higher frequencies than the manufactures list on the data sheets. He he also worked with some of these cap engineers who say there is no flatter cap over a wide heat and frequency range.

I think in order the best caps are still Wet Tant's then High quality Film caps, OsCons, dry Tants then electrolytic( but some do work better then Dry tants) so id say for Dry Tans and lytics it would be a tie. Finding the correct type for the Application is key.

If I had a few k to blow id buy all Wet's.

Athanasios

[gjaky]

[macgyver655]

I smell a cap debate brewing....... don't make me respond!!!!!

[Nashou66]

[mp20748]

[mp20748]

[stridsvognen]

I think everyone can put whatever they like, and like is as much as they want.. I think the only way to find out whats best is to test them all.. in all possible combinations. Specs say something, and engineers know a lot but not everything.They are often blinded by what they know. Let your eyes and ears decide.

There is more to it than is written or can be measured.

[dvh99]

what`s with the wood?

[stridsvognen]

[stridsvognen]

Here is my boards with new caps. Maybe ill try others in the future, but not while i just have 1 set of boards.

[draganm]

great, another raging capacitor argument, or soon will be.
What the hell is it about capacitors anyway that make people so emotional? The only other thing that brings up as much passion in people is speaker cables. At least capacitors have some technical merits vs. arguing about how a cable sounds LOL
Like was said earlier, if you look at capacitors from the 90's and what's being made today there is no comparison, today's high quality stuff makes the old parts look like junk. Your getting high temperature caps rated 10K hours for 30 cents a piece in 2012 dollars, that's amazing.

Also, most of our machines were built in the 90's and they have thousands or tens of thousands of hours on them, if you have some basic skills with a Soldering iron it's hard not to improve them .So Now for the really hard part HAVE FUN

[Nashou66]

In any old electronics equipment putting in new caps will help, to some degree. Some of the old caps might be fine but not be as good a performer as a new one. Depends on where and what your after. Now regarding new cap testing of ESR, i am NOT 100% sure but I remember reading that they only test at either 1k or 10k frequencies and interpolate the higher frequencies. In that reading there was a Cap engineer who admitted that over about 100k that the ESR increases dramatically. That he tested this on many lytics . Also Chris Stevens tested all sorts of caps at frequencies up to 1 ghz and that wet tants held the flattest esr . In a recent e-mail he stated

Wet Tant... These caps are by far the lowest ESR of any large value cap known to man. They have a extremely flat ESR to a very wide freq range. They have very low drift with temp. There really is no substitute. ANY wet tant will do. No brand is much different from another for this application. The various types of wet tant will all work in this application. Go for cheapest for the values needed... The bad news is they are horrifically expensive. No substitute reguretfully.

I trust his expertise. And it seams from his comment "known to man" he has looked at newer offerings out there.


Athanasios

[draganm]

[Nashou66]

back to Wet Tant's. Now I have done some research and there were a few papers written that compared Aluminum Electrolytic to Wet Tantalums. Depending on a few things you have to decide what to use. They say wets perform better in cold situation and Lytics better in hot esr wise and frequency wise. Now having said that this was done in test situations with a static frequency up to 500khz. Speed of the caps were not tested and that is what I think we need here especially on the Vertical board according to Chris. Keeping the lines drawn in the correct place at each line shift is key to resolution on the tube face, this is similar to what ken Hottie rationalized with the CLM upgrade I show in the Marquee thread. So how these caps perform in situations where the transients of the power requirements change as the amps draw the lines. Chris explains it much better than I do but you get the idea. How fast they are matters to accommodate those transients. I tried looking for speed of caps but only came up with some articles on Black Gates. I know those from their own literature claim faster response times. I also think caps have character traits like Gjaki states for Audio, would there be possible characteristics to Video? In Audio I think it is subjective but with video it can be measured. So who I willing to spend $$$ for a wet tant re cap of the Vertical board and HVPS?

Nashou

[dvh99]

wouldn`t it be cheaper to bypass those lytics with small value filmcaps (cog or pp).

[stridsvognen]

[kabuby77]

ESR is not a problem with the signals, because it is constant, you should be more careful to ESL. The best choice for decoupling hf signals are polypropylene capacitors . They are stable with low tolerances, usually constructed as anti-inductive, unfortunately, are cumbersome. However for the same capacity they can have a esr tens of times lower than those with tantalum.

[stridsvognen]

I think this is starting to be fun..

If possible, lets just concentrate about the 9500 VIM, and when someone like some special caps with special specs or whatever. Try explain what different it made on the image on screen, possibly show it with screen shots.

There is plenty of religion with caps. and everyone have some feature they like to point out.. Not many really seems to consider all the abilities of the cap.

If no one want to put words to whats going on with the image, please make a link to your favorite cap to be mounted on the VIM, and with time i might go try it, and share my opinion.

[kabuby77]

You can find a right cap for every application you need, but there isnt a cap right for all.

[mp20748]