about caps

[Colas LeGrippa]

Hi ! After a couple of months without coming here, I have a couple of questions/commentaries. First, I have read that in the filtering section of an amp, it was better to use caps back to back ( plus, minus minus plus ) to eliminate the polarity. It would have something to do with the tone of the amp .More, bypassing the caps with smaller ones would help with the linearity. Other point: I have bought from Angela Electronics .022 caps, copper foil in oil that cost me a fortune to a point where I am keeping them in the original shipping plastic bag avoiding to use them. I have discovered that the MOJOTONE Vitamin T caps are the best ever (I still don't know about Angela's ones). What do you think ?


Colas LeGrippa

[jjasilli]

I have read that in the filtering section of an amp, it was better to use caps back to back ( plus, minus minus plus ) to eliminate the polarity.
I have a hard time believing this would work.

bypassing the caps with smaller ones would help with the linearity.
I bypass my last filter cap in this way.  For caps in the signal path, this is called "stacking".  Haven't tried it or heard about it for years.  The full value is composed of two caps in parallel: 2/3 + 1/3 = full value.  The 2 caps are of different types.

[ChopSauce]

I have discovered that the MOJOTONE Vitamin T caps are the best ever (I still don't know about Angela's ones). What do you think ?

(somewhat sceptical:) how did you discovered that?

For what it's worth: my playing is not that much better than that of Dumble customers, which have been using standard "mojo-less" caps for ages now, to justify that I spend the extra money for those - & I think that you are ready to spend even more money with poor return over investment ratio (but I am no specialist.)

That being said, I can understand that cloners of collectible amps use caps like that, let's say for period-correctness considerations - in which case the return over investment ratio is much better -

[kagliostro]

If you can find it on the cheap get polyester big cap to be used on the PS instead of electrolytic caps
(I was so lucky at a pair of Hamfest and got some 900v that looks like the one on the attached photo at only 3€ each)

They are way more reliable, they didn't dry after some years like e-caps and they havent the large tollerance of e.caps

only they are REALLY BIG

--

Also VOX on the AC30CC2 uses small poly caps in parallel with the e-caps of the PS

I can't explain a reason, I know only it has to do with reactance

Franco

[Colas LeGrippa]

There is alot of new NP capacitors on the market and we got to be prudent not to buy the good looking capacitors because they look pretty.
I have modded the p.s. of two builds of mine with NP caps without seeing a difference. The vitamin T from Mojotone made a difference in my preamps compared to the orange drops and I like them alot.
 I am not gonna use the copper foil in oil from Angela's electronic in my builds. At 25$ each, I am pretty sure the Mojo vitamin T sound pretty much the same at 5 bucks. I haven't bought a dozen oh those, don't worry....
 The Trainwreck blues model use bypass caps to  bypass the cathode caps of the 12ax7. Obviously, I can't hear a difference, though there might be a difference on a scope.
Colas

[Colas LeGrippa]

trainwreck version A5H shows the cathode bypass caps

[shooter]

I have a hard time believing this would work.

Same, I have worked on a lot of PS's for various things and they ALL have polarized electrolytic.  I have seen it used in SS signal path, but rarely.  PRR did find some new 40ish uFs non Ecap that I am toying with as PS filter caps.  I do acknowledge not "keeping up" with all the new trends, I'm not gonna out-live the good old trends so why bother

[Colas LeGrippa]

yep, why bother. I guess I had to do the test to be convinced.