0,22 0,33 0,47.....uF

[fantacrazy]

Hi, recently in this world, let me know how it is to change the range of audio frequencies, replacing the coupling capacitors in values. in practice as a minimum value and what I can mount up, with such changes? thanks
i would like more bass, in this moment i have the 0.22 uf on 6n1-> EL34

 

[Vinylsavor]

Hi!

Assuming that the coupling cap was correctly sized from the beginning, increasing it will not give you more bass. It will move the low frequency roll off point further down.

Best regards

Thomas

 

[costis_n]

As an example, in my EL34i have 0,056 uF and it is still full range.

 

[fantacrazy]

So, increasing the value of the capacitor.. i get down or turn up the starting point of the low frequencies?
It ' a Yaqin mc-10l, is born with 0.10uF but 0.22uF recommend switching to ...
I now mount svetlana c logo el34 e nos driver, I thought I would try the el-6CA7 or el34B for more bass frequency... i have change loudspeaker in suspension, no reflex and all it's changed...
what do you thing? thanks for the help!

 

[fantacrazy]

thank you... so then there is no fixed value, we should do some listening tests ... pardon my immature competence 🙂

 

[costis_n]

You can do a little math to calculate what is the lowest frequency that will pass through the capacitor.

You will find that over 0,1 uF it makes no difference in the audiofrequencies. You must look for other ways to have more bass.

 

[fantacrazy]

K, thank you! Better 6ca7 or el34b??

 

[flatheadmurre]

Better Output transformers is the answer for most medium HIFI tube amps.

 

[Kay Pirinha]

Better 6ca7 or el34b??

It strongly depends on the voodoo philosophy you're believing in! 😀

Some say: Bigger bottles bring better bass. Or something like that...

 

[DF96]

so then there is no fixed value, we should do some listening tests

If the amp has negative feedback then there is not a straightforward relationship between coupling cap value and bass extension. Increasing cap values could cause an LF peak or motorboating. Best to assume the original designer knew what he was doing; don't believe everything you see on the internet. People who say "make the caps bigger to get better bass" rarely think about the Bode/Nyquist criteria for stability.

 

[fantacrazy]

Yes! have the feedback loop and on internet says this resistance to change also. But i understand that so better to leave everything as is but replacing with quality components. as regards the 6CA7 or el34b? Thank

 

[data]

The Yaqin mc-10l uses .1uf coupling caps, so I stuck with that value when I owned one, and a friend with one tried .22uf and .33uf and he found no difference in sound. I replaced the original caps with Mundorf silver & oil .1uf caps.

Russian 6N1P-EV tubes work well as replacements for the Chinese 6N1's, and Winged C EL34's are a good choice for output tubes.

 

[djn]

Does this hold true with SET amps as well? Normally I see .47uf or .22uf coupling caps in SET amps. However, a friend of mine gave me a 1.5uf teflon in oil cap that I will try in my new build. What might be the effect of going that high?

 

[DF96]

Possibly no change. Possibly more bass. Possibly more OPT distortion on deep bass it can't handle. Possibly more loudspeaker distortion on deep bass it can't handle. Possibly more blocking distortion when overloaded. Possibly more pickup of RF interference due to the physically larger capacitor. All engineering is a compromise.

 

[data]

Yeah, if the amp was designed well enough, then the value should be optimal.

The value is dictated by the circuit design, not the topology.

Edit: Just a general thought, not responding to anyone specifically.
(Typo)

 

[djn]

Well, since I have them, I'll use them first, then give it a listen. I can change them easy enough.

 

[data]

And then decide whether any positive difference is because of the value, of if It's the cap type attributing to the change 😉

Edit:That's a big jump from something like .47uf to 1.5uf...good luck.

 

[AndrewT]

big F = Farad
little f = femto

 

[fantacrazy]

I blew up the panic 🙂

 

[data]

Yeah, femto is used so often in audio discussions, people may be confused by the use of a small "f" in relation to uF in the context of this discussion.

But thanks for pointing out my laziness all the same 😀