hello people
i have been upgrading my t2020 tripath very slow.
i'm running it on a smps psu for the last two years, it is a skynet 8080
i have been placing sanyo caps all over the t2020, and it does make a
serious (read hearable difference).
i was always reluctent to remove the input caps, because of fear of blowing up my speakers and the amp.
But here are my questions.
1)
a)i keep an dc coupling input capacitor. I have a 50kohm pot, i suppose that a 1uf - 2.2uf is good enough, knowing that my speakers are fullrangers and don't go much lower then 40hz.
b)i would buy a jantzen superior cap, obligato film oil or clarity dtac cap
these are still not to expensive and good.
2)
a) i give up the input cap. but can someone describe to me what has to be done then ? and what are the conditions you can do it.
i thought that the power supply ground and the signal ground may not be mixed. In the T-amp that is easy to do, but you could make this connection in other devices where the signal ground is attached to the power ground. But all the other devices i use (tuner, DAC) have no power ground or earth connection: so i suppose that this is not an issue then ?
(summarized: my tripath is grounded, and no other device connected to the amp may be grounded (well as the signal and ground is connected in this device). )
am i correct in this opinion ? if so i can loose the input caps without a problem.
b)can anyone explain me what to do when removing the input caps, the inputs have to be soldered to some pins, i think but i can't remember which.
thank you so much.
greetz
ps: i might build a 5v line for seperate power to the t2020,
but if i do that, i'm gonna loose the smps and build an analog psu, what do you think?
greetz again
i have been upgrading my t2020 tripath very slow.
i'm running it on a smps psu for the last two years, it is a skynet 8080
i have been placing sanyo caps all over the t2020, and it does make a
serious (read hearable difference).
i was always reluctent to remove the input caps, because of fear of blowing up my speakers and the amp.
But here are my questions.
1)
a)i keep an dc coupling input capacitor. I have a 50kohm pot, i suppose that a 1uf - 2.2uf is good enough, knowing that my speakers are fullrangers and don't go much lower then 40hz.
b)i would buy a jantzen superior cap, obligato film oil or clarity dtac cap
these are still not to expensive and good.
2)
a) i give up the input cap. but can someone describe to me what has to be done then ? and what are the conditions you can do it.
i thought that the power supply ground and the signal ground may not be mixed. In the T-amp that is easy to do, but you could make this connection in other devices where the signal ground is attached to the power ground. But all the other devices i use (tuner, DAC) have no power ground or earth connection: so i suppose that this is not an issue then ?
(summarized: my tripath is grounded, and no other device connected to the amp may be grounded (well as the signal and ground is connected in this device). )
am i correct in this opinion ? if so i can loose the input caps without a problem.
b)can anyone explain me what to do when removing the input caps, the inputs have to be soldered to some pins, i think but i can't remember which.
thank you so much.
greetz
ps: i might build a 5v line for seperate power to the t2020,
but if i do that, i'm gonna loose the smps and build an analog psu, what do you think?
greetz again
1. a) The input stage of that amplifier is an inverting op amp. That means, the high-pass filter will be determined by the capacitor and Ri. The potentiometer should be before the capacitor to avoid interference with the gain setting.
2. a) If you skip that capacitor, you need some additional kind of DC protection for your speakers. You should also analyze all sources as to the effect their impedacnes will have on the inverting input stage.
The input capacitor does not help with grounding issues. It is there to isolate the different biasing potentials of source and amplifier, which means it blocks DC. Any DC from the source would be amplified and could lead to the destruction of your speakers without that capacitor or additional DC protection.
Your sources are pretty likely grounded. A tuner is usually even earthed through its antenna connection. Sources with floating ground are usually battery-driven, e. g. portable MP3-players.
b) Replace the capacitor with a jumper, if you decide to skip it.
2. a) If you skip that capacitor, you need some additional kind of DC protection for your speakers. You should also analyze all sources as to the effect their impedacnes will have on the inverting input stage.
The input capacitor does not help with grounding issues. It is there to isolate the different biasing potentials of source and amplifier, which means it blocks DC. Any DC from the source would be amplified and could lead to the destruction of your speakers without that capacitor or additional DC protection.
Your sources are pretty likely grounded. A tuner is usually even earthed through its antenna connection. Sources with floating ground are usually battery-driven, e. g. portable MP3-players.
b) Replace the capacitor with a jumper, if you decide to skip it.
thanks a lot pacificblue,
but maybe i don't understand not everything
so the input cap is there to block dc from the sources, i'm shure there is no dc on the source.
but there is something else ? the grounding issues ? they have nothing to do with the input cap ? (i don't get it completely)
a long story short: it would be better to use a very high end film cap in that place?
(i just wonder how the new version of the charlize ta2020 without cap is working so well, i mean you must use is with a battery, or battery dac to make it work ?)
thanks
but maybe i don't understand not everything
so the input cap is there to block dc from the sources, i'm shure there is no dc on the source.
but there is something else ? the grounding issues ? they have nothing to do with the input cap ? (i don't get it completely)
a long story short: it would be better to use a very high end film cap in that place?
(i just wonder how the new version of the charlize ta2020 without cap is working so well, i mean you must use is with a battery, or battery dac to make it work ?)
thanks
The type/brand of your amp is unknown but I assume it is a ready made one with 5 mm pitched electrolytic input caps. In that case I would either use a decent 5 mm pitch film cap like Wima MKS2 ( no, they are not as evil as I often read, although they're MKT ) which sound better than electrolytic caps in most cases.
Even better : good old BG N series 4.7 uF. The latter are out of production for years now and thus they're hard to find but they're no doubt the best in that size.
If you are the kind of guy that uses car battery sized caps in amps that are smaller than the caps I can not advise you too well
I also have read that the TA2020 can be used without input caps. I think it was Leo of the Charlize amps that found some way.
http://diyparadise.com/web/index.php?option=com_content&task=view&id=21&Itemid=5
Please check the negative side effects also !
Even better : good old BG N series 4.7 uF. The latter are out of production for years now and thus they're hard to find but they're no doubt the best in that size.
If you are the kind of guy that uses car battery sized caps in amps that are smaller than the caps I can not advise you too well
I also have read that the TA2020 can be used without input caps. I think it was Leo of the Charlize amps that found some way. http://diyparadise.com/web/index.php?option=com_content&task=view&id=21&Itemid=5
Please check the negative side effects also !
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When very large caps are used mechanical strength is compromised and it looks messy with melt glue, iron wire and cello tape.... Stray RF creeping in, coupling of output and input signals. Not my cup of tea. Well built and good sound go hand in hand.
Why bother if there is already a good Wima type in it ? Check the link, Leo is fond of BG N series too in TA2020 amps. No other series of BG can be recommended at that spot, just the N series !
Why bother if there is already a good Wima type in it ? Check the link, Leo is fond of BG N series too in TA2020 amps. No other series of BG can be recommended at that spot, just the N series !
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