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  1. #181
    Join Date: Feb 2008

    Location: South Wales

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    I'm NotTakingLifeTooSeriouslyTheseDays.

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    The Yaqin 100B is indeed a lot of amp for the money, and there are 230v versions, however; many of them coming in are designated for 220v, even then after testing; it was found that they only needed around 210v on them for the secondary voltages to be correct!
    Hope this helps.
    A...
    "Today scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality"
    Nikola Tesla



    We Send our kids to school to be Educated, not Medicated!

  2. #182
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

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    I'm AudioAl'sArbiterForPISHANTO.

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    Remember the Yaqin, Anthony, and what later turned into a full 'Tube Distinctions for AoS' amp? It was rather good, wasn't it?

    Marco.
    http://www.thestainedglasscompany.com

    "A man is a success if he gets up in the morning and gets to bed at night, and in between he does what he wants to do" -- Milan Kundera.

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  3. #183
    Join Date: Feb 2008

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    Of course, and as you say; they can be made into something very good indeed, but its not just a case of swapping components etc, the ones I modded I altered the circuitry too!
    Quote Originally Posted by Marco View Post
    Remember the Yaqin, Anthony, and what later turned into a full 'Tube Distinctions for AoS' amp? It was rather good, wasn't it?

    Marco.
    "Today scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality"
    Nikola Tesla



    We Send our kids to school to be Educated, not Medicated!

  4. #184
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

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    Yup, and because you essentially had the basis of something good to work with, the finished product turned out really well

    Marco.
    http://www.thestainedglasscompany.com

    "A man is a success if he gets up in the morning and gets to bed at night, and in between he does what he wants to do" -- Milan Kundera.

    BE HAPPY EVERYDAY!

  5. #185
    Join Date: Feb 2008

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    Quote Originally Posted by Marco View Post
    Yup, and because you essentially had the basis of something good to work with, the finished product turned out really well

    Marco.

  6. #186
    Join Date: Apr 2015

    Location: Central Virginia

    Posts: 1,267
    I'm Russell.

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    Here I am late to the party yet again!

    I want to drop back to the talk about Rise Time and Slew Rate. I didnít read where anyone gave an accurate description of them. So hereís my two cents.

    Both of these measurements are not so much about the output stage, as how you feed the output stage. And why two amps, both claiming the same watts, and even having the same output transistor compliment, sound different. (I wonít comment on tubed gear, not my area)

    Rise Time is how long it takes to bring the output up to spec, so when a sudden transient happens, how quickly can it be ready for the next one.

    While Slew Rate measures the decay, how able is the amp to maintain a transient. A sharp pop of a snare drum, the amp delivers the specified power to the speaker, but it canít keep it up forever, the voltage drops off over time. An amp that claims 25V/us, is a very good amp. Meaning, after the transient, the amp is unable to keep up, it loses 25 volts per microsecond. And another 25 volts every microsecond after that, until it runs out of power. Compared to an amp that claims 150V/us, this can make a very audible difference! The snare pop dives off much faster in the second amp, smearing the decay, then Rise Time brings the output back to full potential before the next one. A slow rise time can cause subsequent drum whacks to be Lower than the one before, if it isnít rising fast enough to keep up. Both are more about the power supply, the capacitive storage for the output stage, and why two amps that both claim 100wpc can perform extremely different.

    If you want a good tube amp, buy it by the weight! The heaviest one has the biggest transformers. Iím not sure the exact correlation between amps and weight, but the amp I own now is the heaviest one Iíve ever owned, and the best sounding. Just lucky maybe?

    Russell

  7. #187
    Join Date: Oct 2016

    Location: Bolton, England

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    I'm Andrew.

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    Sorry Russell, that's just wrong. Slew rate is the speed at which the output can move. However, you're right that it's measured in volts per microsecond, but the stuff like "...after the transient, the amp is unable to keep up, it loses 25 volts per microsecond. And another 25 volts every microsecond after that, until it runs out of power" is just wrong.

  8. #188
    Join Date: Apr 2015

    Location: Central Virginia

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    I'm Russell.

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    Quote Originally Posted by RothwellAudio View Post
    Sorry Russell, that's just wrong. Slew rate is the speed at which the output can move. However, you're right that it's measured in volts per microsecond, but the stuff like "...after the transient, the amp is unable to keep up, it loses 25 volts per microsecond. And another 25 volts every microsecond after that, until it runs out of power" is just wrong.
    Perhaps my wording is not great but the meaning is still true. With Slew Rate the lower the number the better, it is a measure of the rate of decay.

    Russell

  9. #189
    Join Date: Feb 2008

    Location: South Wales

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    I'm NotTakingLifeTooSeriouslyTheseDays.

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    I think on the whole, Russell gave quite a good insight into what is going on, although by his own admision, his wording may be a bit misleading to the tech savvy here,[ I am sure I, and others here have been guilty on that score at times too] Its a matter of getting the balance right when trying to get your point accross to those who may not be paticularly technicaly minded, but know what they hear, Sometimes people can get turned off a subject they may otherwise find interesting, if things get too technical.
    Quote Originally Posted by RothwellAudio View Post
    Sorry Russell, that's just wrong. Slew rate is the speed at which the output can move. However, you're right that it's measured in volts per microsecond, but the stuff like "...after the transient, the amp is unable to keep up, it loses 25 volts per microsecond. And another 25 volts every microsecond after that, until it runs out of power" is just wrong.
    "Today scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality"
    Nikola Tesla



    We Send our kids to school to be Educated, not Medicated!

  10. #190
    Join Date: Oct 2016

    Location: Bolton, England

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    I'm Andrew.

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    Quote Originally Posted by alphaGT View Post
    Perhaps my wording is not great but the meaning is still true. With Slew Rate the lower the number the better, it is a measure of the rate of decay.
    No, sorry Russell, that's not correct. Slew rate is a measure of rate of change - usually how fast the output can change voltage. 50V per microsecond is a higher slew rate than 25V per microsecond, and is better.
    https://en.wikipedia.org/wiki/Slew_rate

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