Amps - Whats in em and why?

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Daniel Quinn
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Re: Amps - Whats in em and why?

Unread post by Daniel Quinn » Wed Nov 06, 2019 5:08 pm

We're the fun in that?

Lurcher300b
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Re: Amps - Whats in em and why?

Unread post by Lurcher300b » Wed Nov 06, 2019 5:11 pm

We're the fun in that?
Are you.

valvesRus
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Re: Amps - Whats in em and why?

Unread post by valvesRus » Wed Nov 06, 2019 5:42 pm

Daniel Quinn wrote:
Wed Nov 06, 2019 5:08 pm
We're the fun in that?
Don't include me in the we're bit. :lol:

Lurcher300b
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Re: Amps - Whats in em and why?

Unread post by Lurcher300b » Wed Nov 06, 2019 5:51 pm

Who mentioned we're bits

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Hemmo1969
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Re: Amps - Whats in em and why?

Unread post by Hemmo1969 » Wed Nov 06, 2019 7:36 pm

So 690 views and 40 odd posts and I'm still no more educated than when I started (Bar the one sensible post)

Mods can you please delete this thread please. Fun me.....Hifi Wigwam would have been a better bet.

Geoff.R.G
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Re: Amps - Whats in em and why?

Unread post by Geoff.R.G » Wed Nov 06, 2019 7:52 pm

Hemmo1969 wrote:
Tue Nov 05, 2019 4:54 pm
Afternoon all,

I'm pretty lost when it comes to all the technical jingo that many of you guys can talk, especially on the DIY threads. Although I do like to read em I wouldn't mind understanding a bit more. So this had me thinking when I read some of the latest bumf on a new amplifier to be released what the hell it all means and does my amp have such components? I'm currently sporting a pair of A80s MkII mono blocks in my system of which I adore.
Great, stick with them.
So if you read the excerpt below, what then is or the benefit of;
    • Polypropylene capacitors
      • K-Power reserve capacitors
        • An output stage using 4 x 160w Sanken output transistors. Are Sanken even a good brand.
        Marketing hype mainly though polypropylene capacitors are generally considered superior to other film type capacitors for audio.
        I had to Google Sanken and I am none the wiser except that they say the specialise in power semiconductors. Unfortunately the specific comment is hype too, four output transistors per channel may, or may not, be a good idea depending on the circuit configuration. The Doc's mantra of "no component is better than a component" is relevant here, if two transistors can do the job, four is degrading the sound (Class AB or Class B needs a minimum of two).
          • And secondly looking inside said Amplifier there just one big toroidial transformer? Is this really the best way 1 x big I thought NVA Amps had multiples of on either input or output?
          Yours with appreciation...... Mr confused. :grin:

          Chris (Hemmo)
          ImageImage
          Many a good well regarded amp has a single toroidal transformer powering two channels. Having sufficient current from the transformer is what matters, some designers like to get that using two others are comfortable with one. Obviously monoblocks will have one each.

          The comment about the pre-amp using class a configuration is meaningless, almost all pre-amps use a class A output, the output isn't a high current and the power amp input is not current driven so they are just using words to fill the space.

          Lurcher300b
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          Re: Amps - Whats in em and why?

          Unread post by Lurcher300b » Wed Nov 06, 2019 9:06 pm

          So 690 views and 40 odd posts and I'm still no more educated than when I started (Bar the one sensible post)
          All you will get from your question is other peoples opinions, if you want facts, then you will need to spend five years learning electronics to understand the answers, by which time you will not need the question answering anyway.

          Daniel Quinn
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          Re: Amps - Whats in em and why?

          Unread post by Daniel Quinn » Thu Nov 07, 2019 8:49 am

          Lurch is telling the truth.

          All your question illicit is people's opinion. The advertisement is full of shite but beyond that either you forgot about it or you learn. There is no in between.

          I was happy being a lawyer and trusting the doc. His death and my brain bleed changed all that.

          Geoff.R.G
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          Re: Amps - Whats in em and why?

          Unread post by Geoff.R.G » Fri Nov 08, 2019 12:29 pm

          Lurcher300b wrote:
          Wed Nov 06, 2019 9:06 pm
          So 690 views and 40 odd posts and I'm still no more educated than when I started (Bar the one sensible post)
          All you will get from your question is other peoples opinions, if you want facts, then you will need to spend five years learning electronics to understand the answers, by which time you will not need the question answering anyway.
          Absolutely, my comments are mere supposition, I didn't design the amplifier in question and I have no idea why the designer did things in the way they have been done. Nor do I know why the marketing department put so many meaningless technical words in the advert.

          To be fair, I would like to know why they chose four output transistors per channel?

          Lurcher300b
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          Re: Amps - Whats in em and why?

          Unread post by Lurcher300b » Fri Nov 08, 2019 12:48 pm

          To be fair, I would like to know why they chose four output transistors per channel?
          They will have looked at the expected power output required into various loads, then looked at the SOA curves for the output devices, then decide what safety margin they need and base the number of devices on those things.

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