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Old 30th November 2012, 03:22 AM   #1991
Rush is offline Rush  United States
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Quote:
Originally Posted by qusp View Post

the impedance of the transformer is hardly going to be the dominant impedance in a preamp is it?
Yes, the impedance of the transformer is reflected.
I didn't come to this conclusion through any kind of math, I tried transformers with fatter wires in them (more current capable or another way of thinking, low impedance) and yes you can hear a difference.
Try it, buy a transformer of the same voltage as you would normally use, only 5 to 10 times the amp rating for your preamp.
You will be hooked on the silly size.
Whatever problems this creates you will work through and be glad you did.
And the caps don't hardly discharge on a preamp while your using it, so your over thinking this.

Rush
PS, Of course this is my opinion and if I am wrong, prove it by testing it, not by math or thinking about it.
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Old 30th November 2012, 04:07 AM   #1992
qusp is offline qusp  Australia
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No, it really isnt, the dominant impedance is that of the local regulation and decoupling, of the consumer, if you are relying on having a low impedance transformer (in another case on the end of a cable) to deal with short term local current demand in a low current, low noise circuit, youve got it backwards.

I really dont need to prove anything to you, you are the one making the claims

you are suggesting I need to replicate your preamp and power supply to prove you wrong?... lol

thats even if you assume thats my motivation...

Last edited by qusp; 30th November 2012 at 04:24 AM.
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Old 30th November 2012, 04:16 AM   #1993
Rush is offline Rush  United States
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Originally Posted by qusp View Post
No, it really isnt, the dominant impedance is that of the local regulation and decoupling, of the consumer, if you are relying on having a low impedance transformer to deal with short term current demand in a low current, low noise circuit, youve got it backwards.

I really dont need to prove anything to you, you are the one making the claims
Now you are thinking instead of finding out for sure.

I have done the test, I am sure.

Rush
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Old 30th November 2012, 04:18 AM   #1994
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Originally Posted by Rush View Post
Now you are thinking instead of finding out for sure.

I have done the test, I am sure.

Rush
If YOU look at where the current really flows, then you will know for sure.

Now you are just imagining where the current flows.

What is the purpose of the capacitor in your circuits?
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Old 30th November 2012, 04:33 AM   #1995
Rush is offline Rush  United States
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Originally Posted by hochopeper View Post
If YOU look at where the current really flows, then you will know for sure.

Now you are just imagining where the current flows.

What is the purpose of the capacitor in your circuits?
I have no idea what your are referring to.

So you have tested a larger transformer vs a smaller one? And found what?

Are you thinking or doing?

Rush
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Old 30th November 2012, 04:39 AM   #1996
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Originally Posted by Rush View Post
I have no idea what your are referring to.

So you have tested a larger transformer vs a smaller one? And found what?

Are you thinking or doing?

Rush
I think before I build. I also think before I write. People these days will find any excuse to avoid thinking, it seems.
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Old 30th November 2012, 04:39 AM   #1997
qusp is offline qusp  Australia
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I updated my post which you may not have seen. your transformer is even in another case! assuming any transformer we are talking about has more than enough capability to power the circuit, you expect having a lower impedance larger transformer makes any difference at the end of a cable, perhaps a connector or 2, your rectifiers and smoothing/ CRC/ CLC/ or inductors? really?

no; local regulation and decoupling is supplying transient current demand, not the transformer

Last edited by qusp; 30th November 2012 at 04:46 AM. Reason: punctuation
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Old 30th November 2012, 04:43 AM   #1998
Rush is offline Rush  United States
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Originally Posted by hochopeper View Post
I think before I build. I also think before I write. People these days will find any excuse to avoid thinking, it seems.
You win, I am done.
Don't try it, you wouldn't like it anyway.

Rush
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Old 30th November 2012, 04:57 AM   #1999
Rush is offline Rush  United States
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Originally Posted by qusp View Post
I updated my post which you may not have seen. your transformer is even in another case! assuming anything we are talking about has more than enough capability to power the circuit. you expect having a lower impedance larger transformer makes any difference at the end of a cable, perhaps a connector or 2, your rectifiers and smoothing/ CRC/ CLC/ or inductors? really?

no; local regulation and decoupling is supplying transient current demand, not the transformer
Hey, thats not fair changing the post after I replied. :-)

This is just what I have found.
Please tell me, should I have not brought it up?
I surely don't want to make someone angry, it is just so easy to dismiss the idea without trying it.
So why do you bother dismissing the concept, if at least I think it sounds better?
I first found this out with a Threshold FET 10 preamp. Built power supplies for my local audio store that he then sold to his best customers with this preamp. We all had fun and it made the preamp better. Go figure!

I am not going to defend this anymore. You guys are smarter than I am, you can think all the good stuff right into your projects and you surely don't need some 60 + year old reminiscing about simple things that made a difference a long time ago.

Rush
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Old 30th November 2012, 04:59 AM   #2000
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You win, I am done.
Don't try it, you wouldn't like it anyway.

Rush
It isn't about winning; its about do/design it yourself audio. A few people have pointed out where you should be looking/thinking about your design choices differently.

For a power amplifier with a linear supply, there is a point to a larger transformer, though in that case it is often more important to get the power supply capacitance correct and electrically close enough to the load.

For a line stage circuit with a shunt regulator, there is very little point to an oversized transformer. It is not the part of the circuit that supplies the current to a transient load.
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