John Curl's Blowtorch preamplifier part III

[scott wurcer]

The issue started with Scott Wurcer denying that there were problems with dirty contacts not passing signal until a voltage threshold was reached and then they would work.

Just saying never observed it, never had a young guy get confused by lab measurements and ask what's up with this, never worked on a physics project for space or terrestrial work where it was common practice to undo and clean contacts on any kind of schedule, never heard any anecdotes from guys like the ones at LIGO about interconnect problems messing up a science run.

It does happen rarely i.e. the super-luminal neutrinos (cost people jobs).

And once again, any sudden discontinuity in conductivity is rectifying, your own reference cites it.

So please there must be more important things to discuss. BTW we use Teledyne miniature RF relays in the most critical spots, very expensive.

 

[Bonsai]

I think an AG would handle those levels reliably as well - as would most other SS relays.


If AP use this stuff, I'm good to go!

 

[syn08]

the reed needs to be magnetic and that introduces hysteresis in the signal based magnetic field.

Right, I see you are still building your own private physics.

 

[billshurv]

I think an AG would handle those levels reliably as well - as would most other SS relays.

You missed the free part...Why pay for something when I have a better part for the job for nothing...

 

[PMA]

I had problems with 30A power relays, Finder 65.61.9.024.0300 (measurable distortion after some time), and replaced thim with SSR forever. The problem was in a contact material, AgCdO. It does not mean that EVERY relay is bad.

 

[DF96]

And somebody (me) should tell "DF" that complex numbers are not needed to explain something that can already be explained by Ohm's Law.

I will take that as an admission that you don't understand complex numbers and therefore cannot understand impedance. In turn this means that all your ramblings are based on elementary fallacies. However, I applaud your persistence. I expect somewhere Solomon said something about people who regard their own ignorance of accepted facts as being a more advanced form of wisdom.

Now please explain:
F = BLi
So what is F in this instance?

F is force, not speaker output.

 

[PMA]

He maybe thinks and knows force/voltage, velocity/current elmech transformation.

Joe, inductive impedance is Z = R + jwL. That j is a complex constant, (0,1). Complex number is two dimensional, it has real and imaginary part ( that with j). You cannot simply add real and imaginary part into one mess.

RLC CIRCUIT

Complex number - Wikipedia

 

[simon7000]

Just saying never observed it, never had a young guy get confused by lab measurements and ask what's up with this, never worked on a physics project for space or terrestrial work where it was common practice to undo and clean contacts on any kind of schedule, never heard any anecdotes from guys like the ones at LIGO about interconnect problems messing up a science run.

It does happen rarely i.e. the super-luminal neutrinos (cost people jobs).

And once again, any sudden discontinuity in conductivity is rectifying, your own reference cites it.

So please there must be more important things to discuss. BTW we use Teledyne miniature RF relays in the most critical spots, very expensive.

Why don't you try cleaning the contacts in your sound system, see if it makes a difference.

It is not a sudden discontinuity, it is a sudden continuity.

 

[PMA]

It is not easy to make it for sealed relays

 

[tapestryofsound]

You can't prove anything. It's up to the "creators" to provide evidence that they might be right.

Yes, I guess you are right. After reading reams and reams of stuff, and no longer knowing who is right, or what is right, or even what is even being talked about, my instinct tells me not to no longer believe anything. Self preservation of my precious sanity, I suppose.

 

[PMA]

Another advice - learn and study, seriously, not in the forums. Never too late.

 

[AllenB]

I expect somewhere Solomon said something about people who regard their own ignorance of accepted facts as being a more advanced form of wisdom.

Solomon was most interested in understanding and discernment.

 

[scottjoplin]

It depends what you want to learn, if it's how a certain element "sells" it's wares it can be quite insightful I could tell you more about what I alluded to earlier but I was told I was lucky I hadn't been sin-binned

 

[PMA]

"Politically incorrect"?

Ain't that all funny.

 

[scott wurcer]

It is not a sudden discontinuity, it is a sudden continuity.

The way up and the way down are one in the same.

 

[Markw4]

After reading reams and reams of stuff, and no longer knowing who is right, or what is right, or even what is even being talked about, my instinct tells me not to no longer believe anything.

Now you are starting to wise up. You were rude previously to people you were convinced were totally wrong. You tried to get them to shut up and go away. There are people talking past each other here, some people are much more educated than others, some with much more skilled hearing than others, and some who make mistakes and get fooled at times when listening despite being mostly skilled. Then there are some who are sometimes excessively intolerant of those who are unlike themselves. Welcome to your new perspective here on the thread, you will probably figure it out for yourself after expending some time and effort, and after doing some introspective thinking too.

All the foregoing IMHO only, of course.

 

[PMA]

The way up and the way down are one in the same.

Well, talking about contact switching phenomena, arc creation and blast, not really.

 

[Evenharmonics]

When we went from tube PAmps to SS, we noticed, by listening, that the bass was deeper, tighter, more accurate. Same effect occured when we used very thin speaker wires compared to thick (large AWG). Larger affected the bass ... deeper,louder etal.

So what do EE do? They measure the damn wire by itself and proclaim nothing there... small Rs. Cannot have any affect on the sound. If I stick a series Resistor in the speaker line(s) and the bass or other freq response areas sound affected..... what do the EE do? They take the resistor and measure it and claim it cannot do anything like what we heard.

Then some bright guy thinks maybe it is an intereraction with amp and speaker and Rs.... like maybe Damping Factor and output Z.

Time and time again and again this is played out every time someone does something and people hear a change. Never look at the whole... only the part.

Instead of being so narrow in view, how about figuring out why/how something simple could make a difference.

THx-RNMarsh

Really.

-Richard

Oh please. Such drama. KMA.
--------------------------
Go ahead Joe R..... tell more.

THx-RNMarsh

What helps your claim is quoting those who did what you say they did.

 

[scott wurcer]

Well, talking about contact switching phenomena, arc creation and blast, not really.

Not the pictures I was referring to, it was simple I/V characteristics presented 0 conductivity at the origin and sudden break point at some voltage. This characteristic will rectify if it is stationary.

 

[PMA]

OK. I meant rather arc interruption than arc blast. You know the phenomenon when arc is created and when interrupted is different and it applies to amp power relays.