John Curl's Blowtorch preamplifier part II

[jneutron]

First off who was watching wrestling when you could have been watching the Thunderbirds and real roller derby?

No, not thunderbirds..1.2.3.4.

Better was Fireball XL5. Second was Supercar..

Marionettes?

Yup, both. And apparently sometimes TT's.

Ed, you simply don't understand the basics at times. I for one am tired of these discussions. Maybe jn wants to elaborate on the differences between the EM wave and charge.

To what purpose?? Arthur C Clarke had it right.

I thought that the signal and return current travel at the same time as a wave, are we saying here that it is like a train track, with the positive signal traveling down one wire then back up the other wire?
Puzzled...

Pipes...plumbing and bb's..forget the waves...

jn

 

[scott wurcer]

No, not thunderbirds..1.2.3.4.

Better was Fireball XL5. Second was Supercar..

jn

Yes, I loved Master Spy.

 

[Steve Eddy]

SE,
Those insane turntables with huge mass seem to be most concerned with speed control and using the high mass to keep speed constant.

Then how do you explain a 100 pound plinth and a 300 pound stand. 😀

Funny that they don't also have a clamping system to tie the vinyl to that moving mass sometimes. A bell jar with a vacuum attachment would solve all the other problems one may think up.

They'd just think up another problem.

se

 

[Kindhornman]

SE,
Some of the incredibly heavy plinths and vertical masses I have seen must be a damned load on any motor to get going from a stop. I understand the concept of a heavy mass keeping a constant velocity but it seems rather overkill many times. I didn't say that none of these turntables don't clamp the vinyl or even use a vacuum system to hold the vinyl down but some don't seem to do that I have seen in the past. I'll just have to do with my old direct drive and Dual turntables for now. I think I would build my own before paying someone the price for any of the commercial products costing such big bucks. Joachim seems to be a very good source for information on diy turntables and arms.

 

[jcx]

do vacuum systems have shaped a selection of mats to support the low mass thinned LP records that still had thick rims?

 

[prakit]

Any suggestions about caps, anybody? Please be serious, as I critique any suggestions. (you were warned, no more mister nice guy) '-)

Vishay Roderstein MKP 1837
http://www.vishay.com/docs/26017/mkp1837.pdf

 

[vacuphile]

A pulse propagating on a transmission line is not a packet of charge.

It would appear that due to cable capacitance, a charge corresponding to the level of that pulse would have to move through both legs of the cable at propagation speed, nb, no relation with A but with V.

 

[PMA]

EM field, not charge.

 

[marce]

Please stop this nonsense, the circuit is completed at the source, the charge at the output is immediately equaled at the ground return. There is no packet of charge accellerated to c shot out the end of the generator.

😀
That what I don't understand with the claim, isn't the negative pulse the reflection from the end of the cable...

 

[jan.didden]

It would appear that due to cable capacitance, a charge corresponding to the level of that pulse would have to move through both legs of the cable at propagation speed, nb, no relation with A but with V.

Maybe a stupid thought, but if the charge doesn't propagate through the cable at finite speed, how come delay lines work?

Jan

 

[PMA]

Signal propagates as a field.

 

[marce]

propagation delay?

 

[jan.didden]

Signal propagates as a field.

So Pavel, delay lines work because the field representing the signal propagated at finite speed?
Is the field inside or outside the cable?

Jan

 

[simon7000]

Signal propagates as a field.

Even DC?

 

[TNT]

Sorry that things don't hang together nicely, Pavel, but that's the nature of what happens when one, or at least me, attempts to to get the best performance out of an audio system. I note. ...

But wasn't it you who listened mostly to computer speakers?

//

 

[SY]

So Pavel, delay lines work because the field representing the signal propagated at finite speed?

Many delay lines work by transmitting the signal acoustically, which is more manageable for longer delays.

 

[scott wurcer]

Many delay lines work by transmitting the signal acoustically, which is more manageable for longer delays.

Every old SECAM TV had a one scan line piezo-acoustic delay line.

 

[scott wurcer]

Even DC?

Still stuck on EM wave propagation vs DC current?

 

[Joachim Gerhard]

Audio Consequent

 

[Rick Miller]

> (The wise may look at using a 240 volt primary
> on a 120 volt line with four output windings!)

By " 4 windings " do you mean 2 / channel ?
Right about the 240 V primary
( remembering to maintain the current capability of the secondary )

What does the 240v primary do for you? Is more L from more windings on the primary better to choke out the line noise? Do you phase the secondary windings to cancel unwanted noise, is that why four?