Addressing John Curl's concerns on low noise designs

[Wavebourn]

Wavebourn, you are mixing up the two designs. Please, try to not find fault with such relish, or I will respond in kind.

What do you mean?
My point was, I respectfully believe you that pentode LTP pair produced very low THD because I myself have such an experience, supported by link of my schematic I revealed for free (no fee, John)

 

[john curl]

I see the problem: The 2 designs, FET and TUBE were DIFFERENT units, not the same unit. The FET unit was set by me at 200V. The TUBE unit had even higher voltages, but I don't remember what they are. I could probably find out, if this is important.
The way I described the tests was ambiguous, and I will try to be more careful, especially for people from other countries.
Actually, Wavebourn, I have no idea what you were trying to say at this point, but I did just what I was criticizing others for, jumping to a negative conclusion. Sorry about that. (in this case)😕

 

[john curl]

Your self-reflection is apparent, Syn08.

 

[scott wurcer]

The way I described the tests was ambiguous, and I will try to be more careful, especially for people from other countries.
Actually, Wavebourn, I have no idea what you were trying to say at this point, but I did just what I was criticizing others for, jumping to a negative conclusion. Sorry about that. (in this case)😕

My mistake, I was thinking of a complete tube amp driving a load with 10ppm distortion at full output. You offset one side just to force some seconds, pretty good match I'd say. Still my ST had -106dB thirds so I wouldn't trust it as the last word at 10ppm.

 

[john curl]

Good point, Demian, I was thinking of CERN, myself, but I believe Stanford was first.

 

[john curl]

Scott, it was brand new, it was 1974-75. It was very close to .001%, if not exactly.

 

[Wavebourn]

This?
Complimentary Tube The timing is about right. Too big for my living room.

Speaking of timing... http://encarta.msn.com/encyclopedia_762505345/marie_curie.html

 

[syn08]

I?ll order some for you tomorrow, drop me an email about how many you need.

YGM

 

[jan.didden]

This driver delivers 60V P-P on each of 2 outputs to grids of output tubes nominally, maximal voltage swing is more than 100V (200V differential).

http://wavebourn.com/forum/download.php?id=119&f=7

Anatolyi you need a couple of my tube regulator boards 😉

Jan Didden

 

[jan.didden]

😕

People sometimes here seems to forget that this is an international forum and people from various nations-language areas come to discussion. Not all of them are native English speakers and sometimes those people have difficulties-troubles to truly express themselves and present to others their thoughts. I am one of those people and I am very confident that you guys have concluded what I wanted to say...


P.S. I am not an native English speaker, so sorry for any mistakes....

Cheers

Syn08 was commenting on:

"transistors don`t have the properties (capabilities) of tubes."

I don't know why you rant about 'non-native speakers' and 'international community' but this seems a very clear and unmistaken statement. It also factually correct but at the same time devoid of any real content; a real achievement! It indeed is actually abyssmal. So? 😉 Lighten up!

Jan Didden

 

[stinius]

Anatolyi you need a couple of my tube regulator boards 😉

Jan Didden

Jan
The regulators you published in Elektor looks really nice, congratulations.

BTW shouldn’t there be a follow up article on the Pax-amp? Or have I missed something.

 

[jan.didden]

As this thread's only tube gear manufacturer (or so I assume), I do not automatically consider tube circuits to be superior to SS.
[snip]Regards, Allen

www.vacuumstate.com

Allen, you're out of place here! 😀

Jan Didden

 

[Wavebourn]

Anatolyi you need a couple of my tube regulator boards 😉

Thank you Johannes; you know when my birthday is. 😉

PS: I remember my promise, about an article. I did not have a time to start yet, sorry...

 

[jan.didden]

Thank you Johannes; you know when my birthday is. 😉

Next week? 😀

Jan Didden

 

[Wavebourn]

Next week? 😀

Yes, please! 🙂
If you wish it to be earlier than October, 30
😀

 

[Wavebourn]

Jan, my regulator board look not so nice like yours:

http://wavebourn.com/forum/viewtopic.php?p=22572#p22572

 

[Sigurd Ruschkow]

That is where I bought mine a year ago or so. Dalbani is a good company and I have not had any fakes from them. Not the cheapest around nor do they stock much, so I had to wait a few weeks until they shipped the ones I ordered.




Sigurd

www.dalbani.co.uk still has 2SC2547E and 2SA1085E (the highest beta grade) for reasonable prices.

http://www.dalbani.co.uk/catalogue/product_details.php?id=2996
http://www.dalbani.co.uk/catalogue/product_details.php?id=1200

A mercyful european soul can get some and send them to me in private, otherwise banks, Canadian customs and taxes will double the price. Hope they are genuine...

 

[Sigurd Ruschkow]

I must disagree with you, Scott. I disagree due to the fact that I have done blind and none blind tests for ages: differences are there. Even for resistors.

No offence taken.



Sigurd

Differences by listening alone do not exist. Sorry if that offends anyone and you can just ignore it, but I will stand by that claim that a precision resistor can not have an audible artifact in its transfer function. Held under strict scrutiny all results to the contrary will not hold up.

 

[Sigurd Ruschkow]

I am an engineer, too.

Been working as one for about 20 years now. Both as hardware, software, and system engineer and the last years as project manager.



Sigurd

Shush, don't annoy the engineers!

 

[SY]

I have nothing to hide. Until proven wrong, I stand by my results.

Where would you have published these results? The only way they can be evaluated and validated or falsified is with examination of details on test protocols and the test data.