The best preamplifier

[kevinkr]

I looked carelessly at the schematic and did not notice the added capacitor from the grid to anode.
But I could not find that there would be 4 tube halves ( 2 x 6N30P) in parallel.
Is it really so ?

Dual triode and the schematic seems to indicate two tubes, each pin has two pin numbers associated - presumably this means there are 4 sections in parallel. I'm not sure, language and drawing issues confuse the matter.

 

[Charm]

http://klausmobile.narod.ru/td/data/_6n6p.GIF
Tube Tester Files - 6N6P - 6H9?

 

[Charm]

Sorry Tube Tester Files - 6N30P - 6H30Ï
http://www.etd.su/djvu/209/1/6n30p-dr.djvu

 

[Alain Poitras]

Almost !

You've just forgoten the "magical" deliberatly added 10pF that makes this preamp "the best" 🙄

Here is "The Better Preamplifier Of The Whole Know And Unknow Universe" :

Yves.

Faux ... La réponse est perturbée par l'inductance, la capacité et la résistance du câble coaxial utilisé entre l'entrée et la sortie ... Sans parler de l'absence d'adaptation d'impédance et de gain qui sont les raisons d'être d'un préamplificateur !

Alain. 😀

P.S. I like very much your tubes curves tracer design using the powerline sinewave and the sound card inputs for the voltage and current simultaneous reading ... You are a "pro" ! 😉

 

[DF96]

But I could not find that there would be 4 tube halves ( 2 x 6N30P) in parallel.

Sorry, my mistake. I must have counted grid connections instead of grids!

Here is "The Better Preamplifier Of The Whole Know And Unknow Universe" :

Your preamplifier will sound harsh and clinical, even though it will measure almost perfectly.

 

[chanmix51]

Ah ah Alain,

You were quicker than me 😉

Cheers,
greg

 

[kevinkr]

Sorry, my mistake. I must have counted grid connections instead of grids!


Your preamplifier will sound harsh and clinical, even though it will measure almost perfectly.

It's not really clear to me whether it uses 1 x 6N30 or 2 x 6N30, the tube is a dual and the schematic implies to me based on the pin# shown that there are in fact 4 triode sections in parallel.

Yves, I love the last line in your copyright statement.. 😀

 

[quanghao]

Sorry, my mistake. I must have counted grid connections instead of grids!


Your preamplifier will sound harsh and clinical, even though it will measure almost perfectly.

I like your say: *Your preamplifier will sound harsh and clinical, even though it will measure almost perfectly*

thanks

 

[TonyTecson]

hi quangho, mind sharing your rationale for paralleled tube sections? have you tried the 6080 at such levels of voltage and currents?

 

[quanghao]

Ok!

that is circuit of my PRE

 

[dgta]

I think you need at least 6-8 sections in parallel to call it the "best preamp" 🙂

 

[quanghao]

I think you need at least 6-8 sections in parallel to call it the "best preamp" 🙂

No!
Please say* The best my PRE *, not for all
An not need many many Tube

 

[TonyTecson]

Ok!

that is circuit of my PRE

i understand your circuit, what i want to know is if you match your tubes for transconductance between sections and between tubes?

or do you just stick them in like i do?

 

[quanghao]

The best of my pre!

i understand your circuit, what i want to know is if you match your tubes for transconductance between sections and between tubes?

or do you just stick them in like i do?

IM NOT understand WHAT DO YOU SAY!

That is the best of my Pre!

 

[quanghao]

I use Hq supper shunt HQ regulate for My Pre
And use Salas CCS for it! I'm Thansk Salas very much!

 

[quanghao]

It is very good, only need one Cap 220uF in the fist filter!
the best use 33uF MKP x 6!
Thanks

 

[quanghao]

Hi! all if you like My pre 818!
please make it follow all the value!

The cap 10nF, if you not like it, you can remove it!

The supply you can use SSHV shunt! it is good!

Thanks

 

[quanghao]

This circuit for PRE818, and some pictures, I have done it
Thanks

 

[quanghao]

and some of my images measured Pre818

 

[Charm]

THD, Output impedance?🙂