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-   -   6N6P tube - focus on (http://www.diyaudio.com/forums/tubes-valves/201362-6n6p-tube-focus.html)

Zoran 28th November 2011 09:15 AM

6N6P tube - focus on
 
2 Attachment(s)
Here is some sheets about 6N6P russian double triode noval base tube.
I was working on spice model for my bunch of tube models, have spoted
some notes about the tube that could be of interest for the future experiments with 6N6P tube.
Txt file contains datas fro manode chrs. graph. (GraphClick.app used for extracting values from the graph)

Zoran 28th November 2011 09:25 AM

1 Attachment(s)
there is global PSpice model for all region showed in the datas. I compare two sources of datas and they are pretty same with minor differences.
.m file is Matlab file for module with Tuparam. m file from Norman Koren site.
You can download the file from his site and find additional useful informations
about modeling in spice for tubes. GraphClick file for 6N6P tube graph is a bigger file and I can send via mail, just ask (mac osx app.)

Zoran 28th November 2011 09:45 AM

1 Attachment(s)
Spice model with orcad against the datas

Zoran 28th November 2011 09:48 AM

1 Attachment(s)
The suggestion for the setting the working point for smaler signals input
like for instance line preamplifier stage or 1st stage in power amplifier...
:trapper:
I found some interesting region at the chrs graph. In that region tube is
particularly linear. Also 6N6P can accept the signal of about 4Vp-p at the input.
With aminimum distortion.
What is from the character and bit of unusual,
is that the load line can be set with a value equal of Ri (internal resistance of the tube in working point)
or even a little bit less from Ri value.
And with the same portions of current amplifying values as well as voltage values.
And the load line angle is 45deg from 90deg line to the Anode Ia/Ua -8V Ug line.
Which is could not be accomplished with every point in the region
.

Zoran 28th November 2011 09:52 AM

You can find from the picture static point datas and tube chrs in point of use
with load lines. Ri is about 2.4K and load could be even 2.2K less than Ri.
With Ri of 2.4K the load line is with 45deg against the Ia curve.
Cdynamic is the value calculated with gain in point, and about 0.7pF added for the socket
...

Zoran 28th November 2011 10:33 AM

1 Attachment(s)
Circuit with values close to the one from the graph...:)
I wil try to extract graph of the output impedance, bandwith, FFT and so.

Alain Poitras 28th November 2011 11:10 AM

Quote:

Originally Posted by Zoran (Post 2797749)
Here is some sheets about 6N6P russian double triode noval base tube.
I was working on spice model for my bunch of tube models, have spoted
some notes about the tube that could be of interest for the future experiments with 6N6P tube.
Txt file contains datas fro manode chrs. graph. (GraphClick.app used for extracting values from the graph)

What do you think about the 6S7B triode ...

This is a strange "subminiature tube" but I believe it is a fantastic one and it cost about nothing on eBay ...

The curves are very linear all over a 350V peak to peak output swing with just - 3,25V bias at 300V 3ma (0,9W) operating point (the maximum Ua) ... So the gain is very high ! It have a 1,45W maximum dissipation and 7ma current. I evaluate the dynamic plate resistance to about 25K at this point, like a 12AY7.

I think I will buy some this winter for tests, they cost about 40$ for a lot of 10 and less than 15$ for two ... It is easy to hookup them on a small "terminal strip" inside the amplifier frame.

Alain. :D

Zoran 28th November 2011 11:48 AM

Alain
I did not have any experiance with this type, but over the very quick look at the pdf,
it seems that is more than OK?
Yes it is linear, but not over the wider region, just about the 1Vp-p input voltage
and it will be in the higher Va pole of about 250V from max. 300V Va.
and the Ia of about 4.5mA (strange thing, factory recommended values are not always friendly with "audio best" values for the same type...)
.
the tube showing a not so small tollerances of mu and other units, so You can expect
some drift from original datas. Probably it is the best way to measure curves for real specimen?
.
And tube is very tolerant to shock and vibrations, extremly, which could lead to the notion that the internal construction and materials are very good. but like other miniature tubes has les value of working hours 1500 from the pdf...
cheers

Zoran 3rd December 2011 10:55 AM

4 Attachment(s)
there are some graphs of
Bandwith
output resistance
Voltage FFT
And Current FFT
.
Tube showing very low level of THD even with full pot
and lower output resistance (1160 ohms) for small tube stage
:trapper:
cheers

Zoran 3rd December 2011 10:58 AM

I will put the same circuit with Inductive load
for transformer or choke load operation
and post results...


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