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Old 5th December 2011, 03:02 PM   #11
Zoran is offline Zoran  Serbia
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This is the circuit datas for Reactive load, like transformer with load of 2.4K.
For the solid range of bandwidth minimum inductance is about30 [Hy].
against maximum capacitance transferred at anode side of about 680 [pF],
which is not an unbearable question, but it is not so easy to achieve.
.
Cheers
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Old 5th December 2011, 03:08 PM   #12
Zoran is offline Zoran  Serbia
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PDFs from Transformer Loaded 6N6P in line preamplifier circuit mode...
The datas showing even less distortion compare to low distortion with classic R load...
But the results are obtained with simple equivalent circuit, without core issues
or transfer ratio. Just total approximated values.
Attached Files
File Type: pdf 6n6P_Current_Blue_Trans_Load.pdf (10.3 KB, 107 views)
File Type: pdf 6N6P_DB_Green_TransLoad.pdf (15.7 KB, 62 views)
File Type: pdf 6N6P_TransLoad _ MaxReactiveValues.pdf (14.2 KB, 77 views)
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Old 5th December 2011, 03:10 PM   #13
Zoran is offline Zoran  Serbia
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I can check some results from the same operating point, with choke load,
and maybe with constant current source.
cheers
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Old 5th December 2011, 03:12 PM   #14
Zoran is offline Zoran  Serbia
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From the previous datas I found another tube which could be loaded with the same
value like internal resistance. 6N30P russian tube
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Old 5th December 2011, 05:34 PM   #15
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I used the 6N6P Spice model you presented.
It gives mu=16.5 only. According the Soviet data sheet mu shoud be around 22.
My test circuit was CCS loaded common cathode amp.
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Old 5th December 2011, 05:47 PM   #16
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I checked the mu again from two different specifications and looked it from the anode curves. Those show some 17...18.5 indeed.
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Old 6th December 2011, 06:44 AM   #17
Zoran is offline Zoran  Serbia
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Artosalo, mu is amplification factor of the tube
and it is the figure that it is not constant over the whole region.
mu is changing value with respect to point of operation.
And in the datashets mu is given like sort of average value.
.
Another thing is that mu, like amplification factor, and -A, stage gain is not the same thing at all.
amplification of the stage or stage gain or whatever You can call it
is the figure that is always smaller than the mu of the tube.
Mu of the tube is from static datas on paper.
Against the stage gain that represents tube in real dynamic environment,
in real circuit.
So mu and -A (negative mark before A is from phase reversal...)
are not the same figures, and should not be the same, -A is always lower than mu
in CSS mode and Choke loaded tube, -A is little bit closer to mu then in other load fashions.
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Old 6th December 2011, 06:46 AM   #18
Zoran is offline Zoran  Serbia
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And You can find Yourself mu with the tubes datas of anode chrs.
from the graph. That method is the same for every classic style triode.
I post it at the first side.
.
mu is dUa/dUg in choosen point of operation.
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Old 6th December 2011, 07:15 AM   #19
Zoran is offline Zoran  Serbia
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it is not so clear at the picture of settings from the first side.
So I magnify the point of operation and internal parameters values at the graph. I hope that it could be of help.
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File Type: jpg 6N6P_internal_parameters_detail.jpg (90.7 KB, 461 views)
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Old 6th December 2011, 08:08 AM   #20
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Quote:
Artosalo, mu is amplification factor of the tube
and it is the figure that it is not constant over the whole region.
mu is changing value with respect to point of operation.
And in the datashets mu is given like sort of average value.
Thanks for free lesson .

My point however was that is the mu of actual 6N6P tube that low. I had an image that 6N6P and ECC99 (JJ) would be similar (mu = some 22), but after checking some of my old measuring results too ( with CCS as anode load) it seems that mu is well below 20.

Quote:
-A is always lower than mu
in CSS mode and Choke loaded tube, -A is little bit closer to mu then in other load fashions.
Would you please clarify what you mean.
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