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|14th April 2015, 09:29 AM||#11|
Join Date: Feb 2010
I have used both types and they can be used in almost all similar purposes, but the design/component values differ a lot.
The main disadvantage of 6N1P (compared to 6N23P) I have noticed is that the saturating voltage ( Ua when Ug1 = 0 V) is quite high.
|15th April 2015, 01:00 PM||#12|
Join Date: Feb 2012
Location: North of Norway
6N1P is not the same as 6N23P/ECC88/6DJ8.
The Russian tube 6N1P is often, advertised as equivalent to ECC88/6DJ8/6922. In my opinion, this is not the case. There are rather large differences between these tubes. I will try to show you in this reply.
6N1P is pin compatible with ECC88, u is also about the same, but the rest of the specifications are not. Rp is higher and gm is only about 1/2 of ECC88.
6N1P also needs a heating current about twice the heater of ECC88. The max plate voltage of 6N1P is 300 v, and for ECC88 it is about 130, so that is something to consider if someone are to replace 6N1P with ECC88/6DJ8
I have done some work with the load lines and characteristics of the tubes to show you the difference, and to suggest what western tube that is the nearest equivalent of 6N1P.
The load line is drawn at the following points:
Ub 300 v, Ia max – 20 mA, Ug – 3v (Ub is the power supply voltage, Ia is the plate current and Ug is the grid voltage)
First, let us look at 6N1P see Fig. 1:
Fig.1. Here the chosen voltages gives the following result: Ia (plate current) 8.4 mA and a plate voltage (Ua) at 174.5 volt. The input signal voltage is 860 mV. This gives Ri of 6.6 Kohm, gm is about 5.5 mA/v and u about 36.
Now let us compare with ECC88/6DJ8, see Fig2 :
Fig. 2. This is not a good bias point for ECC88, but I am going to use it to compare the data with the other tubes.
As we see u is, as expected, about the same, the plate current is 10 mA, that is a bit higher, gm also has another value, 7.3 mA/v , Ua is at 148 v and Ri is at 4.6 Kohm, together a rather significant difference compared to 6N1P. And the working point is nowhere near optimum for ECC88 .
Now let us have a look at 6N23P see Fig 3:
Fig.3. This tube is not exactly the same as ECC88, but much closer than 6N1P.
Ia is 11 mA, Ua becomes 138 V, gm is a bit higher at 9.6 and u a bit lower 31 og Ri is also a bit lower, 3,2 Kohm.
6N23P is a much closer equivalent to ECC88, but how about 6N1P? Let us have a look at another western tube, the 6BK7/6BQ7 see Fig 4:
Fig. 4. The results are as follows:
Ia - 9 mA, Ua - 165 v, gm – 5, u 32.5 and at the end Ri 6.6 kohm. This is a lot closer to 6N1P than ECC88, the curves looks very similar too. The distortion is a bit higher. The curves looks very similar to 6N1P too.
This is IMO the closest western equivalent to 6N1P.
Look at the manufacturers’ datasheets.
And they give about the same results.
To summarize in a table, Fig 6:
My opinion is:
The closest western equivalent to 6N1P is 6BQ7/6BK7.
The closest Russian equivalent to ECC88 is 6N23P.
6N1P IS NOT EQUIVALENT TO 6N23P or ECC88/6DJ8.
This is based on the curves; I will be back with my own measurements later.
Last edited by toriversen; 15th April 2015 at 01:26 PM.
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