6N2P-EV gain factor ??

[Kagliostro]

I've always read that 6N2P is a tube equivalent to the 12AX7 tube

with a gain a bit higher, around 110 instead of 100 of a 12AX7 tube

the 6N2P-EV is an improved version with 5000 Hours and mechanically stronger

recently I've read on Wikipedia 6N2P - Wikipedia, the free encyclopedia

that the 6N2P-EV has a slightly gain than 12AX7 and is comparable to the

5751WA tube, more form a vendor I get the info that the gain is 85-115 for the 6N2P-EV tube

6N2P-EV / 12AX7 / ECC83 tubes

This confuses me much, which is the gain of this tube ?

Thanks

K

 

[fdegrove]

Hi,

Supposedly you're referring to the mu-factor of these valves?

If you open the first page of the datasheet on Wikipedia then you'll see it stated as mu 100 for the 6N2P-EV.
Which is identical to that of a ECC83/12AX7A.

5751 has a mu of 70.

Ciao, 😉

 

[Kagliostro]

Thanks fdegrove

the datasheet was not well passed on scanner and I miss the 100 +/- 15% gain factor

so the real gain depends on the tube you have under hands

K

 

[matejsirk]

Tube Tester Files - 6N2P - 6H2P

gain = 77

 

[fdegrove]

Hi,

Keep in mind that those were NOS tubes from 1988 and:

Both tubes measured close although weaker than specification. Inside each, triodes differed, around 0.1-0.2 V grid voltage differential.

From my own experience testing thousands of those, spec do vary rather more than the +/- 15% stated.
So you better select and match them if you need close specs.

Ciao, 😉

 

[Kagliostro]

Thanks for the clarification

and .... no, I don't think I need matched spec

my use of the tube will be on guitar amp circuit, no HiFi

K