6N2P vs. ECC83/12AX7

(General) Forum about other items than listed below

6N2P vs. ECC83/12AX7

Postby Allan » Sun Mar 02, 2014 5:57 am

Hello Jac. Hello everyone.

The 6N2P (6Н2П) is supposed to be very similar to the ECC83 /12AX7 but it has a slightly different pinning. Below is information gathered from what I have read. Please correct me if I am wrong about this.

The 6N2P is normally tested at:
Ua = 250V, Ug1 = -1.5V where 100% is: Ia=2.3mA / S=2.0mA/V

If the 6N2P is tested at ECC83 settings:
Ua = 250V, Ug1 = -2.0V where 100% is: Ia=1.8mA / S=1.8mA/V

An ECC83 tested at its normal settings:
Ua = 250V, Ug1 = -2.0V where 100% is: Ia=1.2mA / S=1.6mA/V

Now the confusing part. I went to look at the curves listed in the 6N2P-EV datasheet available online. What I found was the curves looked the same as an ECC83. At 250V and –2V bias, the 6N2P-EV draws 1.2mA, exactly the same as the ECC83.

I have read people mentioning that the 6N2P has less gain than the ECC83. Is this really true? Maybe I missed something in the datasheet, but I would think the 6N2P would have the same gain or slightly higher. It would appear to draw more current and have a slightly faster slew rate due to its higher transconductance.

By the way, the above information I have based on datasheets. So this deals with bogey tubes or the perfect specimens. I understand both types have very different test results in the real world. I am just wondering if the 6N2P is a direct replacement for the ECC83 in terms of performance. Thank you.

-Allan
:?
User avatar
Allan
 
Posts: 17
Joined: Wed Apr 04, 2012 3:54 am
Location: Boston

Re: 6N2P vs. ECC83/12AX7

Postby J. Leven » Sun Mar 02, 2014 10:21 am

Hi Allan,
Here are infos for the tube, you onlly need to translate
http://www.tube-town.de/ttforum/index.php?topic=10267.0

Greetings J. L.
J. Leven
 
Posts: 170
Joined: Fri Jan 13, 2012 12:27 pm

Re: 6N2P vs. ECC83/12AX7

Postby Allan » Fri Mar 07, 2014 5:06 am

Hi J.L.

Thank you for the link to that thread. After I translated it, I read through it all. Haven’t spoken German since I was a child.

A very important thing I learned was that the heater to cathode potential is limited to 100V rather than the 12AX7/ECC83’s 200V. Very good to know especially if using cathode followers or cathodyne phase inverters. Often this potential can be higher than 100V in these circuits.

The thread didn’t mention anything about the 6N2P’s performance curves versus the ECC83’s. I went back and compared the anode curves just to make sure. I used the 6N2P-EV and 1954 Telefunken ECC83 datasheets. Yes they are the same for both tube types, at least for –1.5V & -2V biases at 250V plate. But the 6N2P’s transconductance is lower when biased at –2V, only 1375 (1.375mA/V) versus the ECC83’s 1600 (1.6mA/V). When biased at –1.5V, the 6N2P is the same as the ECC83: 2100 (2.1mA/V). So there are some differences but overall they look almost the same.

-Allan
User avatar
Allan
 
Posts: 17
Joined: Wed Apr 04, 2012 3:54 am
Location: Boston


Return to HiFi Equipment Forum

Who is online

Users browsing this forum: No registered users and 1 guest

cron