Can I use a 12AX7 with CT 6.3V?

Troncones · 27th February 2011, 05:44 PM

How do you wire it?

boywonder · 27th February 2011, 05:47 PM

Yes, one end to pins 4&5 (tied together) and the other end to pin 9.

TDSL Tube data [12AX7]

Troncones · 27th February 2011, 06:05 PM

Thanks Scott,

Would it be the same for a 6N2P?

rotaspec · 27th February 2011, 06:42 PM

Quote:

Originally Posted by Troncones

Thanks Scott,

Would it be the same for a 6N2P?

No. The 6N2P is wired to have 6.3v on pins 4/5.
Irritating because it would be nice to be able to swap the two types for listening comparison.

Gary

v4lve lover · 28th February 2011, 12:36 PM

if one of your heater winding is grounded .
you could end up whit
12ax7
pin 4 +6.3v you shouldnt tie these together .
pin 5 +6.3v
pin 9 ground

use a switch witch is a 2 position 1 pole . ( dual if your using two 6n2p )
to switch pin4 on the 6n2p
6n2p
pin 4 ground
pin 5 + 6.3v
pin 9 ground . this does NOT matter as its only a shield and its not connected to any further elements in the tube .
in this way you could use both

Troncones · 28th February 2011, 06:01 PM

Thanks v4lve,

I will try this when I get my other Tx. The one I'm using for the test build only has 3.15-0-3.15.

v4lve lover · 28th February 2011, 06:11 PM

it does not matter if its center-tapped . if im correct . if someone thinks im wrong please correct this .

DF96 · 28th February 2011, 06:49 PM

12AX7 requires 6.3V (or 12.6V). 3.15-0-3.15 is 6.3V CT. You need 6.3V, you have 6.3V - so no problem.

Troncones · 1st March 2011, 03:05 AM

With the 6N2P how can you put 6.3 on pin 5 using CT 6.3V?

DF96 · 1st March 2011, 10:10 AM

I don't understand the question. Heaters are almost always about the voltage beween two pins, not the voltage on one pin. (minor exceptions are those valves which tie one side of the heater to the cathode, like some beam deflection mixers). You need 6.3V, you have 6.3V. What is the problem?

27th February 2011, 05:44 PM	#1
Troncones diyAudio Member Join Date: Dec 2009 Location: Orange County, California.	Can I use a 12AX7 with CT 6.3V? How do you wire it? __________________ The Myth: A hand full of Tubes, Caps, Resistors and Iron and you have an Amp. The Reality: You have self induced Dementia. Newbie.

27th February 2011, 06:05 PM	#3
Troncones diyAudio Member Join Date: Dec 2009 Location: Orange County, California.	Thanks Scott, Would it be the same for a 6N2P? __________________ The Myth: A hand full of Tubes, Caps, Resistors and Iron and you have an Amp. The Reality: You have self induced Dementia. Newbie.

28th February 2011, 06:01 PM	#6
Troncones diyAudio Member Join Date: Dec 2009 Location: Orange County, California.	Thanks v4lve, I will try this when I get my other Tx. The one I'm using for the test build only has 3.15-0-3.15. __________________ The Myth: A hand full of Tubes, Caps, Resistors and Iron and you have an Amp. The Reality: You have self induced Dementia. Newbie.

1st March 2011, 03:05 AM	#9
Troncones diyAudio Member Join Date: Dec 2009 Location: Orange County, California.	With the 6N2P how can you put 6.3 on pin 5 using CT 6.3V? __________________ The Myth: A hand full of Tubes, Caps, Resistors and Iron and you have an Amp. The Reality: You have self induced Dementia. Newbie.

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27th February 2011, 05:47 PM	#2
boywonder diyAudio Member Join Date: Jan 2008 Location: So.Cal.	Yes, one end to pins 4&5 (tied together) and the other end to pin 9. TDSL Tube data [12AX7]

28th February 2011, 12:36 PM	#5
v4lve lover diyAudio Member Join Date: Aug 2010	if one of your heater winding is grounded . you could end up whit 12ax7 pin 4 +6.3v you shouldnt tie these together . pin 5 +6.3v pin 9 ground use a switch witch is a 2 position 1 pole . ( dual if your using two 6n2p ) to switch pin4 on the 6n2p 6n2p pin 4 ground pin 5 + 6.3v pin 9 ground . this does NOT matter as its only a shield and its not connected to any further elements in the tube . in this way you could use both

28th February 2011, 06:11 PM	#7
v4lve lover diyAudio Member Join Date: Aug 2010	it does not matter if its center-tapped . if im correct . if someone thinks im wrong please correct this .

28th February 2011, 06:49 PM	#8
DF96 diyAudio Member Join Date: May 2007	12AX7 requires 6.3V (or 12.6V). 3.15-0-3.15 is 6.3V CT. You need 6.3V, you have 6.3V - so no problem.

1st March 2011, 10:10 AM	#10
DF96 diyAudio Member Join Date: May 2007	I don't understand the question. Heaters are almost always about the voltage beween two pins, not the voltage on one pin. (minor exceptions are those valves which tie one side of the heater to the cathode, like some beam deflection mixers). You need 6.3V, you have 6.3V. What is the problem?

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