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12AX7 comparison at a glance

Rated 0 - 5 where 0 is Unacceptable and 5 is Excellent

Grey rows represent discontinued and unavailable tubes.

Manufacturer 
Model
 Microphonics 
Noise(Hiss, Pop, Hum)
Musical Detail and Dynamics
Electro-Harmonix
12AX7
5
3
4
Gold Lion
ECC83 / B759
4
5
5
JAN-GE

12AX7WA
4
5
5
JAN-GE
5751
5
5
4
JJ Electronic

12AX7 / ECC83-S
3
4
4
JJ Electronic

ECC803-S
4
4
4
JJ Electronic

ECC83-MG
4
5
4
JJ Electronic

5751
5
5
3
Mullard Reissue
12AX7
5
5
4
Mullard Reissue

CV4004 / 12AX7
5
5
4
Northern Electric
12AX7
4
5
5
Preferred Series
7025
5
5
5
RFT

ECC83
5
4
5
Shuguang

12AX7A
3
4
3
Shuguang

12AX7B
4
4
3
Sovtek
12AX7-WA
5
2
2
Sovtek
12AX7-WB
5
2
2
Sovtek
12AX7-LPS
3
4
5
Sovtek
5751
2
5
4
Svetlana
12AX7
5
5
4
Tung-Sol
12AX7
5
4
5
Ei
12AX7 / ECC83
2 and 4
5
5
JAN-Philips
12AX7-WA
4
4
5
JAN-Philips
5751
4
5
4


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