Bảng đánh giá bóng 12AX7

12AX7 comparison at a glanceRated 0 
-  5 where 0 is Unacceptable and 5 is Excellent
Rows in gray are tubes used for reference

Manufacturer	Model	Microphonics	Noise(Hiss, Pop, Hum)	Musical Detail and Dynamics
Tung-Sol	12AX7	5	4	5
Preferred Series	7025	5	5	5
Gold Lion	ECC83 / B759	4	5	5
Northern Electric	12AX7	4	5	5
Mullard Reissue	12AX7	5	5	4
Svetlana	12AX7	5	5	4
Electro-Harmonix	12AX7	5	3	4
Sovtek	12AX7-WA	5	2	2
Sovtek	12AX7-WB	5	2	2
Sovtek	12AX7-LPS	3	4	5
Sovtek	5751	2	5	4
JAN-GE	5751	5	5	4
JAN-Philips	5751	4	5	4
JAN-Philips	12AX7-WA	4	4	5
Tesla / JJ	12AX7 / ECC83-S	3	4	4
Ei	12AX7 / ECC83	2 and 4	5	5