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Vacuum Tube - 5751, JJ Electronics
The JJ Electronic 5751 is a dual triode that can be used in place of most 12AX7 circuits. The rugged build of this tube and reduced gain (30% less than a 12AX7) can improve headroom and give better control in high gain stages allowing users to more easily dial in sweet spots. The JJ 5751 features a smooth and balanced tone and a detailed response with low noise and low microphonics.
| Body Height | 49.2 mm | |
| Filament current (If) | 350 / 175 mA | |
| Filament voltage (Uf) | 6.3 / 12.6 V | |
| Gain (μ) | 70 | |
| Grid capacitance (cg1) | 1.6 pF | |
| Grid to plate capacitance (cg1-a) | 1.7 pF | |
| Grid voltage (Ug) | -1 V typical, -50 V min | |
| Internal resistance (Ri) | 58 kΩ | |
| Item Diameter | 22 mm | |
| Item Height | 56.3 mm | |
| Plate (anode) capacitance (ca) | 0.33 pF | |
| Plate (anode) current (Ia) | 0.8 mA | |
| Plate (anode) dissipation (Wa) | 1 W max | |
| Plate (anode) voltage (Ua) | 100 V typical, 300 V max | |
| Transconductance (s) | 1.2 mA/V |
| Packaging Dimensions | 0.9 in. × 0.9 in. × 2.3 in. | |
| Weight (Packaging) | 0.05 lbs. |
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Questions and Answers
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1 answers
Is the P-ST9-600 9-pin mini socket the correct socket for a 5751 JJ preamp tube?
Asked by mikeb4 on December 29th, 2015. 1 person subscribed to this question
December 30th, 2015
Staff MemberTop ContributorYes, the P-ST9-600 socket is compatible. Depending on your needs and specifications most 9-pin miniature sockets will work.
1 answers
What is the correct socket for the 5751 JJ preamp tube?
Asked by mikeb4 on December 29th, 2015. 1 person subscribed to this question
December 30th, 2015
Staff MemberTop ContributorDepending on your needs and specifications most 9-pin miniature sockets will work.
1 answers
Will these work with the budgie tube phono preamp?
Asked by Anonymous on May 12th, 2017. 1 person subscribed to this question
If your amp calls for a 12AX7 the 5751 should work as it is a compatible tube.
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Substitute Products
The following items can be substituted for this product. While not necessarily exactly the same, they will function as replacement items in your project.
Product Reviews
I use a 5751 in the v1 on a Fender Blues Deluxe ri. And this has made the clean channel warm and Clean.
I'm currently using one of these as V1 in a Peavey Classic 50 and it REALLY nails the Fender cleans and twang and quack, all while working well with my NOS 12AD7 in V2 for lead distortion.