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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 Voltage (Ug) | ≥ -50 V, -1 V typical | |
| Grid capacitance (cg1) | 1.6 pF | |
| Grid to Plate Capacitance (ca/g) | 1.7 pF | |
| Internal Resistance (Ri) | 58 kΩ | |
| Item Diameter | 22 mm | |
| Item Height | 56.3 mm | |
| Plate Capacitance (ca) | 0.33 pF | |
| Plate Current (Ia) | 0.8 mA | |
| Plate Dissipation (Wa) | ≤ 1 W | |
| Plate Voltage (Ua) | ≤ 300 V, 100 V typical | |
| Transconductance (S) | 1.2 mA/V |
| Packaging Dimensions | 0.9 in. × 0.9 in. × 2.3 in. | |
| Weight (Packaging) | 0.05 lbs. |
 Specification Sheet | All Models |
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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.
December 30th, 2015
Staff MemberTop Contributor
Yes, 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.
December 30th, 2015
Staff MemberTop Contributor
Depending 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.
If your amp calls for a 12AX7 the 5751 should work as it is a compatible tube.
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 intended to tone down the gain level of my Fender HRD to lower the V1 gain level and move it to a later stage. proud to say mission accomplished. 5751 gets it done!
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.