Vacuum Tube - 5751, JJ Electronics

JJ Electronics
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Vacuum Tube - 5751, JJ Electronics

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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.

Item ID:
JJ Electronics Part Number:
JJ Electronics
Body Height49.2 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 Diameter22 mm
Item Height56.3 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 Information
Packaging Dimensions0.9 in. × 0.9 in. × 2.3 in.
Weight (Packaging)0.05 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet475.34 KB
Questions? Contact us at [email protected], or give us a call at 480-296-0890

Product Reviews

4.92 out of 5 based on 13 reviews
dmills55 - October 4th, 2023
5 out of 5

Fantastic seller!!! Best prices online & ultra fast shipping!!! AAA+++ 🎸

Travis B - September 9th, 2023
5 out of 5

Affordable tubes that really work well in my Vox AC4 Handwired. I wanted something a bit less gainy on the extreme settings and these work and sound great. JJ tubes are a good priced standard issue type tube, work well for the money are are easy to get ordered.

John Vaughan - March 9th, 2023
5 out of 5

This tubes woke up and also tamed my Blackstar HT40. Great purchase

Timscubparts - January 6th, 2023
5 out of 5

I saw the 12AX7 comparison here at Amplified Parts and noticed the positive description of this tube and its relatively low price so gave it a try. It has a very nice warm clean tone that breaks up nicely when pushed. This would be a good tube to try out a 5751 in your V.1.

Ken Masuda - December 13th, 2022
5 out of 5

Great tube and no problems with amplified parts!

Gunner Pete - August 19th, 2022
5 out of 5

With most new tubes, I initially hate that way they sound. Takes a while for them to burn-in and sometimes I never get the sound or tone I was looking for. I've been through all sorts of new production and NOS tubes through the years. It's very rare that I will find a tube that I actually like to listen to right away. These JJ 5751's fit the category of "enjoy listening to now". I'm honestly surprised because I bought these to use as substitute for some very nice quality NOS tubes. I figured I would use the JJ 5751's for a while to preserve my expensive NOS tubes. The JJ's sound so nice, I may just leave them in there and sell the NOS tubes. Running them in a Jolida 3502S Integrated Amp, with JJ 12AT7 gold pin driver tubes s and Gold Lion KT77 power tubes.

Brian with a Peavey - May 6th, 2022
5 out of 5

Added 2 to a 6505MH and they provide a much wider range of use on the gain.

Guster Buster - September 12th, 2021
5 out of 5

nice tube, immediately tamed my peavey valvekings harshness to cream

TSB - December 4th, 2020
5 out of 5

Bought a couple of these to use in the preamp of my Orange OR-15. I really like the sound and they give you just a little more headroom range on the gain knob.

Jefferson - August 2nd, 2020
4 out of 5

So far I'm pretty pleased. Running it in V1 to calm down the preamp drive in a 15w tube combo. Definitely does the trick. Going to have to play with the other tubes a bit because the volume took a noticeable step back. Running with a JJs 12AX7MG in V2 and 12AT7 in the phase inverter.