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.
JJ Electronics Part Number:
|Body Height||49.2 mm|
|Filament Current (If)||350 / 175 mA|
|Filament Voltage (Uf)||6.3 / 12.6 V|
|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
Click each question to see its answers.
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.
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.
1 answers Will these work with the budgie tube phono preamp?
Asked by Anonymous on May 12th, 2017.
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This tubes woke up and also tamed my Blackstar HT40. Great purchase
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.
Great tube and no problems with amplified parts!
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.
Added 2 to a 6505MH and they provide a much wider range of use on the gain.
nice tube, immediately tamed my peavey valvekings harshness to cream
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.
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.
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.