Tubes, especially preamp tubes, should last half a lifetime, and well beyond a year, so we want to guarantee each customer that you get a tube that will last.įor power tubes, although we will honor any faults mentioned above, we will not accept a return for a power tube that has obviously been used for 6+ hours a day for every day of the year for one year. This policy is meant to protect the buyer from having a tube go out on them prematurely from a flaw we missed. We will not cover damage from red plating neglect, glass breakage of any kind, loose bases, or other obvious faults that are due to neglect, rough handling or egregious constant use.

We accept returns for tubes going noisy, losing output/performance prematurely, and of course losing function all together. Mounting: Three ¼-20 threaded holes, 120° apart on 57.At Fuzz Audio, all vintage/NOS vacuum tubes purchased through our website are guaranteed for one year from purchase date.Positive voltage to black terminal gives diaphragm motion toward phasing plug.Voice Coil Material: Edgewound aluminum ribbon.Diaphragm: 0.05 mm (0.002 in) pure titanium.Recommended Crossover4: 800 Hz or higher, 12 dB/octave slope minimun.

Nominal Efficiency: 25% (800 Hz to 2.5 kHz).Sensitivity: 107 dB SPL, 1 W 1 m, JBL 2344A horn2 110 dB SPL, 1 W 1 m, JBL 2370A horn2 117 dB SPL, 1 mW on plane wave tubes.Power Capacity1: 70 W continuous program above 800 Hz 100 W continuous Program above 1.2 kHz.Minimum Impedance: 5 ohms (H), 9 ohms (J) 5 kHz.Nominal Impedance: 2426H - 8 ohms 2426J - 16 ohms.The front snout may be removed (unscrewed) to allow standard 1 3/8” - 18 screw mounting.

Mounting is provided for standard 25 mm (1 in) three bolt pattern. Diaphragm assemblies are rim centered rather than pin mounted, for instant interchangeability and ease of field service. Additionally the press-fit assembly and interlocking parts assure greater resistance to the mechanical shock. Phasing plug, throat exit tube and diaphragm assemblies are identical to the previous model.Īll cast parts and tolerances are held to the same levels traditionally associated with JBL designs. The mathematically determined phasing plug consists of concentric exponential horns to minimize phase cancellations. The depth of the diamond pattern is closely controlled to provide predictable frequencies for the 2nd and 3rd normal resonance modes and for the basic suspension resonance. JBL’s exclusive suspension1, consisting of a three-dimensional diamond pattern, reduces bending stresses in the diaphragm support structure. This titanium diamond structure combines the ruggedness of phenolic and composite-type diaphragms with the outstanding frequency response of fragile aluminum and exotic metal diaphragms. The model 2426H is a professional quality high frequency compression driver which incorporates JBL's titanium diamond diaphragm.

Jbl 2426 j driver