Description
300B electronic tube pushes 845 power tube load choke, inductance 92 share, over DC 50mA, copper resistance 748 ohm.
This load choke can also be used to promote the screen output of the tube, replacing the screen resistance, which is beneficial to increase the driving force and reduce the operating voltage.
Electrode tube screen load choke coupling drive is very popular in foreign tube amplifier circuits. The inductive coupling of the choke has the advantage of transformer coupling. maihak, Delphi wind root, Siemens' famous recording studio pre-level V72, the second-level EF804S screen is the inductive load.
The load choke (screen choke) is different from the ordinary inductance. Its ideal requirements are: the AC impedance is close to infinity, the internal resistance is as small as possible, the inductance is as large as possible, the distributed capacitance and leakage inductance are as small as possible, Have a good frequency response. In terms of high-fidelity requirements, the number of turns must be more than tens of thousands of turns, which is equivalent to the process of outputting cattle. It also uses complex processes such as layering, segmentation, forward winding, and reverse winding. Leakage inductance and distributed capacitance optimize the potential difference and expand the frequency response.
The load choke inductance is through the direct current and resists the alternating current. It is used in the driving part of the electron tube, and it is reasonably effective and effective to use. Load inductive coupling and resistance-capacitance coupling are two completely different styles. Different devices have different sound effects. When used well, they have better sound than pure resistance. The effect is immediate, and there is a feeling of changing to a high-grade oil-immersed silver foil coupling capacitor. . The low-frequency elasticity is loose, the sound is atmospheric, and the charm is better than the resistive load.
The working current of the load inductor must have a certain margin, the sound will be better than the load resistance
Load choke inductance also has its shortcomings, its low frequency and high frequency gain will change with the change of frequency. It is not a panacea to match with the circuit, it is not a versatile, and its cost is not low. Assembly use and volume weight should also be carefully considered, and junior enthusiasts should use it with caution.
High-quality oxygen-free copper enameled wire winding, nylon frame, annealed Z11 EI 66X35mm iron core winding, riding clip or British Red Bull fixed, reference output transformer winding method, five clips in four series, the core is inserted with a gap.
The inductance is about 92, the copper resistance is about 748 ohms, and it can pass DC 50MA. It weighs about 1Kg / piece.
This load choke can be used for 6DJ8, 6N1, 6N8P, 6P1, 6P14, 6V6, 6p3p, EL34, 2A3 and other tube load output.
This load choke can of course also be used for DC high-voltage filtering of amplifiers, and the effect is better than ordinary choke.
