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jEwservice manual download site
jEwservice manual download site
Power amplifier 6P3P for push-pull output with fixed grid vacuum and triode connection the internal resistance is greatly reduced, linear has also improved. Due to the increased damping for speakers, reducing the distortion of transient and nonlinear distortion can be reduced.jEwservice manual download site
jEwservice manual download site
Machine used full symmetric layout structure and shortest path design, row line to from Qian to Hou, weak signal to away from strong signal, main circuit and Dianyuan power circuit to separate; signal entered to using Shield line, near tubes cathode grounding points grounding; ground don't a series what, canceled grounding bus, levels alone has a article grounding line, put filtering capacitor concentrated layout, each received locations collection Yu RCA seat at point grounding (star shaped grounding); filament to with more rough of more unit glial line two unit twisted collection in together, Close to the bottom line, prevents induction AC noise. First level with DC power supply, 5V obtained after the bridge rectifier. All of resistive and capacitive components with hollow rivets, made from bakelite to the terminal block, careful planning, reasonable arrangement on top.jEwservice manual download site
jEwservice manual download site
Everything is correct can be powered on after checking, observe whether the severe fever and abnormal flame, smoke, components. Measuring voltage at all levels should be normal, and W2 is transferred to a central location, adjust the preset in the W3, W4 negative bias -55V. Power on check is passed, output terminals connected to the dummy load or speaker, then plug in the tube, connected to Dianyuan power switch, filament lit properly, warm up three minutes later, W2 Center tap to ground voltage should be around -2V, V2 cathode voltage should be between 6~9V. W3, W4, of V3, V4-cathode voltage of 0. 3V, then measure V3 and V4 gate negative pressure are equal, if not equal, gate negative pressure deviation should be substituted, as far as possible replacement. If gate negative pressure deviations are too large, although static screen flow can be adjusted to the same, but when the dynamic inconsistency, so conditions should be prepared several power amplifier tube selection match. Last digital multimeter at the amplifier output (AC mV block), open to maximum volume potentiometer, carefully adjust the W2 until the multimeter to measure noise voltage readings are minimal. After the end of commissioning, connect negative feedback circuit, when negative feedback after accession, overall stability is improved broadening frequency response, hum and noise is greatly reduced or even eliminated. This lift, very peaceful, like unopened Dianyuan power switch. Homemade and adjustment of an amp would be well done.
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