6P14 Small Electronic Management Making, 6P14 Vacuum Tube Amplifier
Keywords: 6N2, 6P14, tube, amplifier circuit
Author: Li Dong
With the digitization of the broadcast equipment, most of the electronic pipes of the stock have lost their land, especially small and medium-sized power tubes, and there are many quantities. These tubes are unfortunately, and they may use themselves to make small power electronics monitoring power. The electronic management power in the following is the use of the most common electronic tube, and the circuit diagram is shown in the front stage to receive an SRPP circuit with 6N2, ie "current adjustment push-pull circuit" also known as "single-ended parallel push circuit:" The input impedance of the circuit is high, the output impedance is low, the frequency bandwidth, the distortion is small, and the overall performance is very superior. The post-stage 6P14 is connected to a standard five-pole-based single-tube output. Stability and efficiency are high. And it is a single line tube output, and the sound quality is perfect.
The electronic pipe power discharge circuit is simple and does not require a printed circuit board, which is welded with "handwear".
The casing has a cross section of 10 × 4.5 cm to make the base of the whole machine, and drilled, slotted, spray paint, and the power transformer. Output transformers are mounted inside the base. The panel and backplane of the casing are made of ground plates, and the native outer shape is shown (omitted).
Be sure to pay attention to the specific production process:
First: The layout of the component should be the shortest line, the interference is small, and the distribution of the two channels is strictly symmetrical.
Second: The power transformer is as far as possible from the pre-premium, and the mounting angle to output transformers is perpendicular to each other to reduce electromagnetic induction to further reduce noise.
Third: The ground line should be strictly grounded, preferably the negative end of the power filter capacitor at all levels and then pick up the shell.
In addition, if only 4 Ω output terminals are output, in order to accommodate the 8Ω speaker, we can use the following method to remove the EI core, write down the gap between E and I and do not destroy the insulation paper, and take care of the secondary level. Make a record of the number of turns, with the same line lacquer wiring around the root number 2 by the number of turns of the original secondary coil is 8Ω. The winding direction must be consistent. Reinstall the transformer. Dry push is dry.
The capacitance Ca in the figure is a tantalum capacitor; RC can be converted to the iron core. The resistor is 1 W metal film resistance in addition to Rc.
This circuit uses AC power supply without power supply with DC. Although DC voltage regulatory power supply is low, the tube's filament will soon be white, corrosive, and damaged tube life. And there is no such problem. If the two ends of each tube are tried to ground, select one end of a low noise low, which is a method that is fully acceptable.
The output power of this actual active machine is about 4.2W, which is small but is a pure-based electronic management power. According to some data, it is less than 9 times the transistor amplifier. The same is true, I use homemade "Yinti" 5-inch carbon fiber woven basin low sound unit plus 1 inch soft ball top treble unit's di-intensive speaker play, it is very dynamic when listening to large strikes, and the treble is also very Transparent is clear. Use "Audio Test CD CD" test machine. Subjective sensation is basically flat between 65Hz to 16.4 kHz. The noise of this machine is also very low, and when the ear is 20 cm from the treble unit, it will be vividly hear.
Note: 6N2, 6P14 filaments are 4, 5 feet
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