Description
★ Parameters and specifications
One new Beijing 6N11 electronic tube is standard (can be directly replaced by ECC88, 6922, 6DJ8, 6H23 and other types of tubes), and a pair of new American GE5686 power tubes. The size of the 5686 small 9-pin tube in the US is similar to the imported 12AU7, 12AT7, 12AX7 and other tubes. The power is smaller than 6P14 and the sound quality is better than 6P14. Impedance 8 ～ 10K. Used for push-pull power up to 6 ~ 8W. This amp uses a single-ended circuit with standard connection.
Input power: 2W + 2W / 300Ω; (The volume of this amp is already very loud at 9 o'clock, even the big earphones can be easily pushed, if the volume is increased, the store will not be responsible for burning the headphones)
Frequency response: 20-30Khz (+ -1db)
Input sensitivity: 800mV
Residual noise <1mVac (with choke)
Working voltage: AC-230V-0-230V 100MA + 3.15V-0-3.15V / 3A
Power supply: 80W
Input impedance: 10KΩ
Input load impedance: 8K (Z11-EI57 * 30)
Suitable for headphone impedance: 16-600Ω
★ PCB adopts double-sided epoxy board size 215 × 57mm, board thickness 1.6mm, one point ground wiring, filament AC power supply, strong music taste, the filament wiring has been laid on the board, no need to take over and the connection between the tubes. All ground wires are grounded at one point, and the background is very quiet when the volume is turned up.
★ Assembly of imported components, fast recovery of diode rectification, the effect is similar to bile rectification. 330UF South Korea or Japan fever electrolysis + 100U Pu fever electrolysis filter, 33u400V electrolytic secondary filter, 3.3UF ERO electrodeless capacitor third filter. Multi-level CRC filtering, so the noise suppression effect is very ideal. The coupling capacitor adopts Hong Kong TE MKP film capacitor, metal film 1% copper pin precision resistance, silver plated ceramic tube base, and excellent materials. The circuit design, working point setting and circuit board wiring are carefully considered, and the reasonable layout, of course, the sound quality will be improved by using a more enthusiastic coupling capacitor.
★ The case is a red walnut log case with a thickness of 2CM and a simple and elegant style. Size: 22CM wide, 33CM deep (including RCA and knob), 9CM high.
★ Headphone socket is Yongsheng 6.5 two-channel socket, power switch is stainless steel lighted green light switch, potentiometer is Japanese ALPS 16 type A100K double-linked, knob is beech wood logs.
★ Output cattle power 4.5W, oxygen-free copper wire 3 clip 2 section winding, using Japan Kawasaki Z11 silicon steel sheet, large inductance, deep enough low frequency. The output impedance is 8Ω, and it is adapted through a resistance network to easily push any impedance headphones of 8-500Ω.
★ Power supply 80W, oxygen-free copper wire winding, silicon steel sheet made of domestic Wuhan Iron and Steel H50 black annealed sheet.
★ Filter inductance 6H 0.15A, effectively reduce the noise floor of the whole machine.
★ Pure copper gold-plated RCA seat and speaker terminal.
★ 2 knives and 3 gears switch to switch the speaker output or headphone output.
