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The color in the option of the amplifier is different from the tube. The different tube is inserted, not the color of the chassis. The case is all stainless steel. Amplifier case, brushed stainless steel material.In view of the laser cutting of the case and the bending of the mechanical machine, the case has scratches and indentations, the picture is the same.The case materials are as follows:Material: Stainless steelThickness: 1mmProcessing: CNC laser cutting, CNC bending machine, manual welding, manual polishing.Table head 6p6p single-ended type A amplifier:

parameter:Stainless steel caseInput voltage: 220v 50hz (other voltages are individually customized: 110v 230v 240v)Output power: 4w + 4wFrequency response: 20hz-20khzInput impedance: 100kOutput impedance: 4 ohms 8 ohmsSignal to noise ratio: 89dbInput sensitivity: 500mv-2000mvHarmonic distortion: 2% (1kz)Machine volume: 330mm (length) 220mm (depth) 190mm (height)Tubes for tube amplifiers:Rectifier tube: Dawning 5z3pX1. Replacement tube: 5u4c 5z2p 5z4pa 5u3c 5z3pa 5u4g, etc.Fore tube: 6h9cx2 (Soviet Union) Other replacement tubes 6n9p 6sl7 5691, etc.Back-stage electron tube: 6p6px2 (Dawning) Replace the electron tube 6p3p el34 5881A 6v6 6l6gc6p6p tube is a small power, excellent performance power amplifier tube, known as the sound of high mountains and flowing water, clear and natural, sweet and mellow, single-ended power of about 2.8w, power consumption is less than 6p1 tube, standard connection up to 4w, in order to Both power and sound quality are taken into consideration. The machine adopts the triode and super linear connection switching method. The triode connection method has a 3.5w output sound field with a wide and sweet thickness. This is related to the 6p6p internal black carbon spray layer. The super linear output is 4w power.
Technical characteristics:With power switch, triode 3w and super linear 4w output power, switch according to the speaker at will, the effect is different. (By default, the two small switches are dialed back together. It is a triode connection 3w, both are dialed forward. It is a super linear connection 4w.)
Although the power of 6p6p is only 4w (same as the power of the 2a3 amplifier), due to the strong load capacity of the tube amplifier, a pair of medium-sized speakers can be promoted. The vocal characteristics are delicate and real, and the sound is warm and sweet. String details are subtle and dynamic.

Gold-plated rc terminal, pure copper crystal terminal, 0-4-8 ohm. With insurance three-core socket, two fuses, one spare. Randomly send a three-pin national standard power cord.

Header 5881A single-ended type A amplifier:

parameter:Stainless steel caseInput voltage: 220v 50hz (other voltages are individually customized: 110v 230v 240v)Output power: 7w + 7wFrequency response: 20hz-20khzInput impedance: 100kOutput impedance: 4 ohms 8 ohmsSignal to noise ratio: 89dbInput sensitivity: 500mv-2000mvHarmonic distortion: 2% (1kz)Machine volume: 330mm (length) 220mm (depth) 190mm (height)Rectifier tube: Dawning 5z3pX1. Replacement tube: 5u4c 5z2p 5z4pa 5u3c 5z3pa 5u4g, etc.Fore tube: 6h9cx2 (Soviet Union) Other replacement tubes 6n9p 6sl7 5691, etc.Post-stage electron tube: 5881Ax2 (Dawning Xiaofeiyan) Other replacement power 6p3p el34 6p6p 6V6

Technical characteristics:With power switch, triode 6w and super linear 7w output power, switch according to the speaker at will, the effect is different. (By default, the two small switches are dialed back together, it is 6w for triode connection, both are dialed forward, and the output power is 7w for super linear connection)
Gold-plated rc terminal, pure copper crystal terminal, 0-4-8 ohm. With insurance three-core socket, two fuses, one spare. Randomly send a three-pin national standard power cord.1: The amplifier can only (push) connect passive speakers, a pair (2) speakers is required. Cannot connect the subwoofer can not be connected to active speakers (that is, the speaker has its own amplifier, speakers with volume knob can not be connected).2: The amplifier must be connected to the speaker before the test can be started. The back stage of the amplifier should not be left unloaded. If the speaker is not connected, it will be unloaded, which will cause the primary voltage of the output transformer to rise. Burn the output transformer or tube. One, this will generate electromagnetic interference and cause the AC noise floor of the machine. It is best to use a single socket.The interior of the amplifier has been grounded, and a standard 3-hole safety seat is used.