Brand Name:icchipcn.com
Condition:New
Type:Logic ICs
New arrivals in 2022
New 300B direct heat single-ended tube amplifier. .
The circuit of the whole machine uses the early ECC82/12bh7 to push the 300B secondary amplifier circuit.
Brand new high-end exterior design. / There is a high and low voltage switch on the front, which can turn on the low voltage filament and turn off the high voltage when the machine is warmed up, and there is no need to connect the load speaker. It is convenient to warm up in advance when going out for PK / There is also a current check and detection switch, which can check the aging degree and status of 300B at any time / Retro cat's eye blue high-voltage power indicator / The panel is all-aluminum CNC machining and full chamfering is very eye-catching. /Golden 40MM knurled solid aluminum knobs feel very good and are of high grade. /A pair of 304 stainless steel handles are installed on the body/easy to carry. You will feel very convenient when carrying it.
The interior of the machine is still fully hand-built, with good heat dissipation, easy maintenance, anti-interference and low internal resistance. . Sound effect is good.
Current standard tube: Rectifier tube: Lin Lai 5U4G*1, Power tube: Lin Lai 300B*2, Voltage amplifier tube: Noble Voice ECC82*1, Push tube: Dawning 12BH7*2
Power transformer: layered paper, 114*60 precision winding, power 300W.
Output transformer: layered paper, 96*50 precision winding, power 30W.
Machine power consumption: 120W.
Signal-to-noise ratio: 85DB has filament thermal noise. Neatly routed, reasonable design.
Noise voltage: 0.2-0.3MV (different brands and models of 300B have different noise levels)
Input Impedance: 100K
Output impedance: default 4Ω 8Ω, please contact in advance if you need to connect 16Ω.
Output power: 8 ohms 8 W per channel
Distortion: 1.5% 1w
Frequency response: 20HZ-20KHZ (-0.5DB)
15HZ-30KHZ(-1DB)
Power input: 110-120-220-230-240V
Overall size: please see the picture
Machine weight Net weight: 25KG
Weight with package: 28KG
Packaging specifications: length: 56CM*width 44CM*height 35CM
Standard configuration of the whole machine: 300B*2 /12BH7*2/ ECC82*1/5U4G*1/hood*1, manual*1, power cord*1.
1: The amplifier uses a two-stage amplifier circuit, 12AU7 is used for simple voltage amplification, (12AT7/12ax7 can be used for different magnifications and gains) 12BH7 single triode promotes 300B power amplification, with volume adjustment. It can be used directly, or externally connected to any pre-amp, pre-amplifier.
2: The unilateral output power of the amplifier is 8W/8 ohms, and the maximum power volume is at 1 o'clock. If it exceeds 1 point, overload distortion will appear as a normal phenomenon. 12AT7 and 12AX7 have different magnifications and different potentiometer positions.
3: Each power amplifier in our shop will undergo a number of tests before shipment, especially the consistency of the tubes, and the output balance will be adjusted again. Therefore, the balance at both ends of each power amplifier is at a normal level. (Unbalanced system output, different speaker angles, different tripod heights, and different environmental reflections will seriously affect the mid-frequency imaging and positioning.) If you find any imbalance, please check/adjust the speaker placement. Tilt, left and right height) whether the left and right environment is symmetrical, whether the connecting wire is loose, or the internal contact problem of the wire, whether the sound source output is normal, etc. In many home environments, the left and right asymmetry causes different reflections and affects the image formation. It is a waste of time to blindly adjust the hardware.
4: The design of the high and low voltage switches is for the convenience of the warm-up under no load, or the use of the delay buffer when the warm-up is usually turned on. If you find it troublesome to switch the machine on and off, the start switch can be placed in a high-voltage place, and you only need to dial the power switch to switch the machine on and off.
Transformer winding process: layers of backing paper, mouth-shaped skeleton, CNC precision winding, vacuum dipping paint. All through: frequency response test / inductance test / waveform test / good things are not afraid of exposure. Peel it apart for you to see inside and out, and speak with strength! ! !
Talk about hearing:
We all know that the direct heating tube is characterized by the rich and warm sound of the vocal/mid frequency band, and the more you listen, the more comfortable it is. However, different models of direct heating tubes (high, medium and low frequency) sound different. However, the 300B is better than the human voice. Many friends do 300B due to improper circuit application and the use of cheap transformers. It makes the high and low frequency bands of 300B even more missing. Therefore, 300B is either not done, and if you want to do it, you will spend the capital and take the time to do it well. This product adopts Japanese 12BH7 drive circuit, uses double triode as the drive stage, and ECC82 as the first stage voltage amplification, which greatly reduces the loss of high frequency band - 1DB high frequency can reach 30KHZ, making the sound more lively and the sound field wider. Although the high frequency is still not as good as the bypass heat pipe. But it has absolute advantages over ordinary dual triode. In terms of low frequency, this machine adopts a 30W output transformer, which makes the low frequency more full, and the volume is better than that of the side heat pipe of the same power. The capacitors are matched with each other according to the sound characteristics to make the sound more comfortable and clean.
Product features and highlights:
1: The high and low voltage switch is designed to be easy to use, and the high voltage can be turned off without load when the engine is warmed up.
2: Current monitoring, mainly to display 300B screen current, so as to check the aging state of 300B.
3: The electronic tube seat adopts a shock-absorbing structure to prevent the electronic tube filament from being oscillated by external forces.
4: Full manual symmetrical erection, including the voltage regulator circuit, also adopts the erection mode.
5: 1.5 pure iron paint shell, effective anti-interference, magnetic field generated by over-conducting transformer.
About Tube Blu-ray:
The blue light is caused by the impact of the ions on the plate (Plate) to excite the atoms in the Nickel (atom), and when the high-speed ions of Barium (barium)-Strontium (strontium) impact the atoms of the Nickel, they will collide from time to time. Electron ions in Nickel atoms. At this time, Nickel's atoms lose positive and negative ions, resulting in a positive and negative imbalance. It needs to absorb the lost ions in the adjacent electrons to restore the balance. When this happens, blue light is produced. This romantic blue light will not affect the audio and sound effects of 300B.
The blue light of the electron tube is the electron glow of the electrons emitted by the cathode of the electron tube under vacuum conditions. The cathode of the new tube has stronger emission ability and even more glow, which is normal. Not all of them.
