The author chose FD422 tube (direct heating type of FU7 tube) to make a class A single-ended power amplifier, with a speaker with a sensitivity of 91dB, the sound is extraordinary.
The mono circuit is shown in the figure, and the other channel is the same. The front stage uses 6J1 tube, the power amplifier tube uses Dawning FD422, the similar tube has Nanjing FD422, FU25, and the inlet tube has 2E22, 2P22 and so on. The FD422 parameter is the filament 6.3?0. 9A, the maximum anode voltage is 750V (screen current 55mA), the screen consumption is 40W, and the maximum class A output power is estimated to be 40W × 1/3 according to the screen consumption, which is about 13.3W. The output transformer is selected from Changsha Meile Electronics Factory, the model is 3. 5k/30A, and the frequency response is 20Hz~54kHz. The power transformer has a capacity greater than 180VA and a shield is added. Electrolytic use of domestic old-fashioned aluminum shell Tianhe brand, coupling capacitor with oil-immersed capacitor. After the welder has been adjusted, it will be successful several times.
Antenk dip plug connector Insulation Displacement termination connectors are designed to quickly and effectively terminate Flat Cable in a wide variety of applications. The IDC termination style has migrated and been implemented into a wide range of connector styles because of its reliability and ease of use. Click on the appropriate sub section below depending on connector or application of choice.the pitch range from 1.27mm,2.0mm, and 2.54mm here.
IDC DIP Plug Connectors Key Specifications/Special Features:
Materials:
Insulator: PBT, glass reinforced, rated UL94V-0
Contact: phosphor bronze or brass
Electrical specifications:
Pitch: 1.27/2.0/2.54mm
Current rating: 1A, 250V AC
Contact resistance: 30M Ohms (maximum)
Insulation resistance: 3,000M Ohms, minute
Dielectric withstanding voltage: 500V AC for one minute
Operating temperature: -40 to +105 degrees Celsius
Terminated with 1.27mm pitch flat ribbon cable
Number of contacts: 06,08, 10, 12, 14, 16, 20, 24, 26, 30, 32,34, 40, 50, 60 and 64P
With RoHS mark
Used for ribbon cables
DIP Plug Connectors Application
Wire to Board
Apply to Industries : PC, IPC, Consumer Electronics, Automotive, Home Appliance, Medical
Dip Connector,Dip Plug Connector,Dip Direct Pulg Connector,IDC Plug Connector,Idc connector dip plug,1.27mm Dip Plug Connector,2.0mm Dip Plug Connector, and 2.54mm Dip Plug Connector
ShenZhen Antenk Electronics Co,Ltd , https://www.pcbsocket.com