2A3 20W胆机电路图设计
Amplifier Configuration
1.Overall configuration
6BM8: triode unit for voltage amplification stage -- 6BM8: pentode unit in triode connection driver -- interstage transformer -- 2A3 fixed bias -- push-pull output transformer 5Kohms.
The voltage amplification stage and driver use 6BM8 that is well-known as triode-pentode multiple-unit small power tube.
6BM8: triode unit for voltage amplification stage -- 6BM8: pentode unit in triode connection driver -- interstage transformer -- 2A3 fixed bias -- push-pull output transformer 5Kohms.
The voltage amplification stage and driver use 6BM8 that is well-known as triode-pentode multiple-unit small power tube.
2A3胆机电路图(点击看原图)
2. Output stage
The tube operation is class A2 push-pull that is driven up to grid + field in order to obtain the power efficiently out of 2A3 whose plate dissipation is 15W. Plus, fixed bias system is employed for efficient use of the supply power voltage.
The operating condition of the output stage is as follows.
The tube operation is class A2 push-pull that is driven up to grid + field in order to obtain the power efficiently out of 2A3 whose plate dissipation is 15W. Plus, fixed bias system is employed for efficient use of the supply power voltage.
The operating condition of the output stage is as follows.
Plate voltage | 320V (at 0 input), 290V (at max. output) |
Plate current | 80mA (for 2 tubes) |
Grid voltage | -65V |
Load | 5Kohms(between P-P) |
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