请教下图输出电压的峰峰值
本人菜鸟，不会计算，请高手帮忙算算下图输出电压的峰峰值，谢谢。 这个图 这个图皋城瑶珄 发表于 2012-11-12 15:58 http://bbs.hifidiy.net/images/common/back.gif
采用简单计算：Out Vpp大约106V，Vrms大约37V 回复 3# 路遥plus
路版采用简单计算竟与模拟仿真相同！:victory:6V6GT
Beam Power Amplifier
EIA Base & Outline
Substitute Data
Preferred Substitutes ......................... 7408
Substitutes ................................... 1614
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Application
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Glass octal type used as output amplifiers in automobile, battery-operated, and other receivers in which reduced plate-current drain is desirable. Requires octal socket and may be mounted in any position.
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It is equivalent in performance to type 6AQ5. Refer to type 6AQ5 for characteristic curves.
Mechanical Data
-------------------------------
Bulb .......................................... T-9
Base Type ..................................... Int or short Int Octal
EIA Outline ................................... 9-11 9-41
EIA Base ...................................... 7S
Mounting Position ............................. Any
Electrical Data
-------------------------------
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.45 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component .............................. 90 V
Heater Negative with Respect to Cathode
DC Component .............................. 90 V
Direct Interelectrode Capacitances (approx)
Pentode
-------------------------------
Input ......................................... 9.5 pf
Output ........................................ 7.5 pf
Grid to Plate ................................. 0.7 pf
Maximum Ratings (Design Center Values)
Pentode
-------------------------------
Plate Voltage ................................. 315 V
Grid No. 2 Voltage ............................ 285 V
Plate Dissipation ............................. 12 W
Grid No. 2 Dissipation ........................ 2 W
Characteristics and Typical Operation
Class A Amplifier
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Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 180 V
Grid No. 1 Voltage ............................ -8.5 V
Peak Grid No. 1 Voltage........................ 8.5 V
Plate Resistance (approx) ..................... 58K Ω
Transconductance .............................. 3700 ?
Plate Current (Zero Signal) ................... 29 mA
Plate Current (Maximum Signal) ................ 30 mA
Grid No. 2 Current (Zero Signal) .............. 3 mA
Grid No. 2 Current (Maximum Signal) ........... 4 mA
Load Resistance ............................... 5.5K Ω
Power Output (approx) ......................... 2 W
Total Harmonic Distortion ..................... 8 %
Class A Amplifier
-------------------------------
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -12.5 V
Peak Grid No. 1 Voltage........................ 12.5 V
Plate Resistance (approx) ..................... 52K Ω
Transconductance .............................. 4100 ?
Plate Current (Zero Signal) ................... 45 mA
Plate Current (Maximum Signal) ................ 47 mA
Grid No. 2 Current (Zero Signal) .............. 4.5 mA
Grid No. 2 Current (Maximum Signal) ........... 7 mA
Load Resistance ............................... 5K Ω
Power Output (approx) ......................... 4.5 W
Total Harmonic Distortion ..................... 8 %
Class A Amplifier
-------------------------------
Plate Voltage ................................. 315 V
Grid No. 2 Voltage ............................ 225 V
Grid No. 1 Voltage ............................ -13 V
Peak Grid No. 1 Voltage........................ 13 V
Plate Resistance (approx) ..................... 77K Ω
Transconductance .............................. 3750 ?
Plate Current (Zero Signal) ................... 34 mA
Plate Current (Maximum Signal) ................ 35 mA
Grid No. 2 Current (Zero Signal) .............. 2.2 mA
Grid No. 2 Current (Maximum Signal) ........... 6 mA
Load Resistance ............................... 8.5K Ω
Power Output (approx) ......................... 5.5 W
Total Harmonic Distortion ..................... 12 %
Class AB1 Amplifier
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Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -15 V
Peak Grid No. 1 Voltage........................ 30 V
Plate Resistance (approx) ..................... 60K Ω
Transconductance .............................. 3750 ?
Plate Current (Zero Signal) ................... 70 mA
Plate Current (Maximum Signal) ................ 79 mA
Grid No. 2 Current (Zero Signal) .............. 5 mA
Grid No. 2 Current (Maximum Signal) ........... 13 mA
Load Resistance ............................... 10K Ω
Power Output (approx) ......................... 10 W
Total Harmonic Distortion ..................... 5 %
Class AB1 Amplifier
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Plate Voltage ................................. 285 V
Grid No. 2 Voltage ............................ 285 V
Grid No. 1 Voltage ............................ -19 V
Peak Grid No. 1 Voltage........................ 38 V
Plate Resistance (approx) ..................... 65K Ω
Transconductance .............................. 3600 ?
Plate Current (Zero Signal) ................... 70 mA
Plate Current (Maximum Signal) ................ 92 mA
Grid No. 2 Current (Zero Signal) .............. 4 mA
Grid No. 2 Current (Maximum Signal) ........... 13.5 mA
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 14 W
Total Harmonic Distortion ..................... 3.5 %
Class C Amplifier/Oscillator
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Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -45 V
Grid No. 1 Current ............................ 2.5 mA
Plate Current ................................. 60 mA
Grid No. 2 Current ............................ 7.5 mA
Driving Power ................................. 0.3 W
Power Output (approx) ......................... 12 W
Class C Modulated Amplifier (Plate)
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Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -45 V
Grid No. 1 Current ............................ 2 mA
Plate Current ................................. 60 mA
Grid No. 2 Current ............................ 6 mA
Driving Power ................................. 0.4 W
Power Output (approx) ......................... 10 W6V6推动电路
输出电压
输入阻抗
输出阻抗
回复 3# 路遥plus
谢谢路版，如果需要输出峰峰值170V，电路还需要做哪些调整？ 回复 4# mld
谢谢，再麻烦兄弟帮忙算下如果供电350V，屏极负载、阴极电阻多大能输出峰峰值170V？ 本帖最后由 mld 于 2012-11-13 22:55 编辑
回复 6# 皋城瑶珄
你要的这个170Vp-p值应该闭环考虑才是，单元电路在插入系统后情况会很不一样的...
波形图：
电路图：
测试值：
HarmonicFrequency Fourier Normalized Phase Normalized
Number Component Component Phase
1 1.000e+03 8.616e+01 1.000e+00 -179.61° 0.00°
2 2.000e+03 3.270e-01 3.795e-03 90.37° 269.97°
3 3.000e+03 2.712e-02 3.148e-04 -178.39° 1.22°
4 4.000e+03 2.286e-03 2.653e-05 -44.46° 135.15°
5 5.000e+03 6.265e-03 7.272e-05 2.41° 182.01°
6 6.000e+03 1.190e-03 1.381e-05 -17.19° 162.42°
7 7.000e+03 2.815e-03 3.267e-05 -174.34° 5.26°
8 8.000e+03 7.763e-04 9.010e-06 12.41° 192.02°
9 9.000e+03 3.535e-03 4.103e-05 4.26° 183.87°
Total Harmonic Distortion: 0.380953%
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v_in: PP(v(in))=21.9945 FROM 0 TO 0.005
v_out: PP(v(out))=172.323 FROM 0 TO 0.005 回复路遥plus
路版采用简单计算竟与模拟仿真相同！6V6推动电路
输出电压
输入阻抗 ...
mld 发表于 2012-11-13 14:18 http://bbs.hifidiy.net/images/common/back.gif
呵呵，因为LZ的电路已经给出屏流，我就偷偷懒，用下式估算:
Vo= 15mA x 10K x 25%=37.5Vrms
Vpp=37.5Vrms x 2.828=106Vpp
如果效率按27.5%算，那就真的与仿真数值差不多一样了：
Vo=15 x 10 x 27.5%=41.25Vrms = 116.65Vpp
取25%虽然保守了些，但输出信号失真度相对就小些。 ...因为LZ的电路已经给出屏流，我就偷偷懒，用下式估算:
Vo= 15mA x 10K x 25%=37.5Vrms
Vpp=37.5Vrms x 2.828=106Vpp
如果效率按27.5%算，那就真的与仿真数值差不多一样了：
Vo=15 x 10 x 27.5%=41.25Vrms = 116.65Vpp
取25%虽然保守了些，但输出信号失真度相对就小 ...
路遥plus 发表于 2012-11-14 04:07 http://bbs.hifidiy.net/images/common/back.gif
这些都是以前学过的，看来我得回头恶补... 本帖最后由 皋城瑶珄 于 2012-11-14 17:11 编辑
回复 8# 路遥plus
那计算出的116V峰值，是否和下图的动态阻容曲线图Q点是一样的？ 本帖最后由 皋城瑶珄 于 2012-11-14 20:56 编辑
回复 9# mld
请老兄看看
用这个图来推单端300B的，该300B栅负压为-85V/屏流80MA，经过下图红线改动后推300B有无问题？
【6J8P阴极加了旁路电容】【6P6P推动改成400V电压供电】
峰值改成175VP-P/20MA/栅负压-16V 回复路遥plus
那计算出的116V峰值，是否和下图的动态阻容曲线图Q点是一样的？
皋城瑶珄 发表于 2012-11-14 17:09 http://bbs.hifidiy.net/images/common/back.gif
是的. 本帖最后由 皋城瑶珄 于 2012-11-14 22:36 编辑
回复 12# 路遥plus
请斑竹看看这张图骑马6N8VPP是否能推动11楼的300B,
画红圈是推动部分，该极Vrms和VPP 分别为多少？ 回复路遥plus
请斑竹看看这张图骑马6N8VPP是否能推动11楼的300B,
画红圈是推动部分，该极Vrms和 ...
皋城瑶珄 发表于 2012-11-14 21:05 http://bbs.hifidiy.net/images/common/back.gif
这个SRPP推动电路所标的阴极电压应该是错的（1.7V/4.7K=0.36mA???)，实际上应该是1.3mA左右才对。
这个电路大约可以输出75Vrms即210Vpp左右。应该可以推得动后面的300B，但推得好不好就要试过先知。 本帖最后由 皋城瑶珄 于 2012-11-18 20:16 编辑
回复 14# 路遥plus
请教版主这个骑马咋算的？
RK1/RK2是4.7K，其他咋算？？？？？？？？？？？？
阴极电阻
RL = 负載（SRPP为定负载）
Rk1 = Rk2 = (2RL+ ra) / mu
靜態电流
Iq = HT / (2ra + 2muRk)
输出阻抗
Zout = (ra + 2Rk) /
放大量:
∵ 2Iq←每管
2(2Iq)RL = Eo（输出）
2IqRk = Ei（输入）
∴ A = Eo / Ei
电压方面尽量靠近最大工作点
下面是另位版主算式，俺贴过来没有图摸不清楚咋算骑马推动？？？？？？？？？？？
阴极电阻
RL = 68KΩ = Rg（300B）
Rk1 = Rk2 = (2RL+ ra) / mu
Rk1 = Rk2 = (2*68KΩ+44KΩ)/70 = 2.57KΩ
* * 或用上面方法定 Rk，如: 1.8KΩ
靜態电流
Iq = HT / (2ra + 2muRk)
Iq = 500V/(2 x44K+2x70*2.57) = 1.12mA
* * Iq = 500V/(2 x44K+2x70*1.8K) = 1.47mA
输出阻抗
Zout = (ra + 2Rk) /
Zout = (44K+2x2.57K)x/
Zout = 24.57KΩ
* * Zout = (44K+2x1.8K)x/
* * Zout = 23.8KΩ
放大量:
∵ 2Iq←每管
2(2Iq)RL = Eo（输出）
2x(2x1.12mA)x68K = 304.6V（输出）
* * 2x(2x1.47mA)x68K = 399.84V（输出）
2IqRk = Ei（输入）
2x1.12mAx2.57K = 5.76V（输入）
* * 2x1.47mAx1.8K = 5.3V（输入）
∴ A = Eo / Ei
∴ A = 304.6V/5.76V = 53倍
* * ∴ A = 399.84V/5.3V = 75.44倍 兄弟。你好！刘际军要你给他打个电话
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