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  <h1>6V6G功率放大器（二）</h1>
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3200412632OK9text/html29Sun, 05 Aug 2001 12:25:30 GMT21"ca276d-4ef-3b6d3b3a"003HTS41263<html>
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232e6be9c82601a5bf8d884b19251cdb9ea3200412632OK9text/html29Sun, 05 Aug 2001 12:25:30 GMT21"ca276f-4ef-3b6d3b3a"003HTS41263<html>
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3200412662OK9text/html29Sun, 05 Aug 2001 12:25:30 GMT21"ca2771-4f2-3b6d3b3a"003HTS41266<html>
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2328f50c099e20fb9836e1895e187551aa923298b484b1a656e8b414058266f017e67f232ae3c46809485d55167d49d35129d8b053200412662OK9text/html29Sun, 05 Aug 2001 12:25:30 GMT21"ca2773-4f2-3b6d3b3a"003HTS41266<html>
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3200412662OK9text/html29Sun, 05 Aug 2001 12:25:30 GMT21"ca2772-4f2-3b6d3b3a"003HTS41266<html>
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2329871c16c60058d254ba54bbc1662fb3d2323f90902cf67e16250e5fbca6490f5cc0232998cfcb9ea5f303b6dbc7fd8f2b9fc323200425872OK9text/html29Sun, 29 Jul 2001 14:55:07 GMT22"10f13f0-a1b-3b6423cb"003HTS42587<html>
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<h1>电子管前级双分频器</h1>
<h3>赵娜丽 《无线电与电视》</h3>
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<p>图为衰减率为12dB/oct的电子分频器，交叉频率f<sub>c</sub>可以通过改变C<sub>1</sub>、C<sub>2</sub>、C<sub>3</sub>和C<sub>4</sub>的电容量来选择。计算公式是：C<sub>1</sub>=1.59/f<sub>c</sub>，单位为μF。C<sub>2</sub>的电容量跟C<sub>1</sub>一样，C<sub>3</sub>与C<sub>4</sub>相同，但C<sub>4</sub>的电容量仅为C<sub>1</sub>的40%。算出C<sub>1</sub>的数值后再乘以0.4便是C<sub>4</sub>的大小。如交叉频率设在160Hz，则C<sub>1</sub>=C<sub>2</sub>=0.01μF，C<sub>3</sub>=C<sub>4</sub>=0.004μF。就音质而言，电路中所用电容以纸质者听感最宜人，涤纶稍逊温暖，云母则犀利有余。纸质电容外壳上有黑圈的一端表示跟内部卷绕的铝箔外层相连，焊装时宜接在信号电位较低的一侧，可以起到一些屏蔽的作用。
<p>6C3是栅极采用框架结构的三极电子管，跨导高而噪声低，性能稳定可靠，经久耐用。WY1和WY2是充气稳压二极管，WY1的工作电压V<sub>2</sub>为150V，WY2为105V，两管的工作电流I<sub>2</sub>皆为30mA，串联使用时可获得稳定的250V直流电压供作整个电路的乙电源。6C3的灯丝由整流、滤波后的直流电点燃，电源变压器外围增设磁屏蔽罩，以上措施可使交流声的干扰减至最轻。
<p>电源变压器的铁心截面积为15cm<sup>2</sup>，可选用舌宽26mm的上品硅钢片叠厚58mm。初级用φ0.41的漆包线绕660圈，次级18V一档用φ1.00的漆包线绕55圈，220V一档用φ0.31的漆包线绕666圈。初次极之间需有一层静电屏蔽，并妥善接地。扼流圈的规格为0.6A，0.6H，直流电阻为12Ω。

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232eb556c5514078a77f0941657640e7b75232366aefd16483a4a530f7006f3c68158e2326011550dde78ed28c7971b4c44b68f6a32005133132OK9image/gif29Fri, 31 Aug 2001 13:51:40 GMT22"3d19d3-3401-3b8f966c"003HTS102323e3a694b7646697f8e032f3b18e1469e232276531b51244e2a154787c3ea276e80323201cd6775e1280936a1e4e572530526a023257b095bd7991649ed2cc59d41db79e71232ee99cc40b1de3eba8327e3a919986bfb32005107952OK9image/gif29Fri, 31 Aug 2001 13:51:41 GMT22"3d19d4-2a2b-3b8f966d"003HTS1023257d199958e4d106abcfad92b6b5e5d122329c39b3587f9198bbf0608181d4dab8db32005145942OK9image/gif29Fri, 31 Aug 2001 13:51:41 GMT22
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