📄 tube_line_preamplifier_progect_1_english.htm
字号:
<html>
<head>
<meta name="GENERATOR" content="Microsoft FrontPage 3.0">
<title>Tube Line Preamplifier Progect 1 English</title>
</head>
<body bgcolor="#FFF9F2">
<table border="0" width="100%">
<tr>
<td width="100%"> <div align="left"><table border="0" width="100%">
<tr>
<td width="100%" bgcolor="#800000"><p align="center"><em><font color="#FFFF00"><big><strong><big>
</big>Tube Line <a name="Preamplifier">Preamplifier</a> Project</strong></big><small><small>
</small> </small></font></em></td>
</tr>
</table>
</div><div align="left"><table border="0" width="100%">
<tr>
<td width="100%" bgcolor="#FFFFFF"><p align="center"><img
src="Tube_line_preamplifier_1.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/Tube_line_preamplifier_1.gif" width="751" height="635"
alt="Tube_line_preamplifier_1.gif (22844 bytes)"></p>
<p align="center"><strong>Fig.1</strong></td>
</tr>
</table>
</div><div align="left"><table border="0" width="100%">
<tr>
<td width="100%"><font FACE="Verdana" SIZE="2" COLOR="#800000">The interest for circuits
of tubes, remains big. Thus I will give completed in enough big degree, circuit of
preamplifier. It is mainly constituted by the department of <a href="#Preamplifier">main
preamplifier</a>, the department of <a href="#Delay">input selector</a>, <a href="#Delay">delay</a>
of application voltage and connection output of preamplifier with the final amplifiers and
the department <a href="#Supply">power supply</a>. The department of mainly preamplifier
appears in the Fig.1. Deliberately it does not have something revolutionary in the
designing. In the entry exists a simple circuit constituted from relay that is drive from
input selector [<a href="#Delay">S2</a>]. The signal afterwards drive to the next stage
that is constituted by a circuit cascade S.R.P.P (shunt regulated push杙ull) and a
circuit cathode repeater, in the exit. As S.R.P.P used the double triode ECC82 (U1a-b), in
connection 憭series 憭 of two triode, with characteristically pentode . The
circuit was used as department of input R.F, in the old televisions with tubes, offers big
input impedance and very good response in the high frequencies. In the circuit preferred
use capacitors with big capacity in various points and capacitors of polypropylene or MKT.
in the exits of tubes, for better quality of sound and response in low frequencies. Exists
a simple circuit for the VOLUME and BALANCE potesometer, that is should be very good
quality. In the exit exists a circuit Cathode Repeater, that is constituted by the half
department of tube ECC81 (U2a). Here exists a particularity. Whoever wants it can use the
one of half tube for a other channel and half for the other channel. We can however use
his other half tube of channel, leaving him inutile, placing a output tube for each
channel. This becomes in order to we avoid his effect of channel in the other, if we use
the same tube ,for two channels. It抯 known that the tubes, do not have very good
separation, when find itself the two departments, in the same integument. The choice is
yours. In this stage are found also the contacts of <a href="#Preamplifier">RL6</a>, who
connect the exit of line preamplifier in the final amplifier, with such certain time
delay, so that are not heard annoying noises, when open or close the preamplifier. The RL6
closes after have been stabilised and applied, all the voltages of circuit. All the relay
of SEL. and OUTPUT, should be very good quality. The circuit of control appears in circuit
SEL - DELAY, (<a href="#Delay">Fig.2</a>). . </font><table border="0" width="100%">
<tr>
<td width="33%"></td>
<td width="33%" bgcolor="#FFFF80"><p align="center"><font face="Arial" color="#800000"><small><strong>Part
List</strong></small></font></td>
<td width="34%"></td>
</tr>
<tr>
<td width="33%"></td>
<td width="33%"></td>
<td width="34%"></td>
</tr>
</table>
</td>
</tr>
</table>
</div><div align="left"><table border="0" width="100%">
<tr>
<td width="100%"><div align="left"><table border="0" width="100%">
<tr>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">R1-7=1M<small>ohm</small></font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">R12-13=100<small>ohm</small></font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">C9=4.7uF 250V*</font></small></td>
</tr>
<tr>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">R2=100K<small>ohm</small> 1W</font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">C1=220nF 250V*</font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">U1=<a href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm"
target="_blank"><strong>ECC82</strong></a></font></small></td>
</tr>
<tr>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">R3-8=1K<small>ohm</small> 1W</font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">C2=220pF ceramic or mylar</font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">U2=<a href="database.htm" tppabs="http://users.otenet.gr/~athsam/database.htm"
target="_blank"><strong>ECC81</strong></a></font></small></td>
</tr>
<tr>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">R4=1.2K<small>ohm</small> 1W</font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">C3=2.2uF 350V*</font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">RV1=2X100K<small>ohm</small>
log.</font></small></td>
</tr>
<tr>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">R5-11=5.6K<small>ohm</small>
2W</font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">C4=1000uF 16V</font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">RV2=2X100K<small>ohm</small>
lin.</font></small></td>
</tr>
<tr>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">R6=100K<small>ohm</small></font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">C5-6=2X50uF 450V</font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">RL1....6=Relay 12V 2X2 [1A] </font></small></td>
</tr>
<tr>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">R9=22K<small>ohm</small></font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">C7=1uF 250V*</font></small></td>
<td width="34%" bgcolor="#FFFFE1"></td>
</tr>
<tr>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">R10=100K<small>ohm</small></font></small></td>
<td width="33%" bgcolor="#FFFFE1"><small><font face="Verdana">C8=220nF 630V</font></small></td>
<td width="34%" bgcolor="#FFFFE1"><small><font face="Verdana">*polypropylene or MKT</font></small></td>
</tr>
<tr>
<td width="100%" bgcolor="#FFFFFF" colspan="3"><table border="0" width="100%">
<tr>
<td width="33%"></td>
<td width="33%" bgcolor="#FFFF80"><p align="center"><font color="#800000"><strong>Input
Selector - <a name="Delay">Delay</a> Drive</strong></font></td>
<td width="34%"></td>
</tr>
</table>
</td>
</tr>
</table>
</div></td>
</tr>
</table>
</div><div align="left"><table border="0" width="100%">
<tr>
<td width="100%" bgcolor="#FFFFFF"><p align="center"><img
src="Tube_line_preampl_sel_delay_1.gif" tppabs="http://users.otenet.gr/~athsam/Circuits/Tube_line_preampl_sel_delay_1.gif" width="745" height="527"
alt="Tube_line_preampl_sel_delay_1.gif (19321 bytes)"></p>
<p align="center"><strong>Fig.2</strong></td>
</tr>
</table>
</div><div align="left"><table border="0" width="100%">
<tr>
<td width="100%"><font FACE="Verdana" SIZE="2" COLOR="#800000"><p ALIGN="JUSTIFY">In the
Fig. 2, you see the department that concerns the control of input sel. relay and the
circuit of time delay. The drive of inputs choice Relay becomes from selector S2, that
drive the corresponding Relay (<a href="#Preamplifier">Fig. 1</a>), via the JF3/1⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -