贴一个国外网站上6SN7的排行榜，供大家参考

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<pre><font face="宋体"><b><span lang="EN-US" style="FONT-SIZE: 36pt; COLOR: black;">6SN7GT </span></b><b><span style="FONT-SIZE: 36pt; COLOR: black;">排行榜</span></b><span lang="EN-US" style="COLOR: black;"><p></p></span></font></pre><pre><span lang="EN-US" style="COLOR: black;"><font size="3"><font face="宋体">
                                        <p></p></font></font></span></pre><pre><font size="3"><font face="宋体"><span lang="EN-US" style="COLOR: black;">ECC33=CV2821 Mullard (can be subbed for a 6SN7GT, </span><span style="COLOR: black;">最大屏压<span lang="EN-US"> 300V, </span>华丽的声音<span lang="EN-US">, </span>所有管子之冠<span lang="EN-US">, 1950's)<p></p></span></span></font></font></pre><pre><font size="3"><font face="宋体"><span lang="EN-US" style="COLOR: black;">ECC32=CV181 Mullard ( </span><span style="COLOR: black;">在一定条件下可以代替<span lang="EN-US">6SN7, <span style="mso-spacerun: yes;">&nbsp;</span></span>最大屏压<span lang="EN-US"><span style="mso-spacerun: yes;">&nbsp; </span>300V, </span>华丽的声音<span lang="EN-US">, 1950's)<p></p></span></span></font></font></pre><pre><font size="3"><font face="宋体"><span lang="EN-US" style="COLOR: black;">6SN7W Sylvania "</span><span style="COLOR: black;">镀铬玻璃顶<span lang="EN-US">" 1940's ( </span>金属管座和黑色管座<span lang="EN-US">)<p></p></span></span></font></font></pre><pre><font size="3"><font face="宋体"><span lang="EN-US" style="COLOR: black;">6SN7GT/GTB/WGT Sylvania "</span><span style="COLOR: black;">镀铬玻璃顶<span lang="EN-US">" 1940's-1950's<p></p></span></span></font></font></pre><pre><font size="3"><font face="宋体"><span lang="EN-US" style="COLOR: black;">CV1988=6SN7GT/GTY Brimar </span><span style="COLOR: black;">英国<span lang="EN-US">1950's </span>和早期<span lang="EN-US">1970's (Y= </span>褐色管座<span lang="EN-US">)<p></p></span></span></font></font></pre><pre><font size="3"><font face="宋体"><span lang="EN-US" style="COLOR: black;">6SN7WGT Raytheon <span style="mso-spacerun: yes;">&nbsp;</span></span><span style="COLOR: black;">肋骨屏<span lang="EN-US"> 1950's<p></p></span></span></font></font></pre><pre><span lang="EN-US" style="COLOR: black;"><font size="3"><font face="宋体">VT-231=6SN7GT <city wst="on"><place wst="on">Sylvania</place></city>, Tungsol, Ken Rad, RCA 1940's<p></p></font></font></span></pre><pre><font size="3"><font face="宋体"><span lang="EN-US" style="COLOR: black;">5692 RCA </span><span style="COLOR: black;">红色管座<span lang="EN-US"> (</span>早期<span lang="EN-US">1950's </span>是最好的<span lang="EN-US">) <p></p></span></span></font></font></pre><pre><font size="3"><font face="宋体"><span lang="EN-US" style="COLOR: black;">5692 CBS-Hytron and Sylvania <span style="mso-spacerun: yes;">&nbsp;</span></span><span style="COLOR: black;">褐色管座<span lang="EN-US">(1957- 1960' s</span>早期<span lang="EN-US">)<p></p></span></span></font></font></pre><pre><span lang="EN-US" style="COLOR: black;"><font size="3"><font face="宋体">6SN7GT/GTB/WGT Tungsol 1950's-1960's<p></p></font></font></span></pre><pre><span lang="EN-US" style="COLOR: black;"><font size="3"><font face="宋体">6SN7GT Ken Rad<p></p></font></font></span></pre><pre><font size="3"><font face="宋体"><span lang="EN-US" style="COLOR: black;">6SN7GTA GE 1950's</span><span style="COLOR: black;">早期<span lang="EN-US">( </span>黑屏<span lang="EN-US">)<p></p></span></span></font></font></pre><pre><font size="3"><font face="宋体"><span lang="EN-US" style="COLOR: black;">6SN7GT RCA 1950's</span><span style="COLOR: black;">早期<span lang="EN-US"><p></p></span></span></font></font></pre><pre><font size="3"><font face="宋体"><span lang="EN-US" style="COLOR: black;">6SN7GTB Sylvania 1950's-1970's</span><span style="COLOR: black;">晚期<span lang="EN-US"><p></p></span></span></font></font></pre><pre><font size="3"><font face="宋体"><span lang="EN-US" style="COLOR: black;">6SN7GTB RCA <span style="mso-spacerun: yes;">&nbsp;</span>1950's-1960's</span><span style="COLOR: black;">晚期<span lang="EN-US"><p></p></span></span></font></font></pre><pre><font size="3"><font face="宋体"><span lang="EN-US" style="