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<DIV><FONT size=2>I have found out PRO tek 811A tubes are made in
china.</FONT></DIV>
<DIV><FONT size=2>not very good tubes.</FONT></DIV>
<DIV><FONT size=2>I have 8 china 811A tubes here.</FONT></DIV>
<DIV><FONT size=2>from looking at them all I see in horizontal mounting they
</FONT></DIV>
<DIV><FONT size=2>are not lined up inside.As much as 90 deg. twist in
plate.</FONT></DIV>
<DIV><FONT size=2>The filament looks ok.has springs to keep it in place durring
heating.</FONT></DIV>
<DIV><FONT size=2>The grid looks ok.</FONT></DIV>
<DIV><FONT size=2>The plate is the cheaper kind.not black plate like
</FONT></DIV>
<DIV><FONT size=2>my 811A JAN USA.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>Testing them I find emission's vary from tube to
tube.</FONT></DIV>
<DIV><FONT size=2>I did the best match I could.</FONT></DIV>
<DIV><FONT size=2>with 4 811A china tubes in a amp I find out that</FONT></DIV>
<DIV><FONT size=2>they run un-even and get a little red on one
tube.</FONT></DIV>
<DIV><FONT size=2>at max. ICAS power 1KW plate input.</FONT></DIV>
<DIV><FONT size=2>They sound ok,</FONT></DIV>
<DIV><FONT size=2>I doen't think they will last very long.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>I did try to buy SVETLANA 811A</FONT></DIV>
<DIV><FONT size=2>but no longer make.</FONT></DIV>
<DIV><FONT size=2>They still make the best 572B at a price!!</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=2>73's</FONT></DIV>
<DIV><FONT size=2>Robert Meyer</FONT></DIV>
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