<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=UTF-8" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 11.00.9600.17924"></HEAD>
<BODY id=role_body style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; COLOR: #000000"
bottomMargin=7 leftMargin=7 rightMargin=7 topMargin=7><FONT id=role_document
color=#000000 size=2 face=Arial>
<DIV>Hi George</DIV>
<DIV> </DIV>
<DIV>Check the last entry in the following:</DIV>
<DIV> </DIV>
<DIV><A
href="http://www.dslreports.com/forum/r19784002-Break-In-period-for-Chinese-572B-tubes">http://www.dslreports.com/forum/r19784002-Break-In-period-for-Chinese-572B-tubes</A></DIV>
<DIV> </DIV>
<DIV><FONT lang=0 size=2 face=Arial FAMILY="SANSSERIF"
PTSIZE="10">73<BR></FONT><FONT lang=0 color=#0000ff size=4 face=Arial
FAMILY="SANSSERIF" PTSIZE="14"><I><BR>Bob</FONT><FONT lang=0 color=#000000
size=2 face=Arial FAMILY="SANSSERIF" PTSIZE="10"></I><BR>Bob F Burns G3OOU,
G-QRP 6907, @BobFBurns<BR>Crystal Palace Radio & Electronics Club: <A
href="http://www.g3oou.co.uk/">www.g3oou.co.uk</A><BR>Technical web site: <A
href="http://www.qsl.net/g3oou">www.qsl.net/g3oou
<DIV> </DIV>
<DIV>
<DIV>In a message dated 10/08/2015 11:01:47 GMT Standard Time, gjcollins@cox.net
writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" color=#000000 size=2 face=Arial>
<P dir=ltr><SPAN lang=en-us><FONT face=Arial>Hello Group,</FONT></SPAN></P>
<P dir=ltr><SPAN lang=en-us><FONT face=Arial>I have a few 572B’s that having
been unused for unknown lengths of time, probably several years. It is
possible to getter this tubes be for putting them into service in order to
avoid arcing or flash over? Are there any other measures that can be taken
with the 572B’s to avoid failures at startup? I plan to use these tubes in an
SB-200 amp. The amp is working now, but the tubes are weak. The replacements I
have are either New Old Stock or “good” used.</FONT></SPAN></P>
<P dir=ltr><SPAN lang=en-us><FONT face=Arial>Thanks and 73,</FONT></SPAN></P>
<P dir=ltr><SPAN lang=en-us><FONT face=Arial>George, KC1V</FONT></SPAN></P>
<P dir=ltr><SPAN lang=en-us></SPAN><SPAN lang=en-us></SPAN><SPAN
lang=en-us></SPAN></P><BR><BR>_______________________________________________<BR>Heath
mailing
list<BR>Heath@puck.nether.net<BR>https://puck.nether.net/mailman/listinfo/heath<BR></FONT></BLOCKQUOTE></DIV></A></FONT></DIV></FONT></BODY></HTML>