<html><body><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:12pt"><div style="RIGHT: auto"><SPAN style="RIGHT: auto">Don't know if it's true, but I once read that the reason the HP-23 later <VAR id=yui-ie-cursor></VAR>became a PS-23 was due to a complaint from Hewlett Packard. They didn't like Heath/Zenith using "HP" once they got into the computer business.</SPAN></div>
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<div style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; FONT-FAMILY: verdana, helvetica, sans-serif; COLOR: rgb(0,0,0); FONT-SIZE: 16px; RIGHT: auto"><SPAN style="RIGHT: auto">Allen, W9DZ</SPAN></div>
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<DIV style="BORDER-BOTTOM: #ccc 1px solid; BORDER-LEFT: #ccc 1px solid; PADDING-BOTTOM: 0px; LINE-HEIGHT: 0; MARGIN: 5px 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; FONT-SIZE: 0px; BORDER-TOP: #ccc 1px solid; BORDER-RIGHT: #ccc 1px solid; PADDING-TOP: 0px" class=hr contentEditable=false readonly="true"></DIV><FONT size=2 face=Arial><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Glen Zook <gzook@yahoo.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> Dave Edwards <kd2e@comcast.net>; "heath@puck.nether.net" <heath@puck.nether.net> <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, April 23, 2013 2:10 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [Heath] SB-110A<BR></FONT></DIV>
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<DIV><SPAN>None of the HP-23- series of power supplies has a switch for "bias"! The HP-23 and HP-23A have fixed bias and a variable bias. The HP-23B, HP-23C, and the PS-23 have only fixed bias. The HP-23A and HP-23B have a toggle switch to switch between 250 VDC and 300 VDC. The HP-23, HP-23C, and PS-23 require an internal connection to determine if the lower B+ is 250 VDC or 300 VDC.</SPAN></DIV>
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<DIV style="RIGHT: auto">Glen, K9STH<BR><BR></DIV></DIV></DIV></DIV></DIV></DIV></DIV></BLOCKQUOTE></div></body></html>