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<DIV><FONT size=2 face=Arial>Sometimes you can keep something going by using a
bridge rectifier on half the HV winding, if it originally used the center
tap.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Are the LV windings OK?</FONT></DIV>
<DIV><FONT size=2 face=Arial>If so, make a diode bridge with two 1KV PRV diodes
in each leg and put it across the good side of the HV winding, if one side is
still working. Hopefully it only melted in one place. Put 100K
equalizing R across each diode, if you want to be careful.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>I doubt if anyone is going to run that tx much and
certainly not on AM, so you may well get by with the quick fix.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>One sees junkers at hamfests, but I wouldn't
do the work to change a TX unless I was being paid!</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>73,</FONT></DIV>
<DIV><FONT size=2 face=Arial>Wilson</FONT></DIV>
<DIV><FONT size=2 face=Arial>W4BOH</FONT></DIV>
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style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=wb4lnm@aol.com href="mailto:wb4lnm@aol.com">John Klingelhoeffer</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=heath@puck.nether.net
href="mailto:heath@puck.nether.net">heath@puck.nether.net</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, April 22, 2012 2:14
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Heath] DX-20 Transmitter:
Results not good</DIV>
<DIV><BR></DIV><FONT color=black size=5
face="Arial, Helvetica, sans-serif">Many thanks to those who responded to the
earlier post about the DX-20 I'd been asked to look at by a fellow ham.
<DIV><BR></DIV>
<DIV>On the bench this morning, I found that the high voltage power
transformer has an open high voltage (600-0-600) secondary winding. So,
I guess the overheating did destroy that component.</DIV>
<DIV><BR></DIV>
<DIV>I'll be contacting the owner to see how he wants to proceed on this.
Other than the transformer, it is in remarkably good shape for a
transmitter of that age. </DIV>
<DIV><BR></DIV>
<DIV>My appreciation to you all for your comments. Perhaps there will be
more from this rig in the future. </DIV>
<DIV><BR></DIV>
<DIV>73 John... WB4LNM
"One of the hams from Heath"</DIV>
<DIV><BR></DIV>
<DIV><BR></DIV></FONT>
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<P></P>_______________________________________________<BR>Heath mailing
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