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<DIV>V4a feeds the grid of V4b. The important thing is that V4b is a
cathode follower, with its output taken from the cathode. The plate is
basically grounded (for AC) through the subject capacitor, to make the
audio appear at the cathode. The .02 cap is probably enough and more
doesn't matter much, although it might raise the bass response some.</DIV>
<DIV>WL</DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=G3OOU@aol.com href="mailto:G3OOU@aol.com">G3OOU@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=TDavid@industrialcoating.com
href="mailto:TDavid@industrialcoating.com">TDavid@industrialcoating.com</A> ;
<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> Monday, April 25, 2011 5:59
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Heath] DX-40</DIV>
<DIV><BR></DIV><FONT id=role_document color=#000000 size=2 face=Arial>
<DIV>
<DIV>
<DIV>In a message dated 25/04/2011 19:47:11 GMT Standard Time, <A
href="mailto:TDavid@industrialcoating.com">TDavid@industrialcoating.com</A>
writes:</DIV>
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<P class=MsoNormal>A DX-40 question – the DX-40 I recently acquired has a
20uF cap from pin 1 of the 6DE7 to the chassis. The schematic in
the partial manual I have doesn’t show the cap. On the chassis
side it is tied to a solder lug so it appears that some thought was given to
installing it. Can someone with a later diagram confirm if it is
correctly installed or, if not, where it should be
connected? </P>
<P class=MsoNormal>Thanks for the help!<o:p> </o:p></P>
<P class=MsoNormal>Dave Cohen, N7TC<o:p></o:p></P></FONT></BLOCKQUOTE></DIV>
<DIV>Hi Dave</DIV>
<DIV> </DIV>
<DIV>My DX40 schematic shows an 0.02uF capacitor from pin 1 of V4 to ground
but no date or version number on the sheet. Your 20uF capacitor might be an
attempt at additional decoupling in conjunction with R21 (1K). The DC is shown
as +380V at pin 1 of V4 and this will contain an audio component during
modulation.</DIV></DIV>
<DIV> </DIV>
<DIV><FONT lang=0 size=2 face=Arial PTSIZE="10"
FAMILY="SANSSERIF">73<BR></FONT><FONT lang=0 color=#0000ff size=4 face=Arial
PTSIZE="14" FAMILY="SANSSERIF"><I><BR>Bob</FONT><FONT lang=0 color=#000000
size=2 face=Arial PTSIZE="10" FAMILY="SANSSERIF"></I><BR>Bob F Burns<BR>C Eng,
FIET, MSE<BR>Amateur Radio Callsign: G3OOU<BR>Registered RSGB
Instructor<BR>G-QRP Member No: 6907; Zone: 14, QRA: IO91WH; WAB:
TQ25<BR>Secretary of 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</A></FONT></DIV></FONT>
<P>
<HR>
<P></P>_______________________________________________<BR>Heath mailing
list<BR>Heath@puck.nether.net<BR>https://puck.nether.net/mailman/listinfo/heath<BR></BLOCKQUOTE></BODY></HTML>