[Heath] DX-40

[G3OOU at aol.com]

In a message dated 25/04/2011 19:47:11 GMT Standard Time,  
TDavid at industrialcoating.com writes:

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?     
Thanks for the help!  
Dave Cohen, N7TC

Hi Dave
 
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.

 
73

Bob

Bob F Burns
C Eng,  FIET, MSE
Amateur Radio Callsign: G3OOU
Registered RSGB  Instructor
G-QRP Member No: 6907; Zone: 14, QRA: IO91WH; WAB:  TQ25
Secretary of Crystal Palace Radio & Electronics Club: _www.g3oou.co.uk_ 
(http://www.g3oou.co.uk/) 
Technical web site: _www.qsl.net/g3oou_ (http://www.qsl.net/g3oou) 
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