[R-390] Error in Power supply Mod page.

[Phil Atchley]

Hi.
The capacitors arrived today and I'm doing the total re-cap of the =
receiver,
which is nearly finished.  I'm leaving the receiver basically unmodified
with a couple minor exceptions, most notably Solid state rectifiers and =
the
Dallas Lankford AGC mod (I've discovered it really works).

While perusing the modification page I downloaded from the=20
http://r-390a.us/R-390A_Modifications.htm website I discovered a very
glaring error in the Power supply (solid state) modification.  The =
procedure
says to connect the Cathodes pf the solid state rectifiers to <Pin 4> of =
the
tubes.  THIS SHOULD READ <PIN 3> AS PIN 4 IS A FILAMENT PIN AND IS
ESSENTIALLY GROUND FOR B+.  I'll notify the owner of the website but I
wanted to post it here in case somebody tries to do this modification
following the website info. =20

I guess the moral of the story is that if you intend to do ANY =
modification
of equipment, no matter how minor you should ALWAYS check the schematic =
to
be sure that things are as stated in the Mod procedure!  IF I had gone =
ahead
and done this and powered it up I'd have had "maximum smoke", possibly =
blown
line fuse (hopefully but also VERY LIKELY THE POWER TRANSFORMER WOULD =
HAVE
BEEN SMOKED AS THIS IS BEFORE ANY B+ FUSES IN THE SET  8^( .

73 de Phil, KO6BB

****************************************************
*  DXing THE WORLD WITH THE FOLLOWING EQUIPMENT.   *
*  RECEIVERS:                                      *
*    '67 EAC R-390/URR Surplus Receiver with a     *
*    YAESU VR-5000 Wideband,  REALISTIC DX-392.    *
*    Home built Longwave "Hybrid" CW receiver.     *
*    Others which pass thru or are waiting repair. *
*  ANTENNAS:                                       *
*    Coil Loaded 18.5 Meter Long Sloper.           *
*    Roof mounted Hustler 6BTV 6 band Vertical.    *
*    Scantenna Scanner antenna at 7 Meters high.   *
*  LOCATION: Merced, Central California.           *
****************************************************




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