sb-303 LMO problem

[Rick Booth]

Edward Swynar VE3 CUI wrote:

> I wonder if there's a similar "fix" for the SB-300 receiver...?
>

The sb-303 schematic indicates the LMO output is loaded by the cable to the back panel
which should be connected to the offending 47 ohm resistor.  This sets the load on the LMO
output circuit, whatever that is, since the injection to the mixer is through a 680 ohm
resistor. The 47 ohm load should swamp the effects of the mixer.  If the sb-300 circuit is
"similar", that is the mixer tube does not significantly load the LMO wrt to 47 ohms then
the effect should be about the same with the sb-300...

If anyone has a schematic for the lmo it would be interesting to eyeball that output
circuit...I suspect it is not very robust (duh).

Rick

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