[R-390] E209 Test Point Voltage Is Low

Barry n4buq at knology.net
Mon Apr 24 23:59:56 EDT 2006


I've been doing some tube-pin and test-point voltage checking.  According to
the manual, E209 should have approximately -6.8V.  I'm getting approximately
1/10 of that or less.

Looking at V202 (1st mixer), the manual calls for -0.4V on pin 6.  I'm
getting a voltage pretty close to that -- approximately -0.5V.  Pin 6 is
connected to E209 via R208, a 27-ohm resistor.  How can it be that E209
should have such a larger voltage than pin 6 considering the only thing
between them is R208?

Thanks,

Barry - N4BUQ



More information about the R-390 mailing list