resistor value

[asf14tomcat]

~0,07ohm (black-violet-silver-gold)
sound pretty good because stock cx500 use 2 resistor connect in parallel

[ashiekh]

How many watts can your resistor handle?

[Per Hansson]

The black band is not part of the color code, it is just there to tell you which side is the end.
This is why it's also printed at the very end of the resistor...
So I would say 0.14ohm 2%

As further evidence I desoldered a similar resistor in a CX400 just now:
red - red - silver - gold - (black)
It reads as ca 0.22ohm on a meter and that is what the resistor color code decodes as too...

[ashiekh]

And here was me thinking they increased the gap to the last band to signify which end is which.

A CX400 pulls say 4 amps, so the 0.22 Ohm resistor will be dissipating 3W; that is quite a bit of wastage (almost one percent).

[asf14tomcat]

how about this ? 0,05ohms right?

[McSteel]

Yep, that one should definitely be 0.05 Ω ± 5%

[ashiekh]

i think a few mili volt . not measure yet. research datasheet of cm6800 series . in the schematic it look like R18

R18 connects to ground...

[asf14tomcat]

Ground in here is negative (-) in the primary side. Look at negative pin of bridge diode

[ashiekh]

Now I'm all confused; how does the main current (and so the initial surge) go through R18?

And there are all sorts of resistors in series

R10, 11, 64

R12, 13

R14, 15

R16A, 17A

and I can't see a reason for it (they are not forming a voltage divider, nor is one variable)

Some components have values, others not.