FausterCraster wrote:R13 ??
what is wrong in 220E ?
I would rather say that that the ring colors are brown-black-black-red which determine the resistance value,
which would lead to a value of 10 Kiloohms.
The resistors R13 together with the capacitor C10 act as low-pass filter.
With a resistance of 220 Ohms gives a roll-off frequency of about 723 Kilohertz,
with 10 Kiloohms a roll-off frequency off about 16 Kilohertz.
This is why I believe that 10 Kiloohms are the right value,
because a low-pass filter with 723 Khz make no sense in this application but 16 Kilohertz is more likely.