[Premium-Rx] RA 6790/GM(R-2174B) LSB mistuning

["Choe"]

Hi all members !

My receiver RA 6790/GM(R2174B) mistune  by -6.7KHz.
For instance, I tune to 1,000 KHz in AM mode and I press USB button then it it tunes exactly same frequency
and I can hear am signal in USB mode but  if I press LSB  Button I shuld detune -6.7KHz, it means I should tune to
993.3 KHz. Is there any body experience with similar problem or any theoretically suspected fault point ?
I can calculate 6.7=10-(1.65+1.65)KHz.

Best regards,
Choe 
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