Upgrade to shielded inductors for the power supply. I used SRR4528A-2R2Y and SRR4528A-3R3Y for repairs in build 7. I saw about a 10dB drop in the 160M spurs, similar to what I achieved with aluminum foil. They are slightly more expensive and the shield is fragile.
softerhardware
commented
5 years ago
Upgrade to shielded inductors for the power supply. I used SRR4528A-2R2Y and SRR4528A-3R3Y for repairs in build 7. I saw about a 10dB drop in the 160M spurs, similar to what I achieved with aluminum foil. They are slightly more expensive and the shield is fragile.