Ts808 mod problem : hum + I hear radio when off...

[keith71]

Hi every one
Yesterday, I have my ts9 reissue modded to 808 spec :
swap ta 75558 for jrc 4558
swap output resistors for 100 & 10k

This unit sound very good now, but I've some noise trouble

when guitar volume pot is off, I can hear a strong hum that stops when I got the pot open, this when pedal is on and off both.

when pedal is off, I can hear some radio in may amp....

so what's wrong ?

I hope yoiu could help me

thanks oin advance

[keith71]

no one ? really ?

[Peter Snowberg]

Welcome to the forum Keith.

Sorry I don't have answers for you, but give it a little time and I sure you will get answers.

When your pedal is humming, do you have it powered from a battery or an AC adapter? The hum with the volume all the way down is usually a sign of dirty power. Extra filtering in the supply will eliminate this.

To get rid of the radio reception, you might want to try a different cable from your guitar to the pedal as a start. If that doesn't help, you may need to add a small resistor and cap to filter the input. Just an idea.

Best of luck!

Take care,
-Peter

[Aharon]

Sample values would help here.
What's the norm?.
Aharon

[Alpha579]

Check your solder joints. One of them might be acting as a diode and picking up RF..