Hissing after modding

[Nutbox]

Hi there,
Changed the c1 cap on a xtc to a .001u orange drop and also changed r14 to a 47k resistor for a friend and after doing this he complained about a lot of hissing at highish gain ,but it amplified when the bright switch was switched on.

Does anybody know why this could be,is it to be expected with a change in cap are orange drops polarised?

Cheers

 

[Nutbox]

Anybody got any suggestions.

 

[Nutbox]

Any help would be appreciated.
Thanks

 

[Mattfig]

1/4 watt resistor?

 

[Nutbox]

Yes?

 

[Nutbox]

So is it the resistor ate fault or was you asking whether it is a 1/4watt type which it is?
Cheers

 

[Mattfig]

I was just checking...

 

[Mattfig]

Clean solder job, i.e. no bridged connections?

 

[Nutbox]

All the 4 joints that I soldered are sound .
Cheers

 

[SacredGroove]

Hi there,
Changed the c1 cap on a xtc to a .001u orange drop and also changed r14 to a 47k resistor for a friend and after doing this he complained about a lot of hissing at highish gain ,but it amplified when the bright switch was switched on.

Does anybody know why this could be,is it to be expected with a change in cap are orange drops polarised?

Cheers

Have you tried replacing the C1 cap with the original? Neither of these part changes should make that big of a difference in noticing more noise or hiss. Possibly the C1 cap because you're filtering out more low frequencies? Maybe the new cap is bad and allowing DC to pass into areas it doesn't belong, such as the gain pot?

 

[Nutbox]

Thank you sacred groove I shall give it a go