Bad old deteriorated cable?stephenl wrote:If I pull the guitar cable out, grounding the input, the noise goes away.
Help needed in solving high pitch noise
Moderators: pompeiisneaks, Colossal
Re: Help needed in solving high pitch noise
He who dies with the most tubes... wins
Re: Help needed in solving high pitch noise
*Could*, yes - do you see any oscillations on the screen supply?stephenl wrote:The screens are fed from a mosfet amplified zener stabilizer...could that be inducing the noise?
Are the screen resistors on the socket, too?
Re: Help needed in solving high pitch noise
I scoped the screen supply - its stable as a rock.
Steve
Re: Help needed in solving high pitch noise
Mystery solved 
It wasn't the cables, but I did have a boost pedal in the circuit. The pedal was off and has a hardwired bypass. The pedal is powered from a OneSpot supply - once I unplugged the OneSpot the noise disappeared.
It wasn't the cables, but I did have a boost pedal in the circuit. The pedal was off and has a hardwired bypass. The pedal is powered from a OneSpot supply - once I unplugged the OneSpot the noise disappeared.
Steve
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Stevem
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Re: Help needed in solving high pitch noise
First rule of trouble shooting, just the guitar or a signal gen gets plugged into the amp!
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!