seduction problem

[Ed Faulkner]

I have a Seduction phono stage (with CCS) that has a low level motorboat sound at very low levels. I have already changed PS caps and the sound persists, anyone else experienced this issue?

 

[Doc B]

Have you tried different tubes?

 

[Ed Faulkner]

Several different tubes and brands have been tried.

 

[Paul Birkeland]

How are your voltage checks?

 

[Doc B]

Did you also replace the heater supply cap, or just the high voltage caps?

 

[Ed Faulkner]

Voltages all good, heater supply cap also replaced. I need to dig in with a scope and isolate a few things, was hoping someone else had a similar issue I could shortcut from. The thing still sounds great but does not have a black background at high volume, most music swamps the sound. Will dig up the schematic again (somewhere in the shop) and plan a next move. Might even get another kit to use while fixing this one, I hate being without good sound...

 

[Doc B]

Clean the tube pins and sockets really well, and inspect the film caps for damage.

 

[Ed Faulkner]

Will do, thanks for the tip.