Bottlehead Forum

General Category => General Discussion => Topic started by: Ed Faulkner on June 11, 2018, 05:31:31 PM

Title: seduction problem
Post by: Ed Faulkner on June 11, 2018, 05:31:31 PM

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?

Title: Re: seduction problem
Post by: Doc B. on June 11, 2018, 07:03:52 PM

Have you tried different tubes?

Title: Re: seduction problem
Post by: Ed Faulkner on June 12, 2018, 11:04:45 AM

Several different tubes and brands have been tried.

Title: Re: seduction problem
Post by: Paul Birkeland on June 12, 2018, 11:23:08 AM

How are your voltage checks?

Title: Re: seduction problem
Post by: Doc B. on June 12, 2018, 01:58:26 PM

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

Title: Re: seduction problem
Post by: Ed Faulkner on June 14, 2018, 09:26:51 AM

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...

Title: Re: seduction problem
Post by: Doc B. on June 14, 2018, 10:10:29 AM

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

Title: Re: seduction problem
Post by: Ed Faulkner on June 14, 2018, 11:25:50 AM

Will do, thanks for the tip.