seduction problem

Ed Faulkner · 1285

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Offline Ed Faulkner

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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?



Offline Doc B.

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Reply #1 on: June 11, 2018, 07:03:52 PM
Have you tried different tubes?

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.


Offline Ed Faulkner

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Reply #2 on: June 12, 2018, 11:04:45 AM
Several different tubes and brands have been tried.



Offline Paul Birkeland

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Reply #3 on: June 12, 2018, 11:23:08 AM
How are your voltage checks?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline Doc B.

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Reply #4 on: June 12, 2018, 01:58:26 PM
Did you also replace the heater supply cap, or just the high voltage caps?

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.


Offline Ed Faulkner

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Reply #5 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...



Offline Doc B.

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Reply #6 on: June 14, 2018, 10:10:29 AM
Clean the tube pins and sockets really well, and inspect the film caps for damage.

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.


Offline Ed Faulkner

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Reply #7 on: June 14, 2018, 11:25:50 AM
Will do, thanks for the tip.