• We would like to remind our members that this is a privately owned, run and supported forum. You are here at the invitation and discretion of the owners. As such, rules and standards of conduct will be applied that help keep this forum functioning as the owners desire. These include, but are not limited to, removing content and even access to the forum.

    Please give yourself a refresher on the forum rules you agreed to follow when you signed up.

AC vs DC power supply parameter. Try it :)

npx

Inspired
My favourite reason for switching the power supply parameter to DC is to get rid of ghost notes found on certain models. Yes, the ghosting is authentic, but it's great to be able to eliminate it when the need arises!
 

Tex Axe

Experienced
Wild Just saw that and wondered about it..
50 watt Marshalls were notorious for Ghost notes
and some 100s I was told if real bad the caps were going..
wont ever have to worry about that again..
 

FractalAudio

Administrator
Fractal Audio Systems
Moderator
A lot of the character of these amps are the sloppy power supplies and ghost notes. Take that away and they sound flat and dimensionless.

For example, take the Plexi 100W models. Ghost notes like crazy. Turn up the gain a bit and play an E on the G string. You'll hear the ghost note. Now increase B+ Time Constant (or decrease Supply Sag). The ghost note will go away but so will some of the mojo.
 

FractalAudio

Administrator
Fractal Audio Systems
Moderator
Wild Just saw that and wondered about it..
50 watt Marshalls were notorious for Ghost notes
and some 100s I was told if real bad the caps were going..
wont ever have to worry about that again..
100 watters are usually worse because they have lighter filtering (50 uF vs. 100 uF) and draw more dynamic current.
 

eljodon

Experienced
I have 2 Plexis and they have quite a bit of ghost notes. My BE100 and PT100 doesn't have much of it because they use heavy filtering. I wonder if the other reason might be because the Plexi's have to be on 8 to 10(non master volume) to get some gain out of them?
 
Top Bottom