In some amps with triode/pentode switching, the problem can be so pronounced in the triode mode thats almost or is, unuseable without more filtering. Its also somewhat related to something called "intermodulation distortion" which occurs in all tube driven amplifiers being pushed hard at higher volumes, but is not nearly as noticeable as the out of tune ghost notes created by an underfiltered power supply (also more evdident when the amp is being pushed toward the max end of its output.)Ī poorly designed bias circuit can be an ingredient in the ghosting problem mix also, for the same reason (being underfiltered and allowing ripple in the supply to pass.) There are also proponents of bad grounding and lead dress, the way wires are routed and components are situated, adding to the problem with an underfiltered power supply. If youre in Europe it would be a 100hz freq since the standard is 50hz in the supply.
#Ghostnote serial number full
Ghost notes caused by inadequate power supply filtering usually have a freq at around 120hz modulating the signal (60hz ripple in the supply supply X 2 based on full wave rectification = 120hz) and creating the ghosting. When its bad and difficult to live with, its usually appears to be the most exaggerated on the D, G and B string above the 10th/ 12 fret, tho it can crop up about anywhere. Most of the time the problem can be partially or fully remedied by increasing the filtering in the power supply. and thats the type of ghost notes amp builders deal with and use the phrase in reference to. and in certain amp designs they can be a real pain the butt and in others more tolerable.what AdmiralB is saying about the Dr Z Rt66 amp speaks to the ghost note thats usually caused by an underfiltered power supply. Ghost notes ride shotgun "on top" of the guitar note and are'nt usually in tune harmonically with the note being played, tho some people are more inclined to say a ghost note "follows" shortly behind the desired note. I havent come across the term 57tele refers to, but it sounds like another use of the term (to add to the confusion.) "Madsman is correct about "ghost note" re: guitar tablature and as billyguitar said, cone cry from a speaker is a different animal, tho they often get mistaken for the other in the use of the general term "ghost notes".
and these "ghost notes" are always there. I've done all the basic troubleshooting stuff, retubed, biased, good short cord, straight in amp, no effects loop, different cab, etc. The pitch of the ghost note is around 120Hz, or a "B" note. I only hear it during the played note, but in the background. It's like the ground hum we're all used to, but unlike ground hum, it's not a constant in the background. It's most prevalent when single notes are played on the G, B and E strings around the 12th fret. I only hear it at high volume (channel and master volumes both at noon and louder) and only on the high gain channels.
I haven't found much out there on "Marshall ghost notes," but everything I find describes what I hear. It's not microphonics and it's not ground hum. I've had the amp for a year and I'm trying to determine if this is a new issue, or if I'm only noticing it now and my brain has become fixated on it.
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