Managed to eliminate ghost notes with PPIMV

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aside
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Joined: Wed Apr 11, 2007 10:07 am

Managed to eliminate ghost notes with PPIMV

Post by aside » Wed Feb 02, 2011 7:36 am

Not sure if this has been posted before, but I just installed a fixed PPIMV in two of my amps that both suffered ghosting qutie badly. Thought it might be useful for those who have had trouble in this regard.

I basically replaced the 220k resistors with 150k/68k pairs and the ghost notes are completely gone. The amp is still plenty loud and hence my attenuator doesn't have to work as hard for sane volumes. To my ear, a PPMIV and an attenuator works better than just one method. Hang on, getting sidetracked....of your amp suffers ghosting and it annoys you, give the above a try! :rock:

sonofmickel
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Re: Managed to eliminate ghost notes with PPIMV

Post by sonofmickel » Sun Nov 01, 2015 10:08 pm

Reviving Zombie thread.

What does the OP mean by 150k and 68k?
Are these in series and meant to swap out the single 220k's for the 150k/68k?

My 1987 build still has unbelievable ghost notes. All caps are good to go. It is not the speaker.
Ghost notes start at 3 oclock.

sonofmickel
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Re: Managed to eliminate ghost notes with PPIMV

Post by sonofmickel » Fri Nov 06, 2015 7:16 pm

is the OP talking about the replacing the 220K Bias resistors?

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