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gareth magennis gareth magennis is offline
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Default Pultec EQP clone problem

On Wednesday, 3 February 2021 at 23:09:36 UTC, gareth magennis wrote:
On Wednesday, 3 February 2021 at 22:36:33 UTC, wrote:
gareth magennis wrote a pile of self serving drivel:

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My only concern now is that I return the unit to the customer with the proper mod in place,

** Which does next to nothing.
to find it really does have a motorboating problem I can't recreate on the bench,

** There is another way a piece of audio gear can be made to " motor boat " at a low frequency.

You mentioned there is a "patch bay" the unit plugs into. If somehow enough output signal gets back to the input, positive feedback results in low frequency oscillation - typically a sub sonic square wave at high level.

Bet your dopey customer has done that by missconnecting the patch bay.

Try it and see if what YOU get matches with their story.


..... Phil

Funny, that's what I just said, but in a different language.



I think we are actually on the same page here.