Hi all!
Yesterday I got around to rebuilding my 1971 Oliver B200 head ( 2 channel duel 7027 amp) and once I got it on my scope and drove it with a 1K tone it produced his cap at the top and both of the wave just before clipping, about 55 watts.
Anyone ever see this occurrence before?
I was just about to go back up stream to see if it was happening in the PI section when my darn scope went south, so today I am fixing that!
Thanks in advance!
Strange output wave form
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Stevem
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Strange output wave form
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Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Re: Strange output wave form
That may be indicative of instability, parasitic oscillation, ie oscillation that is parasitic to a regular signal, as it requires particular, signal dependant conditions, to manifest.
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Re: Strange output wave form
I had an amp that did something very similar right at the point of clipping:Stevem wrote: ↑Sun Apr 12, 2020 10:50 am ...
once I got it on my scope and drove it with a 1K tone it produced his cap at the top and both of the wave just before clipping, about 55 watts.
Anyone ever see this occurrence before?
I was just about to go back up stream to see if it was happening in the PI section when my darn scope went south, so today I am fixing that!
https://ampgarage.com/forum/viewtopic.p ... 93#p336493
The fix for my amp was increasing the value of the fizz cap (cap between PI plates).
Mike