Orban 111B Parasound Dual Reverb Repair

[@MrElectrowhiz]

I was watching a video last week and there was a mentioned of the 78xx and 79xx series regulators are known to oscillate and i took note of that. I am working on a Kustom mixer power amplifier and it had an audible motorboating sound. I connected the scope to the regulator chips and found about 425k noise from the 7915. also the voltage never went above 12 volts and fell rapidly down to about 9 volts. Replaced with new part and the noise is gone. So you are the second person to say something about it in a weeks time. I never thought that could happen, but it is true now. Thank you for this video.

[@AERVBlog]

Your welcome. Don't forget the.01uf across the electrolytic for the really high oscillations. Although those are much less common. Thanks for watching.

[@sw6188]

Somewhere on KZbin if memory serves me correctly there is an amplifier made using linear regulators. They can be wired in such a fashion that they operate as amplifiers. That given, it is no surprise that they will oscillate if not padded down with the correct capacitance in the appropriate places. I have also seen 78 series regulators fail and do all sorts of weird things so it's not uncommon to find a faulty one although in the main they are pretty reliable.

[@Rob4drums]

hi, i have one of these.. the left side passes signal but only dry. idk where to send it for repair. can i send to you for repair? thanks

[@AERVBlog]

Please contact me at [e-mail]

[@rosalynachille1915]

*Promo SM*

[@AERVBlog]

I dont understand.