Question about Peavey AMPLIFIER, 1000 WPC, DDT, 8/4/2 OHMS => Model PV2000 Car Audio Amplifier
I have a 100 watt per-side stereo combo keyboard amp. Output stage is Class D switching audio.
SFX-100 from Groove Tubes manufacturer. It uses cross-fire phased stereo imaging, dipole speaker arrangement and electronics phasing, but don't think that part of circuit is part of the problem.
The crossfire speaker always emits a 120 Hz buzz. Not excessively loud, but not present in the forward speaker. From what I understand, properly working units don't exhibit this.
The cross-fire channel distorts at all but the most quiet of input signals, the forward channel is nice and clear. The distortion sound is ... somewhat ''papery,'' it's not the clipping type distortion, more reminiscent of a very coldly biased class AB amp.
Do these symptoms ring any bells for a Class D amp? Anything I should start right away with? The manufacturer has turned ops over to Fender Musical Instruments, who are currently flummoxed as to handling service calls, requests for schematics, etc.
Have o-scope, meters, iron, etc., and pretty decent analog debug and fix skills.
THANK YOU FOR YOUR HELP!
- Carl Berger
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Posted on Jan 02, 2017
SOURCE: Buzzing bass Amp combo
The problem you have mentioned is a common one with old sets, but it also occurs in new ones also, though not frequent. You can fix this just by changing the electrolytic filter capacitors in the power supply and sub filters on the amp PCB. The new capacitors should be of the same or higher voltage rating and same capacity rating as of the existing ones. And as it is such an old one, it is better to change all the electrolytic capacitors to avoid any further problems.
Posted on Dec 19, 2007
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