- Meyer Sound 833 problem - 4 Updates
| "ohg...@gmail.com" <ohger1s@gmail.com>: Sep 30 10:31AM -0700 On Friday, September 30, 2022 at 11:12:59 AM UTC-4, JC wrote: > not familiar with the amp and not an audio guy but: > 15Khz sounds like switching supply noise? Bad caps on power rails? > JC I thought of and then dismissed that assuming both channels shared a common supply, but I guess there could indeed be a separate converter for each channel. One thing I've found consistent in consumer electronics is that that lazy electros generally respond to heat and cold. Warm it up with a heat gun. Noise gone? Good chance an electro bypass is the cause. |
| Trevor Wilson <trevor@rageaudio.com.au>: Oct 01 03:11PM +1000 On 1/10/2022 1:12 am, JC wrote: > not familiar with the amp and not an audio guy but: > 15Khz sounds like switching supply noise? Bad caps on power rails? > JC **Not power supply noise. The power supply is as clean as a whistle. All electros have been replaced with high quality (Panasonic and Nichicon) components. The unit is pure analogue. NO digital stuff to be seen. There are 25 dual OP amps (5532), a handful of bipolar transistors, 2 X dual gate MOSFETs, four Vactrol opto-isolators and here's the big one: 27 preset pots. Every single one has been moved from factory settings by a previous tech. Without access to factory service data, I have no chance of restoring this thing to anything resembling normal operation. I have been able to stabilise one channel (though I still have a low level 2MHz oscillation to deal with). I was able to measure the frequency response curve and fell confident that I can duplicate the curve using a a 32 band, digital parametric EQ. I won't have the ability to use the speaker feedback section, but that should be a concern, give that the system is designed for sound reinforcement use, but will be used in a domestic application. The speaker feedback system is designed to protect the HF drivers under very high power operation. MY solution should work well and will cost my client much less cash. -- This email has been checked for viruses by Avast antivirus software. www.avast.com |
| Trevor Wilson <trevor@rageaudio.com.au>: Oct 01 06:29PM +1000 On 1/10/2022 3:11 pm, Trevor Wilson wrote: "... but that should be a concern,...." Should read: "...but that should NOT be a concern,...." -- This email has been checked for viruses by Avast antivirus software. www.avast.com |
| Phil Allison <pallison49@gmail.com>: Oct 01 02:24AM -0700 Trevor Wilson wrote: =================== > I won't have the ability > to use the speaker feedback section, but that should be a concern, give > that the system is designed for sound reinforcement use, ** Errr - no it ain't. https://www.manualslib.com/manual/915648/Meyer-Sound-833.html?page=6#manual And this section is dead funny for all the wrong reasons. https://www.manualslib.com/manual/915648/Meyer-Sound-833.html?page=9#manual ...... Phil |
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