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I have replaced op-amps on my 1642VLZ3 three times. The first time was two, the second was one, and this week was five.

[JackA]

On Wednesday, February 1, 2017 at 8:27:00 PM UTC-5, wrote:
I have replaced op-amps on my 1642VLZ3 three times. The first time was two, the second was one, and this week was five.

Think Op-Amps are like Capacitors, replace frequently!

Jack

[Mike Rivers[_2_]]

On 2/1/2017 8:32 PM, JackA wrote:
Think Op-Amps are like Capacitors, replace frequently!

Op amps almost never go bad by themselves. Something has to make them
fail. It could be a defective power supply regulator, or maybe a shorted
capacitor.

--

For a good time, call http://mikeriversaudio.wordpress.com

[Phil Allison[_4_]]

Mike Rivers wrote:


Op amps almost never go bad by themselves. Something has to make them
fail. It could be a defective power supply regulator, or maybe a shorted
capacitor.



** Or like one Mackie 1624VLZ that came to me for repair with several dozen failed op-amps.

The user had connected the speaker output of a Marshall amp to one of the mic inputs - one that used diodes connected to each rail for protection.

The output from the Marshall was rectified by the diodes, driving the internal DC rails way above the usual +/- 16V.

The desk was a write off.

I saved the PSU and all the knobs.


..... Phil

[Mike Rivers[_2_]]

On 2/1/2017 8:26 PM, wrote:
I have replaced op-amps on my 1642VLZ3 three times. The first time
was two, the second was one, and this week was five.

Have you checked the power supply to see if it's running wild?

--

For a good time, call http://mikeriversaudio.wordpress.com

[Scott Dorsey]

wrote:
I have replaced op-amps on my 1642VLZ3 three times. The first time was two, the second was one, and this week was five.

Why did you do this and what makes you think they were bad?
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."