2. amps-preamps
  3. 127980-84541

Preamp popping!

Salutations! 

I have a problem and was hoping to use our collective experience to solve it..

My preamp (dared mc-7p) produces a VERY loud pop through the speakers approximately 10-30 seconds after I power it up. I'm now concerned about blowing a tweeter. I can even see the 12" woofers move.

Obviously I can just turn the dared on first, then turn the amp on after a minute or so. But that's just hiding the problem. I'd like to solve it..

Ideas? I've tried nothing yet. My first inking is to try replacing tubes.. Good idea? If so, shall I start with the power or signal tubes? Again, my inkling is to start with power.

Assuming that doesn't work.. What else could it be? Some kind of capacitor gone bad?
128x128toddverrone

Showing 3 responses by escritorjuan

escritorjuan's avatar
escritorjuan
120 posts
 
I guess the sequencing depends on the equipment you have.  When I was a mobile DJ, I was told to "always, always, always" turn the amp on first before anything else and, when I'm powering down, turn it off last.  

But, with my LampizatOr Lite 7 DAC, it's the amp first, then the DAC for the same stated reason -- powering it up with the amp turned on can create a possibly damaging popping noise.  

My guess is that your preamp would fall into the similar sequence as my DAC.
escritorjuan's avatar
escritorjuan
120 posts
 

rodman99999
2,875 posts
01-19-2017 2:23pm
@escritorjuan - Don’t know who gave you that advice(amp on first/off last), BUT- Don’t ever take any advice from them again!

---------

I was borrowing my mentors mobile DJ rig and talking on the phone with him as I powered up his amp (the mixer/preamp and dual CD player were already on). A loud POP burst over the speakers. Needless to say, he was not happy! That’s when he gave me his advice.

Now, this was a powerful pro Crown amp. With that gear (and my DJ gear, with its 550 watt Crown PB-3 amp), this was the correct approach.




escritorjuan's avatar
escritorjuan
120 posts
 
In my case, the advise to turn on the amp on first and off last came from a mobile DJ in regards to his pro audio gear.  I was working for him at the time and had turned on his Crown amp last, creating a big "POP"!  He was not happy. 

With my LampizatOr Lite 7 DAC (which acts like a preamp in my system, as I use a passive preamp), I was advised to turn it on first, and then the amp, etc.  

Cheers,



Juan 
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