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
toddverrone's avatar
toddverrone OP
840 posts
 
@atmasphere thanks for the tip! Both tubes that went were new electro harmonix
atmasphere's avatar
atmasphere
11,640 posts
 
@toddverrone Thanks for confirming my suspicion! If I recall rightly the RCAs are the 6V6s to be looking for.
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 
toddverrone's avatar
toddverrone OP
840 posts
 
That's what I've mostly been doing lately: turn on pre, turn on amp, then the opposite for turn off: first the amps, then the pre.
toddverrone's avatar
toddverrone OP
840 posts
 
I still think it’s funny, reading this thread again, how much I was shouted at in the beginning about not following the right power on/off sequence. It goes to show you how we often form an opinion before we’ve heard all the facts. And I speak from experience.. lots of experience. ;-)
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