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
 
Sorry, the 6v6 that died is on my preamp.

I have a class D power amp.. A Crown xls1500. 

lowrider57's avatar
lowrider57
5,417 posts
 
https://www.google.com/#newwindow=1&q=preamp+power+up+pop+

@toddverrone, this is a common occurrence between preamp and amp. BTW, using  the MUTE button does prevent this.

randy-11
1,913 posts
 
maybe some caps are going bad

or relays
toddverrone's avatar
toddverrone OP
840 posts
 
@lowrider57 this pop was louder than the normal, quiet pop. This was super loud and did not sound 'healthy'. It turned out to be one of the power tubes on my preamp. When I turned the pre on, I actually saw a huge arc from the top of the tube to the bottom..!
lowrider57's avatar
lowrider57
5,417 posts
 
this pop was louder than the normal, quiet pop. This was super loud and did not sound 'healthy'. It turned out to be one of the power tubes on my preamp. When I turned the pre on, I actually saw a huge arc from the top of the tube to the bottom..!

OK, got it.  When tube was replaced did it return to normal operation?







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