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Amp gain and crossover stopped working!!

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Old Sep 5, 2006 | 12:19 PM
  #1  
technine's Avatar
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From: aroundtheworld, inaday, usa
Default Amp gain and crossover stopped working!!

I have a bazooka ela 500.1 amp and I accidentally hooked the rca plugs to the output of the amp, but it sound was coming out so I thought I had it hooked to the input.

Well I had it like this for a day or so and then I decided to adjust the crossover on the amp along with the gain and nothing worked. I checked all wiring and it was good. I then checked the RCAs finally and noticed it was plugged into the output instead of input! So I switched them with the same out come: sound, but no adjustability with the gain or crossover.

What has happened to my amp?
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Old Sep 6, 2006 | 07:26 AM
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fcm
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Default Re: Amp gain and crossover stopped working!! (technine)

Well it definitely sounds like you have damaged something in the amp, maybe diodes from feeding a signal backwards into the amp, although I am not sure, why that would "blow" anything
Sorry I could find little info on the ELA500.1 at their site, does the amp have a x-over/gain bypass switch maybe?
Why not just take it back where you got it, don't mention you plugged it in backwards, they should cover it under warranty. 94
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Old Sep 6, 2006 | 08:12 AM
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Default Re: Amp gain and crossover stopped working!! (fcm)

They shouldn't be using diodes on the input or output that would convert the AC signal to DC.

I don't know this amplifier, so I cant tell you what the circuit looks like.

Its probably a couple of opamps. The output should just be tapping off the input. So I doubt you damaged the "input". Although the output and input opamp may share the same IC so you may have damage the IC which is why your input no longer works correctly.

Your looking at $75-100 repair.

If you decide you dont want to repair it and want to sell it let me know.
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Old Sep 7, 2006 | 03:20 PM
  #4  
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Default Re: Amp gain and crossover stopped working!! (fcm)

I got it off ebay, I'll check their warranty. It was used so I don't think I will have a chance to send it back.
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Old Sep 7, 2006 | 03:22 PM
  #5  
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Default Re: Amp gain and crossover stopped working!! (nsxxtreme)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxxtreme &raquo;</TD></TR><TR><TD CLASS="quote">They shouldn't be using diodes on the input or output that would convert the AC signal to DC.

I don't know this amplifier, so I cant tell you what the circuit looks like.

Its probably a couple of opamps. The output should just be tapping off the input. So I doubt you damaged the "input". Although the output and input opamp may share the same IC so you may have damage the IC which is why your input no longer works correctly.

Your looking at $75-100 repair.

If you decide you dont want to repair it and want to sell it let me know.</TD></TR></TABLE>

I might ask a family friend if he can check it out, I think there was 2 opamps (or at least I think they were, look like chips with 6 prongs 3 on each side) that had burnt prongs or at least brown ones so I'll check that. My family friend use to work for motorola making some of their chips or whatever lol.
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