Ampeg SVT450H issue - gets quiet and glowing speakers
I am having some issues with my Ampeg SVT450H amp. It seems to be playing fine with good volume and sound like its supposed to..
However, after letting it sit for about 30 minutes I plugged everything back in and it seemed to work perfect again, but another 15-20 minutes later...same thing happens.
Maybe its something that is malfunctioning after warming up?
I am planning on taking it in to get checked out very soon. I am hoping its nothing major as it tends to sound fine in the beginning and only malfunctioning after playing after some time.
Any suggestions on what it may be?
Is this a common issue with this amp?
Any input is appreciated.
That looks like either DC offset (very bad thing for your speakers) or ultrasonic self oscillation. I strongly recommend NOT trying to use it again until repaired.
It could be a relatively cheap fix right now unless you push your luck and make it an expensive one.
Thanks for your quick response B-String.
I appreciate your input! I will mention your ideas to the repair tech.
I will be taking it in for repair ASAP.
I'll take your advice and not attempt to use it again until its repaired.
Any idea of $ ballpark if it were one of the diagnosis you mention?
Just trying to get an idea at what Im looking at here.
Depends on how fast it can be located. I'm leaning heavy on the self (parasitic) oscillation fault. This would also explain the amp still being somewhat functional but the oscillation is beyond human hearing and the speakers range. The lamps don't have a frequency response so they are glowing. The more amp power gets used up for the oscillation the less is available to produce the sound you want.
It could be as simple as a failed solder joint, $0.25 cap, $0.10 resistor, $1.00 IC. How long it takes to find it is the unknown and what the labor rate is at the shop. It is not a "normal" failure IME, but does happen on occasions (not specific to just this amp).
Good luck and report back so we know how you come out.
Will do thanks!
I took my amp to a local music shop, but didnt get to talk directly to the repair tech as it was picked up through a third party guy.
Being this is the info I got from the guy at the music shop and he didnt seem to really take very good notes as to what the issue was, but I was told that there was a bare wire exposed or detached which was causing internal feedback within the amp. All in all, they said it would be a $50 dollar fix. (WooHoo!)
He said the repair guy was having issues duplicating the issue as it was intermittent.
So lets hope that this fixes the problem!
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