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CTs 1200 with pip usp3 card making popping, crackling noises. Video included. Please help

I'm having a weird problem with my Crown CTs 1200 that I just bought used from eBay. It was sold as a guaranteed working amp. Well it does work but for the first minute or so after turning it on it makes this popping crackling sound. As soon as I play a test tone the crackling goes away and the tone is nice and smooth. But after a couple minutes of having it on the noise mostly goes away but not completely. This problem happens even without anything hooked to the input of the amp . I plan on calling crown technical support Monday but just thought I'd check here first if someone thinks I got a bad amp. I really hope I don't have to send it back. Is this a common issue? Maybe the pip card is bad? Thanks

https://youtu.be/HmuvbWVC2Fc

Comments

  • nojoconojoco Posts: 23
    edited January 9

    Does it do the same thing with the PIP card removed? Is it coming from both channels?
    The CTS line of amplifiers are designed for 70/100 volt systems. The speakers you have connected (in your video), are those 70 volt capable speakers?

  • dustint209dustint209 Posts: 2
    edited January 9

    It is hooked up to a 4 ohm speaker. The manual shows wattage ratings for 70v, 100v, AND 2 ohm 4 ohm etc. And Ive seen other people use them in home theater systems. The amp pushes the speaker fine and sounds great when its cranked up. The popping sound is only when no signal is sent to the amp. I just removed the pip board and the pooping sound is gone. So i guess I have a bad card? I've seen a few on eBay that are "for parts or not working" so I assume they do go bad. Thanks for your help

    From the Crown CTs manual

    Direct constant-voltage
    (70V/140V) or low-impedance (2/4/8 ohm)
    operation. No switch required.

  • nojoconojoco Posts: 23

    Nice to see that amp can support ohm and voltage loads without switching. From what you described, it does sound like a bad PIP card. I'm sure a PIP card would be more affordable for a replacement than the entire amp. Good luck!

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