How do I keep my cats off my amplifier?

My cat used to sit on my Proceed AVP for months upon months. I kept gently ushering her off, but she'd always return due to the warmth. Fast forward one year and I had to send it in for service. They called me and said: "What the #@*! did you do to this processor"?
It had one inch of cat hair piled up and in the circuit board. The hair went through the drilled vents in the top.
I also have a German Shepherd who still gets the cat scurrying to higher ground, so that is not a solution. That air bazooka is clearly the way to go. And to all the people with bats and rusty nails, would that be a suggestion for raising children? One should never harm animals, even if you don't like them.

Forgot to mention; serial killers start with torturing cats at a young age. I suppose you can call it a Gateway torture form. Many people have the urge to inflict the pain on the cat, serial killers give in to the urge and act on the impulse. Quite disturbing to see so many suggestions of poison, guns, bags with rocks, bats with rusty nails, etc... Live and let live guys.

I completely OVERDROVE my point. I do see the angle of humor. I was just surprised at how MUCH of it was here. It is like the cat killer convention. I am not much of a cat person even though I have a cat I took in 10 years ago since it was abandoned. It is just freaky how cats instill a desire in so many humans to inflict harm on them. I was merely cautioning people to not go overboard with their hatred of cats.
I am NOT suggesting Socratic deductive reasoning: Serial Killers kill cats, people here kill cats, therefore people here are serial killers. NO. Just pointing out that it is not the healthiest thing to have a LONG forum thread unfold about ways to kill or dispose of cats.
I appreciate your considerate response. I am not offended, I just typed my immediate thoughts. Did not mean to ruin the party, just meant to rein it in a bit.
Sometimes group collective reinforcement instills acceptance of certain behavior inadvertantly, then maybe one day someone winds up in a situation where they have a BB gun and see a neighbours cat in THEIR yard and subconsciously remove the hesitation to refrain from the impulse to shoot it with the pellet gun. I still have the image of the German Shepherd with the crossbow arrow in its snout.
Anyway, I am not offended. I have had to deal with the EXACT same situation with my amps and preamps and I'm sure cat lovers would have been shocked with some solutions I pondered on in my head.
My point was a little harsh, so also, take no offense guys.