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Ampeg B200R custom amp cabinet

M

minkis

Sep 8, 2000
25
0
www.escherbach.com
#1
So I've had an Ampeg B200R for over a year now and finally started to have the problem with the rattling. Tightening the chassis screws didn't really help out so I removed it and set it on a flat surface behind the amp and everything is now fine.

I know that it completely defeats the purpose of it being a combo amp, but I was wondering if anyone has had the idea to build a custom head cab to house the chassis separate from the cabinet? This would also require using a much longer speaker wire to plug the amp into the cabinet. Thoughts?
 
#4
I just put in a new JJ 12AU7 / ECC82 tube in mine, which sounds good, as the GT tube was going microphonic. I still like mine, I don't use it with a fiver.

I posted this before about my rattle cure:

1. Removed 3 screws on each side which hold the amp in and removed the (unplugged) amp. It's a tight fit and you have to be careful not to touch any electronics inside. Unplug the speaker cable.

2. Drilled 2 holes in the aluminum chasis where the large black heat sink is, on the outside of the amp. Mine was held on by 2 screws and nuts and could have been the rattle culprit. The heat sink has the holes pre drilled, but no screws. I used 2 screws, lockwashers and nuts.

3. I put a strip of 3/8" or 1/4" black foam insulation strip (self adhesive, you can get at a hardware store) along the amp chasis near the heat sink which runs the entire length of the amp. You can see that when the amp is installed, this long strip is underneath the amp and butts up against the cabinet, a definite spot that can rattle.

4. I pulled the grill by starting a screw in one corner of the grill and ran it in about a 1/2"
then using pliers, pulled the front grill off. Removed the speaker. Used Liquid Nails and ran it along all of the inside joints (disposable gloves worked great to smooth out the glue.) Used 1/8" self-adhesive foam insulation and installed it on the speaker baffle, so it would hit the speaker, and put the speaker back on. Make sure the wires don't lay on the speaker, put a loose knot in them to take up any slack if you have to. Also removed the horn and used the insulation under the horn. Replaced grill.

5. Installed amp and made sure the chrome screws which hold the amp in were tight.
 

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