I thought I would swap out the original Gibbs tank in my Reverberocket 2 with a MOD. This would save wear and tear on my vintage tank. After installing the new tank today, I was surprised how weak the new tank was. At full reverb, it put out about the same amout as the Gibbs at 2. The resistance through both ends is correct. All hardware inside is in order. I don't know if I can send it back as it is working a little. I was careful to order the correct tank for the Reverberocket (4FB3D1B). Has anyone else had a problem with weak MOD tanks?