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Similar issue, in my one and only amp build, I bought a Hammond 291BX PT for the thing. Mounted it on the chassis, and wired everything up, no tubes, I powered it up and it did hum a lot louder than I thought it should. Double, triple checked all of the connections, etc. Ended up talking to Hammond Tech support in NY, they said pull it out and send it to use, they'd swap it with another one. When it got there the tech replied "Yes, I CAN HEAR what you are talking about, it does hum". it took a couple of weeks to get the replacement, the tester guy was out on vaca. They said they wanted to re-test the one they pull out of stock to make sure it didn't hum. The new one ... a little quieter, but it does hum as well. Noticeable with the amp on, and if Im not playing. If someone was looking to get that nice 60 or 120 tone onto a recording, this would be the amp for them.
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