I just took my blues jr. Out of storage. After plugging it in it popped a power tube. It might have been handled rough in transit. I checked out electronics, everything looked pristine. I installed 2 gold lion power tubes. Let them heat up well and played. Clean sounds great but amp rattles at breakup. Especially on g string. This amp never was used much in past. Not even broken in. Any advice on where to start troubleshooting would be appreciated. Only rattles after 3 on master dial and 2 on volume. Fat switch makes it worse. Sounds like a blown speaker. but I tested it with another amp and its fine. I ordered a set of pre amp tubes. Hopping thats the problem. Thanks.