Tested out OK and went to full volume. A lot stronger reverb now. No oscillation, but I do get some crackling at full volume. The B+ voltage is higher for this than the original, so I might try to lower the B+ and see how it does. I plan on putting it on the variac and dropping the voltage so that the B+ is closer to the original and see how it does with that. Might switch back to the original tubes I bought for it also and see what difference that makes. It still needs a few trim pieces around the front face, a handle and maybe a grill in the back to protect the tubes, but it is much closer now. First time wrestling with grill cloth and I did not do a very good job. It is a little "pillowey" but I might not even try to tighten it up. The master volume works, but I don't know why I would ever use it on this amp. Easy and fun test, but I would definitely not add the master. It will stay bypassed with this one. The tremolo intensity works and is useful. The bypass switch is nice because the intensity takes a step down when the intensity pot switch is engaged. The intensity works to dial in a subtle level of tremolo.