This is an excellent tube. I bought it as a replacement for the stock tube on a VHT Special 6 and the improvement was huge! I didn't want to make the amp dirtier or cleaner, just the sound to be bigger, fuller and the amp to retain the blackface-type cleans.
The description is right. It's a medium gain tube, the amp has a nice response across the volume pot, as it starts to overdrive just after 1 o clock. The bass is also very nice, a bit too pronounced for this amp, but in a live situation it really shines. The amp doesn't get lost in the mix, although is a small, low watt design.There are no rattles or other noises
I have changed 3 power tubes on this amp and the differences are marginal compare to the swap of the pre-amp tube (maybe the stock tube was really really bad)
This tube is highly recommended for a practice amp with only one pre-amp tube, it really gives life to the sound. Usually these amps have small speakers and lack bass (not the VHT though), so maybe this is a suitable solution.