Bass Thumper, I'm sorry I misread your amplifier; your amplifier is a Fender Bronco and you are using the Fender Rumble amplifier preset.
No problem at all Jim, Thanks for jumping in to help move this along; there is much I need to learn on this subject. And with British, Australian and American English at play (and btw, let's be honest here, the Brits have the correct mother tounge even if they do like warm beer

) combined with as many time zones and different levels of experience, mis-communication is bound to happen. It's the smart fellow/gal that can detect when miscommunication happens. Also, this is my first exposure to the term "valve" in this context.
You're right. My amp is the 40W Fender Bronco, no longer in production

and I have several bass model presets available on this amp that can be further shaped by the onboard effects. Right now I'm favoring the Rumble preset, but that could easily change. Details on these settings were written above.