Yes, what you described is the PA amp I use to power the talkbox. It's small, weighs about 10 lbs and easy to carry around if you're doing gigs.
Radio Shack sold the model I have for years (OPTIMUS MPA-50) but the current version of this PA amp has been re-designed and re-titled "Radio Shack 40w" item #32-2054. But PYRAMID has the same unit but added color to the front display (blue) and they call this model Pyramid PA205 and is the same as the Radio Shack 40w.
Just different name brands for the same pa amp.
@DJ MARK7:
I have 3 talkbox lesson video shorts (snippets) available that show my hand striking notes and you can hear what I'm playing... I made them to demonstrate how to play along with someone such as Stevie Wonder on the talkbox (which he is using in the snippet), the other 2 are of More Bounce and Superman. But I'm working on more of them but theses are merely little snippets made using Windows Movie Maker and a webcam.
And... you can get a talkbox from me at any time just let me know when and how you wanna pay for it and I'll get you one ASAP cause they are selling like hotcakes so you better get your grub on playal... hahaha