I AM THE POSTER from where you found the background info on this amp!
That pic I took is how mine still looks today as was taken a few months ago but as I said in my blurb, I use the cabinet as an external 1x12 (now loaded with either a Celestion V30 or an Eminence Cannabis Rex) for other amps I have. Currently is in use with a Fender Super Champ XD. I have though used the head as an FX unit simply by stereo outing the signal to it (and the cab) for a full-on Tremolo and spacious Reverb and run the other side of the stereo signal dry (usually from a Cornford Roadhouse or a Pignose G40V valve amp which have no onboard reverb etc). This works well believe it or not!
I also think that the Guyatone brand of amps were made by same company as when you look at detailed pics pics, you will see same parts utilised and even the same Mitsubishi speakers. The Guyatone copies of Fender Silver Face Reverb amps were astonishingly good and quite sort after. Also it seemed to me that this Audition was losely styled on a Fender Black Face Bassman/Bandmaster stack of the 60's the Band Master had Tremolo also.
My amp cost £30 in 1972 new. I saved up paper round money, and birthday money. I had bought my first guitar many months earlier (Avon SG copy) and was so desperate to play it plugged in to something. Back then, amps were not cheap or plentiful and £30 was a fair amount to pay. I nearly sold it once to a Pro musician who wanted a practice amp but he only offered £25 and I wanted £35 ! So it stayed. Glad of it to, as is nice now to have a piece of music folklore to call my own... Oh and the inputs are stagged ie, the RHS is higher gain going to lower on LHS and will take 3 guitars input all at once - which is why I was popular at school!