Done a little research and the reverb driver on the deluxe reverbs is 25k/8ohms so I'd be somewhat off using an 8k/10k small output unless it had a 4 ohm secondary otherwise, and I've lots of those little radio output trannies I could take off a casing and unwind, after seeing what the impedance ratios were, what is hopefully the high current winding on the outer then calculate what might be slightly less than half the turns and rewind it to that...
Did the calcs and if I was to use a regular power transformer. we're on 230-240VAC here, It'd be a 4VAC out... bugger, a 6V out equates to a 12K input impedance.
But then again I'm somewhat jumping the gun as it might pay to have a look at my reverb tanks and see what gives there.
Hammond type 4 (bit rusty and supposedly quite nice as the slight rustiness and stretched springs of old units can't be replicated by accutronics... internet folklore?)
input 283mH 173ohms
output 409mH 176ohms
Italian organ pan
input 66mH 1ohm
output 418mH 168ohms