> approximate 'close enough'.

Thanks and argh. I ass-umed 6-inch deck boards, calipered my deck, fotoshoped your image, and got numbers. When I went to post I saw your post and I am clearly very wrong. But maybe the ratios are valid and some help.

> measure the diameter of the base

The boards may be '6 inch' nominal decking, which ships wet and oversize, to give at least 5.5" when dry. Here in a damp autumn my by-6 deckboards caliper as 5.6", his look dryer. Taking 5.5" nominal we can scale-out the along-board skirt dimension as 2.94" which is probably a neat 3". Knowing the skirt is round, we can get transverse sizes. We can't get a height without knowing the angle of photography, but I took a guess based on the shadows of the board gaps.

skirt: 3"
stalk: 1.4-1.5"
top: 2.45"
height: roughly 1.9"
skirt height: rough 0.19"
pointer height above skirt: rough 0.29"
pointer width: 0.28"
width of groove on top: 0.15"
knurling: 18 per inch
bevel on top edge: 0.065"

So, the circuit is correct.
I just wanted to make sure it is ok.

It is correct in the sense that it will make some sound, but you don't need the inductor, the 330pF cap is largely enough to ensure stability.
I guess this LR network was intende to decouple capacitive loads, which is not necessary anymore since you have a xfmr.
I would ditch the inductor and the 47r, increase the output cap, since it sees very small offset voltage, you could use a 6V rated cap and increase it to 1000uF.
I would also implement two paths for negative feedback, one as it is but increasing R146 to 10k and adding a 10k from the other side of C74; that would be in order to tame the VLF hump due to the resonance of the output cap with the primary of the xfmr.

The trick is to not play while changing the speaker hook up.  Having a mute input with millisecond delay before the speaker switch, can force that issue.

Even without signal, a tube amp can blow up when disconnected from the load, contrary to solid-state amps.
In most cases, it would withstand a momentary disconnection, such as the time it takes a switch or relay to changeover.

Switching speakers while the amps are cranked and delivering signal       Flash bang wallop:-[ 
 a re-think or re-jig of what your trying to  achieve  might be the best approach. 

Thanks for clarifying those points Abbey,   

Hmmm....now I'll have to find them.....took those pictures years ago......

Okay no worries. I know how that is.