Nav 401L Test Set problem

Sorry if this is the wrong group (probably!)
Please advise a more suitable group

I've got this test set, on the back is a mains socket, all the manuals I've
seen in the uk, show a uk socket. This one has six pins, (its the 110volt
version). It's not clear to me which pins are for which.


Top

Nav Sig
Tone O O Gen
Out Demod
_.-""""-._
.' `.
/ \ Pwr
| __ __ __ | O Mon
| 1 2 3 | Demod
| __ __ __ |
\ 4 5 6 /
`._ _.'
`-....-'
^
It's these ones here, 6 is earthed, I think postive + is 5 and 1 (-)
is negative?
Hope this is clear, ascii art is not my strong point!