Value for a 230v Dual Rectifier Rackmount

[octatonic]

Hi ppl,

I don't post here much but hoping someone can give me an idea of the value of my Dual Recto Rackmount.
Mine is Rev G.
Serial Number is R-011XXX.
All stock except the series mod has been done.
Has EL34's in it at the moment.

Many thanks.