Best I could do short of measuring yours:
https://www.audioheritage.org/vbull...-D-140-F-8-ohm&p=391256&viewfull=1#post391256
https://www.audioheritage.org/vbull...-D-140-F-8-ohm&p=391256&viewfull=1#post391256
In the absence of any ( newly acquired ) TS parameters for the D140F, I feel it's best to use the specs belonging to the 2205a ( the Pro successor to the D140F ) .