Supex SD-900 MKIV impedance loading


I need to set the impedance loading on a phono stage (Threshold FET10) for a Supex SD-900 MKIV cartridge but do not have the specs. Can anyone help with the manufacturer's recommendation or other guidance? Thanks.
gigue
If you send me your e-mail address I will scan and e-mail you the description out of the 1986 Buyers guide, this way you will have all the information you need.
Hi Dougdeacon
aye, the 25x DCR if you do NOT use an SUT :-)

Otherwise?
You may recall our little tête-à-tête, or was it Lewm that begged the wisdom of 2.5x in the case of an SUT involved?

I then had referred him to the Lyra spec. sheets that make a CLEAR differentiation between those two conditions.