The KO threezero Optimus (MC-003) CAN do the combination with jetfire! Some parts are ever so slightly wrong or need to be fixed in some way but it is very possible :
MC Transformer | ortofon - オルトフォンジャパン
Takara Transformers Micron Legend Hot Rod S (Super Mode) MC 13 | Mandarake Online Shop
New MC step-up transformers! - Lundahl Transformers
Moving coil input - Lundahl Transformers
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Lundahl MC Phono Step-Up Transformer Kit - DIY Tips & First Impressions - YouTube