Hello Peter,
I am sorry for my later answer .
Please read about differences in tubes here: we already wrote about it in this thread:
viewtopic.php?f=11&t=4#p8The truth is that with EF12 tube we can get the closest character of sound to U47 with VF47.
Difference between our F7 and Thiersch M7:
We make F7 in modification with polyester or mylar diaphragm, Mr. Thiersch has modification also with PVC skin.
There shouldn´t be any difference between our polyester or mylar and his polyester or mylar.
But regarding to his PVC M7 capsules, are people who say - as the PVC material used for capsule skinning is more tenuous, not so plasticized as polyester film or mylar film, so this PVC is able to catch more detailed, small nuances of the sound mainly on higher frequencies. Output sensitivity is also higher about 1,5 dB than polycarbonat or mylar.
Disadvantage of the PVC is its shorter lifetime, there is more quick aging than at polyester or mylar.
The brightest sound has FLEA 47 with UF14 in comparison to EF14 or EF12, then EF14 in comparison to EF12.
FLEA cable wouldn´t match your original microphone set, the connector in microphone side will match your original mic,
but on the side to the power supply, we use binder connectors instead of original old tuchel connectors.
Of course, if you would need, we can make the cable that will match your original set.
With kind wishes,
Ivan