Indeed BAT oilers look identical to Jensen. My assertion as to their identity follows several posters and webzine reviewers who have stated that BAT PIOs are specials developed by Jensen.
Of the Mundorfs I have tried only Silver/Gold. They have handily surpassed REL RT and Hovland Musicap in my line & phono stages. But the most immediate & dramatic improvement was replacing BAT PIO with V-Cap TFTF. V-Cap TFTF was also a major improvement over REL teflon in my LS. In my system the phono passes signal through two Mundorf Silver/Gold and one V-Cap TFTF coupling caps. The CDP passes only through two V-Cap TFTF. These sources sound damned close, which I believe testifies to the quality of Mundorf.
Of the Mundorfs I have tried only Silver/Gold. They have handily surpassed REL RT and Hovland Musicap in my line & phono stages. But the most immediate & dramatic improvement was replacing BAT PIO with V-Cap TFTF. V-Cap TFTF was also a major improvement over REL teflon in my LS. In my system the phono passes signal through two Mundorf Silver/Gold and one V-Cap TFTF coupling caps. The CDP passes only through two V-Cap TFTF. These sources sound damned close, which I believe testifies to the quality of Mundorf.