denon au-320 is very nice, 2 inputs, 3 ohm or 40 ohm gain/loading options, and PASS
https://www.ebay.com/itm/DENON-AU-320-step-up-transformer-mc-moving-coil-cartridges-junk-products-phono/383631324085?hash=item59523573b5:g:f6QAAOSwhtNecvwE
this one, with transformers many people respect, including Bill, has 4 different values set by switch combinations, only 1 input, no PASS for MM (it has only 1 input, so not needed).
https://www.ebay.com/itm/Moving-Coil-Phono-Step-Up-Transformer-Cinemag-3440AH-4-Ratios-1-9-1-36-MC-SUT/124263990235?hash=item1ceeb603db:g:pwAAAOSwdehfBJnw
the EAR MC4, used, 4 variations, via 4 separate sets of inputs, 3/6/12/40 ohms inputs, no PASS, only 1 input, compared to the Fidelity Research it seems poorly thought out, clumsy, were switches thought horrible things?
https://www.willhaben.at/iad/kaufen-und-verkaufen/d/ear-mc4-step-up-transformer-390620595/
a few Fidelity Research FRT-4 are out there
https://www.hifishark.com/search?q=frt-4
https://www.ebay.com/itm/DENON-AU-320-step-up-transformer-mc-moving-coil-cartridges-junk-products-phono/383631324085?hash=item59523573b5:g:f6QAAOSwhtNecvwE
this one, with transformers many people respect, including Bill, has 4 different values set by switch combinations, only 1 input, no PASS for MM (it has only 1 input, so not needed).
https://www.ebay.com/itm/Moving-Coil-Phono-Step-Up-Transformer-Cinemag-3440AH-4-Ratios-1-9-1-36-MC-SUT/124263990235?hash=item1ceeb603db:g:pwAAAOSwdehfBJnw
the EAR MC4, used, 4 variations, via 4 separate sets of inputs, 3/6/12/40 ohms inputs, no PASS, only 1 input, compared to the Fidelity Research it seems poorly thought out, clumsy, were switches thought horrible things?
https://www.willhaben.at/iad/kaufen-und-verkaufen/d/ear-mc4-step-up-transformer-390620595/
a few Fidelity Research FRT-4 are out there
https://www.hifishark.com/search?q=frt-4