hopping about, see some vintage stuff, do these transformers age well?
Denon more modern look, dc in from separate power supply 100v, I'd need a 120/100 pre-transformer.
https://www.ebay.com/itm/DENON-HA-1000-Step-up-transformer-head-amplifier-Working-Properly-F-S-d530/254589438969?epid=1040361048&hash=item3b46b68bf9:g:xqgAAOSweYBesriC
Thorens, 12v, low 22db, high 32db, bypass
https://www.ebay.com/itm/THORENS-Step-up-Transformer-PPA990-NEW-c1091/324210004828?hash=item4b7c6c135c:g:UMcAAOSwYAVefCjm&autorefresh=true
sony 3, 40, pass and front on/off
https://www.ebay.com/itm/SONY-HA-55-MC-cartridge-head-amplifier-Step-Up-Transformer-import-Japan/174120794119?hash=item288a687807:g:rckAAOSw6l1d7pT5
UTC A-11 altec switchable, 16:1 or 32:1
https://www.ebay.com/itm/133457836840
fidelity research frt-3 10 or 30. 26db or 31db, pass
https://www.ebay.com/itm/Fidelity-Research-FRT-3-Step-Up-Transformer-MC-Phono-Cartridge-USED-JAPAN-fr-64/193131068733?hash=item2cf7823d3d:g:y0cAAOSw2YpdapVv
An OLD DOG, like me, 20:1, simply vintage
https://www.ebay.com/itm/Klangfilm-Siemens-T-42-2e-step-up-transformer/133312407153?hash=item1f0a09e671:g:XU0AAOSwiaVeKCWe
Sony in-line blocks HA T10, +26db
https://www.ebay.com/itm/SONY-HA-T10-Step-Up-Transformer-MC-Moving-Coil-Phono-Cartridge-USED-JAPAN-RARE/193131071248?hash=item2cf7824710:g:pYMAAOSwLNpblKR6
Denon HA-500 24db 32db pass
https://www.ebay.com/itm/DENON-HA-500-Step-up-transformer-head-amplifier-AC100V-Free-Shipping-d1030/264728266720?hash=item3da308c7e0:g:UVQAAOSwkZleuiRY
JVC 30 ohm
https://www.ebay.com/itm/JVC-Victor-MC-T100-MC-Step-Up-Transformer/264781535201?hash=item3da63597e1:g:OJAAAOSwy~Je~Ctp
Cinemag 4 ratios: 1:9, 1:12, 1:18 and 1:36 (l or l+r?) (no pass)
1:18 on AT-33PTG/2 would be 5.4mv; 145 ohms
https://www.ebay.com/itm/Moving-Coil-Phono-Step-Up-Transformer-Cinemag-3440AH-4-Ratios-1-9-1-36-MC-SUT/193558279772?hash=item2d10f8f65c:g:pwAAAOSwdehfBJnw
I'll Make My Own
https://www.ebay.com/itm/COIL-WINDING-EQUIPMENT-MODEL-W-S-N-1171-T-440393A-w-FOOT-SWITCH-COUNTER/133247476931?hash=item1f062b24c3:g:LOkAAOSwUHld1tb9
??? Why can't they make one like this ???
https://www.ebay.com/itm/STACO-Energy-3PN1010B-Variable-Auto-Transforer/173800804939?epid=15006512759&hash=item287755d24b:g:EawAAOSwrdlcaySU:sc:FedExHomeDelivery!07062!US!-1
Empty Box ready for your 9 pin transformers of choice
https://www.ebay.com/itm/Moving-Coil-Phono-Step-Up-box-for-RCA-MI-12399-Transformers-MC-SUT-Bogen-T155-HK/193511613150?hash=item2d0e30e2de:g:05gAAOSwcTZeqOW9
same for smaller diameter transformers
https://www.ebay.com/itm/Moving-Coil-Phono-Step-Up-box-for-Sansui-A-603-9-pin-plug-in-Transformers-MCSUT/124163160221?hash=item1ce8b3789d:g:Z2EAAOSwxTZdaaw9
.............................
Finally, Maestro's Remote Controlled Variable Transformer, from the Listening Position. Two required for Stereo
https://www.ebay.com/itm/Lutron-Remote-MA-RH-Maestro-Dual-Control-Dimmer-White-NEW/303506335792?epid=1300142038&hash=item46aa632830:g:kSkAAOSwnAJeX72R
................................
Tiring, but, I had fun seeing how various companies/designers solved things over the years
Denon more modern look, dc in from separate power supply 100v, I'd need a 120/100 pre-transformer.
https://www.ebay.com/itm/DENON-HA-1000-Step-up-transformer-head-amplifier-Working-Properly-F-S-d530/254589438969?epid=1040361048&hash=item3b46b68bf9:g:xqgAAOSweYBesriC
Thorens, 12v, low 22db, high 32db, bypass
https://www.ebay.com/itm/THORENS-Step-up-Transformer-PPA990-NEW-c1091/324210004828?hash=item4b7c6c135c:g:UMcAAOSwYAVefCjm&autorefresh=true
sony 3, 40, pass and front on/off
https://www.ebay.com/itm/SONY-HA-55-MC-cartridge-head-amplifier-Step-Up-Transformer-import-Japan/174120794119?hash=item288a687807:g:rckAAOSw6l1d7pT5
UTC A-11 altec switchable, 16:1 or 32:1
https://www.ebay.com/itm/133457836840
fidelity research frt-3 10 or 30. 26db or 31db, pass
https://www.ebay.com/itm/Fidelity-Research-FRT-3-Step-Up-Transformer-MC-Phono-Cartridge-USED-JAPAN-fr-64/193131068733?hash=item2cf7823d3d:g:y0cAAOSw2YpdapVv
An OLD DOG, like me, 20:1, simply vintage
https://www.ebay.com/itm/Klangfilm-Siemens-T-42-2e-step-up-transformer/133312407153?hash=item1f0a09e671:g:XU0AAOSwiaVeKCWe
Sony in-line blocks HA T10, +26db
https://www.ebay.com/itm/SONY-HA-T10-Step-Up-Transformer-MC-Moving-Coil-Phono-Cartridge-USED-JAPAN-RARE/193131071248?hash=item2cf7824710:g:pYMAAOSwLNpblKR6
Denon HA-500 24db 32db pass
https://www.ebay.com/itm/DENON-HA-500-Step-up-transformer-head-amplifier-AC100V-Free-Shipping-d1030/264728266720?hash=item3da308c7e0:g:UVQAAOSwkZleuiRY
JVC 30 ohm
https://www.ebay.com/itm/JVC-Victor-MC-T100-MC-Step-Up-Transformer/264781535201?hash=item3da63597e1:g:OJAAAOSwy~Je~Ctp
Cinemag 4 ratios: 1:9, 1:12, 1:18 and 1:36 (l or l+r?) (no pass)
1:18 on AT-33PTG/2 would be 5.4mv; 145 ohms
https://www.ebay.com/itm/Moving-Coil-Phono-Step-Up-Transformer-Cinemag-3440AH-4-Ratios-1-9-1-36-MC-SUT/193558279772?hash=item2d10f8f65c:g:pwAAAOSwdehfBJnw
I'll Make My Own
https://www.ebay.com/itm/COIL-WINDING-EQUIPMENT-MODEL-W-S-N-1171-T-440393A-w-FOOT-SWITCH-COUNTER/133247476931?hash=item1f062b24c3:g:LOkAAOSwUHld1tb9
??? Why can't they make one like this ???
https://www.ebay.com/itm/STACO-Energy-3PN1010B-Variable-Auto-Transforer/173800804939?epid=15006512759&hash=item287755d24b:g:EawAAOSwrdlcaySU:sc:FedExHomeDelivery!07062!US!-1
Empty Box ready for your 9 pin transformers of choice
https://www.ebay.com/itm/Moving-Coil-Phono-Step-Up-box-for-RCA-MI-12399-Transformers-MC-SUT-Bogen-T155-HK/193511613150?hash=item2d0e30e2de:g:05gAAOSwcTZeqOW9
same for smaller diameter transformers
https://www.ebay.com/itm/Moving-Coil-Phono-Step-Up-box-for-Sansui-A-603-9-pin-plug-in-Transformers-MCSUT/124163160221?hash=item1ce8b3789d:g:Z2EAAOSwxTZdaaw9
.............................
Finally, Maestro's Remote Controlled Variable Transformer, from the Listening Position. Two required for Stereo
https://www.ebay.com/itm/Lutron-Remote-MA-RH-Maestro-Dual-Control-Dimmer-White-NEW/303506335792?epid=1300142038&hash=item46aa632830:g:kSkAAOSwnAJeX72R
................................
Tiring, but, I had fun seeing how various companies/designers solved things over the years