https://www.ebay.com/itm/273983315917?hash=item3fcaad9fcd:g:w8IAAOSw9NZa4env&mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5338306899&toolid=11800&mkevt=1
12AX7
has a filament center tap on pin #9. Connect pin #4 and #5 to one 6
volt wire. Connect pin #9 to the other. This way 12AX7 operates on 6
volts.
150 through 240 volts
isolation transforer = 168v
https://www.petervis.com/electronics%20guides/calculators/transformer-ac-to-dc/ac-to-dc.html
https://www.tubesandmore.com/products/transformer-hammond-low-voltage-filament-open-63-vct
https://www.ebay.com/itm/122699485472?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20200818142055%26meid%3D591b6d7beeac489b9de76e0fc95b2c8b%26pid%3D101113%26rk%3D4%26rkt%3D12%26sd%3D222883414641%26itm%3D122699485472%26pmt%3D1%26noa%3D1%26pg%3D2563228%26algv%3DDefaultOrganicWeb&_trksid=p2563228.c101113.m2108&mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5338306899&toolid=11800&mkevt=1
https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313&_nkw=6.3v+transformer&_sacat=0&mkcid=1&mkrid=711-53200-19255-0&siteid=0&campid=5338306899&toolid=11800&mkevt=1
i
will draw up the schematic and post it. i also have used 2 12v doorbell
transformers back to back thru a basic filter section which gives you
around 160 to 170vdc and you take the filament from the junction btw the
2. i built a pentode od with that ps with a 6sj7 that sounded pretty
good as well.
