Will an EV-81 tube fit in a Border Patrol DAC?

Hello, I would like to replace the stock EZ80 rectifier

with an EZ81 rectifier in a Border Patrol DAC but don’t

know how to. There doesn’t appear to be enough room

in the tube chassis to do so, since the 81 tube is 3/4 inch

longer than the 80

Any help would be greatly appreciated.
thank you!

svcc07-27-2024 3:57am

oddiofyl Details Discussions Posts This discussion Message User 3,696 posts 07-27-2024 at 11:12am Copy Comment URL Report Comment Edit Delete A great reference for tube equivalents is any late model Hickok tube tester owner's manual.
svcc OP Details Discussions Posts This discussion Message User 2 posts 07-27-2024 at 02:00pm Copy Comment URL Report Comment Edit Delete Thank you for help and pointing me in the right direction for tube equivalents!
oddiofyl Details Discussions Posts This discussion Message User 3,696 posts 07-27-2024 at 11:35pm Copy Comment URL Report Comment Edit Delete Sure. You always want the pin out the same , most important! And also important is the filament voltage and heater current. Look up a Hickok tube sheet for 12ax7. You will see there are a number of variants, ECC83,7025, CV4004. 12ax7 and 7025 are US designations , ECC is European , CV is a British variant. Here's an example of EZ80 and it's cousins. If you notice there are certain caveats. I always check the tube data to make sure what is on a sellers page is correct
Post removed Jul 27, 2024
oddiofyl Details Discussions Posts This discussion Message User 3,696 posts 07-27-2024 at 11:38pm Copy Comment URL Report Comment Edit Delete https://www.vivatubes.com/6ca4-ez81-6v4-ez80/#:~:text=The%206V4%20and%20EZ80%20are,can%20handle%20higher%20plate%20voltage.