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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!

svcc
oddiofyl's avatar
oddiofyl
3,791 posts
 

I would NOT do it.  The EZ81 draws 1.0 A vs. 0.6 A for the 80.  Could damage DAC

oddiofyl's avatar
oddiofyl
3,791 posts
 

A great reference for tube equivalents is any late model Hickok tube tester owner's manual.   

svcc OP
2 posts
 

Thank you for help and pointing me in the right direction for tube equivalents!

oddiofyl's avatar
oddiofyl
3,791 posts
 

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 

 

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