The only difference between the 12AU7 and the 12AU7A is the “A” version can be used in series string filament circuits due to it’s controlled warm-up cathode. Otherwise, there is no difference. Both of these are “milspec” versions of the 12AU7.

How long do 12AU7 tubes last?

between 5,000 and 10,000 hours
Tube Life. Small signal tubes like 12AX7 and 12AU7 typically last between 5,000 and 10,000 hours. You don’t need a tube tester to determine if your tubes need replacing. Simply plug in a new pair and let them settle in for at least 100 hours.

Is the ECC82 the same as a 12AU7?

The 12AU7 name is its American or “common” name while the ECC82 title is its European name and Mullard Phillips tube designation. There is no difference between the components of the two tubes and they are interchangeable.

Do 12AX7 tubes need to be matched?

What is this? Using 12AX7s as an example, matching these preamp tubes is a good idea, but by no means essential. These tubes, along with the 6DJ8 variety, are known as linestage tubes. When they are matched, this will ensure that you get even gain from both tubes.

What is the difference between 12AU7 and 5963 tubes?

5963: This is a nice industrial type which is nearly identical to the standard 12AU7. RCA made a nice black-plate version of this tube, Sylvania has a gold pin version, and GE has it in their 5-star broadcast line. The plate voltage rating is a little lower than for a 12AU7, but for most applications, it will work fine.

Will the 5963 replace 12au7/ecc82?

What you see now, the 5963 MAY replace 12AU7 /ECC82 in probably the most applications, but maximum limits are less good with 5963. However as that table says clearly, that is for digital applications. If you would compromise on the speed, or extreme long cut off, you would be able to exceed those specifications.

What is the difference between 6189 and 12au7wa?

6189/E82CC: This can be both a military spec tube and a premium industrial tube. Often, the military versions will be marked 12AU7WA in addition to having 6189 etched in the glass. The older vintage of these tubes are usually black-plate with the extra “triple mica” spacer at the top.

What is the best 12 au7wa Tube brand?

Sylvania 6189/12AU7WA Gold Brand with GOLD PINS NEW (NOS) These are VERY HIGH QUALITY tubes which are QUITE RARE. They excellent choice for any audio application that calls for 12AU7. Tested Good For Gain, Transconductance, Noise and Microphonics RCA made good quality 12AU7’s.