Glow test 2AU7

[jake111]

I have the lower front and back of the 2AU7 glowing, the upper part only glows in the front. Is this normal?
Thanks, Jess

 

[Paul Birkeland]

That could be totally normal depending on the 12AU7.  Sometimes the placement of the heater inside the cathode sleeve isn't 100% consistent between halves (and it doesn't need to be).

-PB

 

[jake111]

Finished and sounding great with HD 6XX.
The voltage test terminals that were supposed to be 0v were a bit higher.
3. 00.3v
6. 00.3v
8. 00.5v
10. 00.3v
Is this something to be concerned about?

Jess

 

[Paul Birkeland]

This is probably not an issue.  If your meter has different ranges, it may not resolve 0V very well on a setting like 200V. 

 

[jake111]

The chassis plate gets pretty darn hot. Is there a temp range for that?

 

[Paul Birkeland]

The chassis plate gets pretty darn hot. Is there a temp range for that?

If you pass your voltage checks, the chassis plate temperature is appropriate.