Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: jake111 on March 15, 2019, 03:51:24 PM

Title: Glow test 2AU7
Post by: jake111 on March 15, 2019, 03:51:24 PM

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

Title: Re: Glow test 2AU7
Post by: Paul Birkeland on March 15, 2019, 05:10:30 PM

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

Title: Re: Glow test 2AU7
Post by: jake111 on March 17, 2019, 11:01:27 PM

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

Title: Re: Glow test 2AU7
Post by: Paul Birkeland on March 18, 2019, 04:26:51 AM

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

Title: Re: Glow test 2AU7
Post by: jake111 on March 18, 2019, 09:26:41 AM

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

Title: Re: Glow test 2AU7
Post by: Paul Birkeland on March 18, 2019, 10:03:16 AM

Quote from: jake111 on March 18, 2019, 09:26:41 AM

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.