fjh

stupid 5840 question
« on: March 22, 2005, 03:07:55 PM »
I feel a little silly asking this question, but I just finished a Royer mod on a MXL2003 mic.  Unfortunately, I'm not getting any signal from it.  I  traced my circuit against the schematic and it checks out.  I wondered if I might have wired the tube (5840) backwards.  So my question is this:

On the 5840 data sheet, is the diagram showing the pin assignments a "top-down" view or a "bottom-up" view?


ciminosound

stupid 5840 question
« Reply #1 on: March 23, 2005, 09:05:18 AM »
The diagrams are from the viewpoint of holding the tube in your hand and looking at the bottom of it, external view. Not looking at the top of the bulb. Is that what you mean?

fjh

stupid 5840 question
« Reply #2 on: March 23, 2005, 11:39:41 AM »
ooops!

Does this mean I've totally destroyed the tube?

dale116dot7

stupid 5840 question
« Reply #3 on: March 23, 2005, 02:11:34 PM »
I doubt that you've wrecked it.

If you ever have a question on tube pinouts (I sometimes can't remember the basing diagrams either), use an ohmmeter on the filament to check your counting.

-Dale


 

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