AMZ FX ANALOG ALCHEMY GEOFX MEF ROG MEF DIY WIKI

Noob to tubes question

Started by Govmnt_Lacky, October 03, 2010, 04:58:30 PM

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Govmnt_Lacky

October 03, 2010, 04:58:30 PM
When the tube (in this case, a 12AX7) datasheet states that the heater voltage needs to be 12.6V SERIES or 6.3V PARALLEL..... What does that mean?

The 12AX7 tube heater taps are pins 4 and 5 with a center-tap at pin 9.
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CynicalMan

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October 03, 2010, 05:26:38 PM
Each of the two triodes in a 12AX7 needs 6.3V on the heaters. If you are using a 12.6V heater supply, connect the heaters of the two triodes in series, or connect the 12.6V to pins 4 and 5. If you are using a 6.3V heater supply, connect the heaters of the two triodes in parallel, or, connect pins four and five together and connect the 6.3V to pins 4/5 and 9.

You can see here how the heaters are connected:
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