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RE: Controlled warm-up option?

Posted by Eli Duttman (A) on August 17, 2015 at 07:52:37

In Reply to: Controlled warm-up option? posted by FenderLover on August 17, 2015 at 04:16:09:

The tube builders were more consistent in indicating controlled heater warm up time, with the 7 and 9 pin mini types. An "A" after the 4 character type indicates controlled heater warm-up time. 12AX7A, 6AQ5A, and 6AU6A are fair examples.

Controlled heater warm-up time was introduced as a cost saving measure in TV sets. Long series heater strings allowed the manufacturers to "cheap out" on power trafo requirements. Without heater warm-up time control, tubes in long series strings experience heater failure. ;>(


Eli D.

• TungSol 6AU6(A) Data Sheet   (Open in New Window)

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