Can a 12au7 and 12au7a be used at the same time?

[hron61]

Silly question i know.
I have a foreplay ll and am wondering if a 12au7 and a 12au7a tube can be used at the same time together.
I usually use either 12au7 or 12au7a but have never mixed them. Curious as to what the implications (good or bad) might be.

[Paul Birkeland]

There are no issues with doing this in anything we have made that uses the 12AU7.  The "A" just denotes a controlled heater warm up time that is helpful when you have heaters wired in series, and this just doesn't have any impact on any of our circuits. 

[hron61]

Thanks Paul, much appreciated.