[Collins] 6AQ5 v. 6BF5?

[C Eus]

All:
I took a look at these two tubes on the NJ7P website.
It looks to me that the 6AQ5 is more robust than the
6BF5. My question: is the 6AQ5 close enough to
substitute for the 6BF5? Certainly the pinouts look
the same but the 6AQ5 appears "beefier". Your
comments, please! Cal, n6KYR/8 P.S. I'm considering
subbing it in the 51S1 audio amp. 

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