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Any idea why 6CG7/6FQ7 would be substituted for an ECC85/6AQ8

Posted by IMINTHEBASEMENT (A) on August 28, 2006 at 21:05:39

I bought a no name SE integrated amp an noticed that a 6CG7 was in the ECC85/6AQ8 spot. In the circuit the ECC85 is before the 6BQ5s and after a pair of 12AX7s. Any ideas why this might be used besides the fact that the pinout is the same? I'm a novice in this area and wanted to determine if this was a safe and practical alternative. I have since replaced it with an ECC85/6AQ8, but still curious.
Any wisdom on this is most welcome!

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