"Cook" 10BP4 Sencore CR70

[baursam]

Hi Folks

I just came into possession of a couple 10BP4's, that test in the red on my Sen core CR70. TO COOK a tube slowly, would I

1. Increase the filament voltage from 6.3 to say 8 at bias of 52
2. Strangely enough, if I adjust the cutoff, while I have it at say 7, it immediately pushes it into the green, which I don't think is accurate. Is there a position the cutoff should remain at while completing this process.

I know there is no set rules to this but wanted to get some feedback on the various methods people use with a Sencore CR70

Thanks

Ross