Not to unnecessarily confuse things, but a 6N1P has twice the heater current of a 6922. So if you're substituting a 6922 in a component that uses a 6N1P natively, no problem. But if your component uses a 6922 natively, then caution is due if you want to substitute a 6N1P (especially if pairs are involved). Be sure the component can handle the extra current. Just for reference, the 2C51, 396A, 6CC42 all have 300 milliamps of heater current and the 5670 and 6N3P have 350. The 6922, 6DJ8, and 12AU7 (when run at 6.3v) all have 300. The 6N1P is the outlier with 600 milliamps even though it is pin compatible with the 6922.