I've never heard of a 6922 that folks called warm. Their claim to fame is clarity and details iirc. There are adapters to allow for the use of different tube types, maybe that'll be an answer for you
Warm sounding 6922 Type Tubes
Any suggestions for a warm sounding 6922 type tube for my Dac. I’m currently using a NOS Mullard 6DJ8 but I’m looking for a bit more warmth to tame some brighter recordings.