[Hallicrafters] SX-28: Fast HT rise - long term stress on the receiver's tubes?

[jeff]

Hi, 
Ive been wondering if the quick rise-time of the HT (4 secs?) due to the directly heated 5Z3 can cause cathode stripping of the other receiving tubes which are slower to warm up, and therefore reduce the working life of those tubes?

I havent had my SX-28 long enough to know if tube life is possibly shorter than it should be due to this.

Id appreciate comments on this.
regards,
JEFF
ZL3JK