[Amps] 3-500ZG brands

[Clay W7CE]

I've just acquired a Kenwood TL-922A which needs a new pair of finals (one
of the filaments doesn't light up).  Does anyone have experience using the
Taylor or RF Parts branded 3-500ZG tubes in this amp?  Does the cathode bias
need to be changed when switching to the 3-500ZG?  Any recommendations will
be appreciated.

Thanks,
Clay  W7CE