If you want to hear the real KRTH Christmas Classics, without Barry Manilow, Air Supply, and the god-awful Mannheim Steamroller, tune in Tuesday nights 8-12pm. It is what they call "HD Tuesday" and they play only 50s and 60s music.
The rest of the time, KRTH is playing similar stuff as the last few years, albeit with a few more spins of Elvis, Ray Coniff, and the Beach Boys. Nice. Still need to dump some of the KOST dreck, but it's a little better.
If you REALLY want great Xmas oldies that won't bore you, check out WLNG, from Long Island. Online at wlng.com