B737-400 FLC FAILS TO CONTACT VANCOUVER CTR AFTER LEAVING ZSE SECTOR. CZVR NEVER WAS CONTACTED. CREW CITES FAILURE OF ZSE CTLR TO PERFORM THE HDOF AS A MAJOR CAUSE OF EVENT. CREW FINALLY CONTACTS ZAN CTR ABEAM YAK; AK. PIC ADMITS TO CONVERSING WITH FO AS ANOTHER FACTOR. NO COMPANY INCOMING POSSIBLE; #2 RADIO MISTUNED.

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ENRTE BTWN SEA AND ANC RECEIVED CLRNC FROM ZSE TO ANC VIA DIRECT LAIRE DURING CLBOUT. SUBSEQUENTLY; DID NOT RECEIVE HDOF FROM ZSE TO VANCOUVER CTR. LATER IN THE FLT; REALIZED RADIOS WERE QUIET (LATE NIGHT FLT). TRIED TO CONTACT VANCOUVER CTR TO NO AVAIL. HAVING TRANSITED VANCOUVER CTR; MADE CONTACT WITH ZAN FOR FLT FOLLOWING. CONTRIBUTING FACTOR WAS CONVERSATIONS WITH OTHER PLT AT CRUISE. COMPANY ENRTE RADIO WAS ALSO TUNED 1 DIGIT OFF (8 VERSUS 9). AT NIGHT; DURING A QUIET RADIO ENVIRONMENT; WILL MAKE A HABIT OF PUTTING SOME RADIO CHANGEOVER POINTS ON THE FIX PAGE OF THE FMS AND HAVING VOLUME AND LIGHTS FOR RADIOS TURNED UP HIGHER. SUPPLEMENTAL INFO FROM ACN 376757: THINGS TO CONSIDER TO PREVENT FUTURE OCCURRENCE. 1) KEEP RADIO VOLUME UP LOUD ENOUGH TO PREVENT ANY DISTRS. 2) KNOW THAT RADIO FREQS ARE QUIETER AT NIGHT SO I MIGHT HAVE TO DO A 'RADIO CHK' WITH ATC. 3) BE MORE AWARE OF LOCATION ON RTE THAT CERTAIN RADIO FREQS ARE USED. 4) DON'T ASSUME THAT THE OTHER PLT HAS TALKED WITH ATC ON THE FREQ BEING USED. ASK HIM/HER WHO WE ARE TALKING TO AT THE PRESENT TIME.