If you must go western, the 5687 is far closer to the 6H30 than the 6DJ8 family of tubes and would be my personal preference. J8‘s will burn up in no time at anything like the bias h30‘s generally run at. Again I have used these in my builds, and in the right application they are a fine tube.
From the jacmusic site:
It is found in many amplifiers, such as: Audio Note M3, Manley Jumbo Shrimp,Ayon CD player, Audio Note DAC 5 Signature and Audio Note amp kits, M5 preamp, M9, KR Enterprise 32BSI integrated SET amp, Modwright 9.0 and Modwright Sony and Denon modded CD players, Modwright Sony NS999ES CD player, Opera Audio Consonance Cyber 800, Zanden, Manley amps, LUX 300B amp,Kondo M1000, Artemis Labs linestage, Emotive Audio Sira, Ray Samuels B52 and Raptor, Audio Tekne TFM-9412, Sonic Frontiers Power 2 Amps, Audio Experience BALANCED A2 preamp (YS-AUDIO, HONG KONG), Ongaku, Audio Note, New Audio Frontiers Legend II preamp, Loth X JI300,Audio Thrills, Mastersound, Sophia Electric KT88 Tube Amplifier, Icon Audio PS3 phono power supply, Almarro.