Help wanted re tube


Recently the sound level on one of my speakers dropped below that of the other. By trial and error I tracked the fault to my tube based CD/SACD player. I decided to try changing the tubes. One tube was an 6H3ne for which I had a spare but the other was  a GE 9 pin tube marked LN188-5 and 6829, a tube I am not familiar with. Can any of you tube experts out there provide any info on the tube and on which tubes might be compatible? 
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