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Kora Cosmos Mono Amps

Hi,
I have a pair of wonderful Kora Cosmos Mono Amps and I`m very happy with these amps , but my problem is that I see on the top 2 red lights that are on and now I see the third one !! Can anyone help me what does it mean , please ?
Thank you
teslamade
jsawhitlock
302 posts
 
Teslamade, I use to own the cosmos and the Red LED lights are linked to each of the 5ar4 tubes, when I owned them I had the same problem with one of the LED and it was due to a bad tube, swapped it out and all was good. Another thing to check is the bias.
jsawhitlock
302 posts
 
Oops I meant 6as7 not 5ar4..........
teslamade OP
23 posts
 
Hi,
So when I change the tubes I can`t see the red lights ? Another thing ;check the bias ? What does it mean ?
Thank you Jsawhitlock !
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