2. amps-preamps
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One of my Tubes on the Jolida 301A flickers

I was playing an LP today and noticed that each time a low frequency measure was being played, the sound was distorted. I played the same measure over again several times and confirmed the existence of distortion not previously heard. I watched the tubes while tracking through this measure and noticed that one of them was getting brighter. Thinking that maybe a tube is ready to go, I swapped it out for the adjacent one to determine if this is a tube issue. The same thing happened with the swapped tube. I tried another tube and again the same thing happened.
Has anyone had the same happen to their amp? Can you share what the root cause was?
Thanks in advance.
switchback

Showing 5 responses by switchback

switchback OP
19 posts
 
The problem persists on the same socket when I swap tubes. I am using EL34's and they all seem to be doing the same thing when moved to V5 position.

Thank you for the response. Sorry it took so long to update.
switchback OP
19 posts
 
I'll check the bias tonight. Hopefully this will fix the issue.
Also, thanks for the information regarding a lower bias setting translates to more bass.

Thanks
switchback OP
19 posts
 
Jerrynsr
Thanks for the advise, the bias adjustment seemed to have corrected the issue.

Thanks again
switchback OP
19 posts
 
Jerrynsr, thanks for the info on the tubes. I'm currently running my source to a CJ pre-amp and I believe (need to check) that I may be bypassing the amp's preamp section. I'm wondering if I should use the tubes you recommended on the CJ unit?
Thanks
switchback OP
19 posts
 
The cj is now connected to a bryston 4b st. My system has never sounded better.
It's true what some say that a high powered byston & maggies are a match made in heaven. These speakers can produce deep and controlled bass.
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