Cayin HA-300MK2 (2022) TOTL Transformer coupled Direct Heated Triode Tube HeadAmp (Page 91)
Dec 10, 2023 at 8:27 PM Post #4,891 of 6,222
I'd be willing to bet good money that the folks you were bidding against were also owners of the HA-300 and the MKII.
Haha I thought the exact same thing. It actually turned into a bidding war which I eventually won at around $175 for the lot lol
 
Dec 11, 2023 at 9:10 AM Post #4,893 of 6,222
Dec 11, 2023 at 8:28 PM Post #4,894 of 6,222
Dec 11, 2023 at 8:34 PM Post #4,895 of 6,222
Dec 11, 2023 at 9:34 PM Post #4,896 of 6,222
Took these pics just now of my WE 300b tubes in the dark :heart_eyes:
 

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Dec 12, 2023 at 8:07 PM Post #4,898 of 6,222
You should send those photos to WE because there should be no blue/purple glow in the body of the tube. They may send you new replacement tubes.

Jeff.
Respectfully disagree.

The blue fluorescence at the inside surface of the glass bulb is typically seen with a very good vacuum. A gassy tube will have a blue glow around the filament/grid structure and will draw excessive grid current.
[for reference, I pulled this paragraph from HERE, but the sentiment is accurate enough I didn't feel the need to paraphrase.]

Additional sources:

https://www.thetubestore.com/blue-glow

https://www.diyaudio.com/community/threads/new-we-300bs-blue-glow.11466/

https://forums.stevehoffman.tv/threads/300b-blue-glow-normal-or.782425/

QP6sQXk.jpg


Nothing to worry about - enjoy the light show!
 
Dec 13, 2023 at 1:32 PM Post #4,899 of 6,222
Just got my CV6 adapters in from Deyan. Quad GEC time :)
 
Last edited:
Dec 14, 2023 at 9:50 AM Post #4,901 of 6,222
Respectfully disagree.

The blue fluorescence at the inside surface of the glass bulb is typically seen with a very good vacuum. A gassy tube will have a blue glow around the filament/grid structure and will draw excessive grid current.
[for reference, I pulled this paragraph from HERE, but the sentiment is accurate enough I didn't feel the need to paraphrase.]

Additional sources:

https://www.thetubestore.com/blue-glow

https://www.diyaudio.com/community/threads/new-we-300bs-blue-glow.11466/

https://forums.stevehoffman.tv/threads/300b-blue-glow-normal-or.782425/

QP6sQXk.jpg

Nothing to worry about - enjoy the light show!
You could be correct, but another forum member who had the same problem contacted WE and they told him that a blue glow is normal in that top section of the tube but not acceptable in the body of the tube. WE told him to send the tube back for a free replacement.

Jeff.
 
Dec 14, 2023 at 9:59 AM Post #4,902 of 6,222
You could be correct, but another forum member who had the same problem contacted WE and they told him that a blue glow is normal in that top section of the tube but not acceptable in the body of the tube. WE told him to send the tube back for a free replacement.

Jeff.
Mine glow a little at the top and that is all.
 
Dec 14, 2023 at 10:59 AM Post #4,903 of 6,222
I am sure the blue glow in the picture is just making it look much more pronounced than it really looks in reality. I bet there is nothing wrong with them.

I can take tube pics like that too with my phone, and make them look super bright. :stuck_out_tongue_winking_eye:

@Aeonyx I wouldn't worry about it.
 
Dec 14, 2023 at 1:39 PM Post #4,905 of 6,222
Apos Audio is selling their own brand of 6SN7s.

Kinda pricy at $150 for a matched pair, when you can get some LinLai Elites (that I've seen get really good reviews) for $30 more or some nice NOS for the same price or cheaper.
I didnt see the option to get a matched pair 🤔 I would be curious bc it looks like ex Sophia / Full Music which are not in production any more l.
 

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