Bottlehead Forum

Bottlehead Kits => Kaiju Stereo 300B amp => Topic started by: braubeat on December 21, 2018, 09:18:44 AM

Title: thoriated tungsten 300b tubes
Post by: braubeat on December 21, 2018, 09:18:44 AM: Anybody tried these tubes.

https://www.amazon.com/Shuguang-300b-t-Nature-Matched-Vacuum/dp/B011QVOVL0

They claim to have thoriated tungsten filaments which could be a very good thing.

Much cheaper than the Elrog 300b with thoriated tungsten.

Sadly, I cannot afford them right now but they could be good.

Michael
Title: Re: thoriated tungsten 300b tubes
Post by: Doc B. on December 21, 2018, 12:17:08 PM: from the description-

"can withstand the test of Salt"

good enough for me.
Title: Re: thoriated tungsten 300b tubes
Post by: johnsonad on December 21, 2018, 02:33:56 PM: Quote from: Doc B. on December 21, 2018, 12:17:08 PM
from the description-

"can withstand the test of Salt"

good enough for me.

;D
Title: Re: thoriated tungsten 300b tubes
Post by: Deke609 on December 22, 2018, 01:31:25 AM: Quote from: Doc B. on December 21, 2018, 12:17:08 PM
"can withstand the test of Salt"

A prized quality for salty dogs who enjoy music on the high seas. "Arrr, matey, now there's a seaworthy tube worth many a doubloon."
Title: Re: thoriated tungsten 300b tubes
Post by: Doc B. on December 22, 2018, 05:06:43 AM: I was thinking of salt test that is a little more dry.

https://youtu.be/d7PGdVrmacE
Title: Re: thoriated tungsten 300b tubes
Post by: Paul Birkeland on December 22, 2018, 06:52:00 AM: I would strongly advise against using those until a datasheet is published.

There is a Chinese 845 with an oxide filament that has been for sale for a while, and the filament current required is vastly different than what an 845 would want, so it's a sketchy substitution at best!
Title: Re: thoriated tungsten 300b tubes
Post by: johnsonad on December 22, 2018, 09:34:29 AM: How does the phrase go? Smoke em if you got em?

They Elrogâ€™s sounded great to my ears but lasted less than a year. Iâ€™ll stick to EML and the tried and true EH tubes. I learned my expensive lesson.
Title: Re: thoriated tungsten 300b tubes
Post by: braubeat on December 23, 2018, 08:45:01 AM: Thoriated tungsten DHT's do generally use more current than oxide coated. So that is something to be carefully checked out.

Michael