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August 18, 2019, 06:51:09 PM

Author Topic: Western Electric 300B Reissue 2018  (Read 1935 times)

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Offline Paul Joppa

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Re: Western Electric 300B Reissue 2018
« Reply #15 on: March 10, 2019, 08:37:57 AM »
patm, did the filaments break? or did they just lose emission?

I have not seen this mentioned anywhere, but the more heavily thoriated a filament is, the more brittle it becomes. In order to achieve enough emissivity without increasing the filament power, I speculate that the filament of the Elrog is very heavily thoriated. (For example, the 71A has a 0.25-amp oxide filament, while the original 71 had a 1.0 amp thoriated tungsten filament.)

If my speculation is correct, then shipping the tubes would be more risky than other tubes.
Paul Joppa

Offline bombay317

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Re: Western Electric 300B Reissue 2018
« Reply #16 on: March 15, 2019, 04:09:02 AM »
I got some tubes and installed them in the Kaiju (which has the DC filament supply).

With the data sheets available, do you have a suggestion on a BeePre modification to be able to use them in there too?
Niagara 7000
Benchmark DAC3L (XBOX1 and TV)
CA Performance w/ Satisfy Turntable
Talismann V2 CA Cartridge
Tavish Designs Adagio Vacuum Tube Phono
Stax SR-009
BeePre 300B w/ BeeQuiet and Cinemag Transformers
Kaiju 300B w/ DC Filament
Jäger Speakers
Transparent and Benchmark Cables