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Sophia 300B Tube Needed
Sophia 300B Tube Needed
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Old 20th January 2019, 08:38 PM   #1
Imago is offline Imago
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Join Date: Mar 2015
Default Sophia 300B Tube Needed

For some reason one of my Sophia 300B tubes is failing to light the filament.

Anyone have a single they'd like to sell?

Mine are the globe shaped, black base, mesh screen version @ 5V.
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Old 20th January 2019, 09:34 PM   #2
HeyBill is offline HeyBill  United States
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Join Date: Nov 2010
Location: California
Have you checked the pin connections and the filament supply?
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Old 7th February 2019, 06:09 PM   #3
picacho is offline picacho  Mexico
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Join Date: Sep 2012
Location: Aguascalientes
Default Western Electric 300B engraved Base rare for sale

Hi
I have one Western Electric 300B engraved Base very rare 1940-1950 production for sale
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Old 8th February 2019, 04:44 PM   #4
Rush is offline Rush  United States
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Join Date: Sep 2009
Location: Tarpon Springs, Florida
Quote:
Originally Posted by Imago View Post
For some reason one of my Sophia 300B tubes is failing to light the filament.

Anyone have a single they'd like to sell?

Mine are the globe shaped, black base, mesh screen version @ 5V.

I have one Sovtek 300B I would like to get rid of. Not much use on it.
It is marked 53mA/ 5.3 mA/V which I am not sure what it means. I suppose a way of matching, but don't know the parameters. Should not matter for single ended operation though.
The mate to it has the same issue as your bad tube.
PM me if interested.

Rush
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