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 Post subject: Built -In Spare Tube
PostPosted: Jun Tue 22, 2021 4:03 pm 
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Ran across this ad in an old ARC....


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 Post subject: Re: Built -In Spare Tube
PostPosted: Jun Tue 22, 2021 4:10 pm 
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So how successful were those? Another flash in the pan like flat tubes? Were they cheaper than two tubes?


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 Post subject: Re: Built -In Spare Tube
PostPosted: Jun Tue 22, 2021 4:16 pm 
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Was this ad in an April issue of ARC and or published originally in an April radio magazine of the 20's?

I am suspicious of the corporate name of "Phule Lamp Works" (Fool) :lol:

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 Post subject: Re: Built -In Spare Tube
PostPosted: Jun Tue 22, 2021 4:55 pm 
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That could have been invented by Mohammed Ullyses Fips. https://www.amazon.com/Collected-Works- ... 1450559859


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 Post subject: Re: Built -In Spare Tube
PostPosted: Jun Tue 22, 2021 5:57 pm 
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Don't remember which issue of ARC it was in. I am in the process of saving the first pages of many old ARC and tossing the rest of the issue. There's a lot of good articles and information at the front of the issues and I want to save those, but I don't want to have to store the rest of the issue which is just ads and auction prices. I think its just a joke ad that ARC created.

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 Post subject: Re: Built -In Spare Tube
PostPosted: Jun Thu 24, 2021 11:39 pm 
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"Phule Lamp Works" is an excellent April Phules name for a fictitious tube manufacturer.

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 Post subject: Re: Built -In Spare Tube
PostPosted: Jun Fri 25, 2021 12:47 am 
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Elmer Cunningham's tubular "AudioTron" had a spare filament section (center-tapped filament) that would allow the user to switch wires over to the good half after the first one burned out.

http://uv201.com/Tube_Pages/audiotron.htm


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 Post subject: Re: Built -In Spare Tube
PostPosted: Jun Fri 25, 2021 12:39 pm 
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That is as long as the burned out filament didn't fall against the grid.

Then again, it may be possible to burn it off.

-Steve

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 Post subject: Re: Built -In Spare Tube
PostPosted: Jun Fri 25, 2021 5:00 pm 
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Not an Audion expert, but didn't DeForest have a version of the dual filament too?

Collecting teens and 20's era oddball receiving tubes can be quite challenging... Working examples are even harder to find... chas

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 Post subject: Re: Built -In Spare Tube
PostPosted: Jun Sat 26, 2021 2:25 pm 
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Some De Forest Audions had what might be termed a "tapped" filament (and you thought there was anything new about a 35Z5!) They can be identified by an extra wire emerging from above the screw base with a piece of cambric tubing over it. You used one half of the filament and when it burned out, you soldered the spare wire to the base and used the other half.

Do a search on 1260 Bushwick Avenue, Brooklyn. It's a three story frame row house that has been there since the late 1890s. While it is possible somebody was using it as their business mailing address, it sure doesn't look like it ever housed a radio tube factory. Methinks 'Phule' = fool, as in this was ARC's idea of an April Phules joke.

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 Post subject: Re: Built -In Spare Tube
PostPosted: Jun Sat 26, 2021 4:27 pm 
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I would think the clean split down the center of the glass envelope, clearly showing two separate tubes that were merged together through the magic of photoshop or old fashioned photo retouching, and the rather amateurish hand drawn company logo would pretty much indicate to anybody that this was an April Fools joke. Apparently this was and still is a very good Aprils Fools joke.

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