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exurbia 30th May 2009 05:13 AM

5718 Nuvistor ?
A question for the "Cold Warriors"

Is the 5718 classed as a Nuvistor ?
What was it used for and is it worth hanging onto ? I have a bag of these, at least twenty. They are all JHS5718 and marked Sylvania gold brand and they all have the same codes on them.
As a medium Mu triode, could they be used in pairs to replace the at-au7 family in low volt application ?
Sorry about all the questions, i normally build speakers and have my amps built for me.

woody 30th May 2009 05:36 AM

No it's a subminiture tube a nuvistor is a lot smaller.
I believe nost if not all nuvistors fit in a socket and were

exurbia 30th May 2009 05:42 AM

Thanks woody, i have the datasheet now from Valvo/Philips. I had visions there of making a killing on feebay.

kmaier 31st May 2009 04:36 PM

The 5718 is a neat peanut tube actually... was looking at them last year as Surplus Sales has about 4700 of them, $5 each. Pic is here:

Regards, KM

magicsamin 1st June 2009 05:16 PM

7518 Nuvistor (not!)
The trade name Nuvistor was a design from the late '50's by RCA. A wonderful design, cut short by the proliferation of UHF capable sand!

The subminiature tubes such as the 5718 are a much older design inspired by the military needs of the early 20th century war efforts. They have amazing resistance to shock and microphonics, due to the small geometry and tight construction tolerances.

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