[Boatanchors] Relay WTB and your experience with Nuvistor tubes

[J. Forster]

On the Nuvistor failures, some reasons might be:

The nuvistors can be dropped, but not shatter, and sustain seal damage.

The ratio of surface and s4eaql area / tube volume is much higher so they
would go gassy more easily.

The element spacing is far smaller, so more suceptible to shock damage.

The low filament power means thinner wires that are more delicate.

The pins are not as robust as 9, 8, 0r 9 pin tubes.

FWIW,

-John

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>
>
>
> Hi, I am in need of a coax relay. It is a Dow-Key type DK2-60B type. It is
> a DPDT relay with an internal jumper in the de-energized position. It has
> 4 connectors.
> I'll take either UHF or N connectors, any voltage coil, and any quality
> mfg.
> I have a BNC version of this relay, but would prefer the larger model.
>
> On the subject of the Nuvistors.... I have a LOT of vintage equipment that
> uses these tubes.
> (I collect Parks and other Nuvistor converters and preamps) Why? I have NO
> idea!! ha ha
> I have been purchasing many spare 6CW4s and 6DS4s as I come across them
> for a good price. I have experienced a high failure rate with these tubes.
> Both in equipment as received and some of the spares I have purchased as
> well.
> I have thousands of vacuum tubes and the failure rate of the Nuvistors
> seem to be much, much higher than the 7 and 9 pin jobs.
>
> Comments? Construction problems with the small tubes?
>
> I have plenty of spares, but just wanted to ask the group if my experience
> is normal.
>
> thanks!!
>
> ron
> N4UE
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