Re: [neonixie-l] Time for my annual (?) question...mostly for David F....

['Grahame' via neonixie-l]

Hi Kerry

Are you after a DF kit specifically or would you consider other kits? I 
can only help you with this kit:


http://www.sgitheach.org.uk/scope3.html

I provide as much or as little as people want up to a complete kit 
including acrylic case and CRT. Or you choose a CRT and I will customise 
the kit to work with it (if compatible). Contact me via the web site if 
you are interested.


The technology is the same as David pioneered - Lissajous based circle 
drawing.


Grahame

On 13/06/2018 23:42, 'orange_glow_fan' via neonixie-l wrote:

Another year has come  (and gone)..

Posting to see if there is an update on the new oscilloscope clock kit..

Just pointing out that I am getting OLDer and the time will come when 
the old eyes and hands won't be up to building kits anymore..


No pressure!

Kerry.




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Re: [neonixie-l] Time for my annual (?) question...mostly for David F....

[NeonJohn]

On 06/15/2018 07:34 AM, 'Grahame' via neonixie-l wrote:
> Hi Kerry
> 
> Are you after a DF kit specifically or would you consider other kits? I
> can only help you with this kit:
> 
> http://www.sgitheach.org.uk/scope3.html
> 
> I provide as much or as little as people want up to a complete kit
> including acrylic case and CRT. Or you choose a CRT and I will customise
> the kit to work with it (if compatible). Contact me via the web site if
> you are interested.
> 
> The technology is the same as David pioneered - Lissajous based circle
> drawing.
> 
> Grahame

Hi Grahame,

I want to buy a fully assembled and tested clock.  I prefer the short
persistence green phosphor.  How long do you think it will be until
these are available?  Estimated price?  Does it come standard with the
GPS module or is that an accessory?

Thanks
John


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Re: [neonixie-l] Time for my annual (?) question...mostly for David F....

[gregebert]

On a related note, are there any recommendations for a CRT that is known to 
be reliable and not easily burned from long-term usage ?
That would influence my choice for a scope-clock kit.

I have yet to fire-up one of my 3L01I tubes, and so far I've seen mixed 
reviews on it's phosphor life.
Maybe it's penance for all those CRTs I enjoyed smashing years ago

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Re: [neonixie-l] Time for my annual (?) question...mostly for David F....

['Grahame' via neonixie-l]

I've read that for green phosphors, P31 is supposed to be "tougher" than 
P1. But I've not seen data that compares phosphor life between other types.


I approach the problem with aggressive screen saving using a PIR to 
detect room occupancy. When nobody is detected I change the display from 
a fairly static clock image to something much more bouncy. Then I shut 
off the EHT after a while longer, then eventually turn off the heater as 
well. When the clock faces are displayed I jiggle the image in a X/Y 
pattern to try to even out the screen usage.


I suppose its the same logic as "savers" with nixies to reduce or spread 
wear.


Grahame

On 15/06/2018 16:45, gregebert wrote:
On a related note, are there any recommendations for a CRT that is 
known to be reliable and not easily burned from long-term usage ?

That would influence my choice for a scope-clock kit.

I have yet to fire-up one of my 3L01I tubes, and so far I've seen 
mixed reviews on it's phosphor life.

Maybe it's penance for all those CRTs I enjoyed smashing years ago
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Re: [neonixie-l] Time for my annual (?) question...mostly for David F....

[John Rehwinkel]

> On a related note, are there any recommendations for a CRT that is known to 
> be reliable and not easily burned from long-term usage ?
> That would influence my choice for a scope-clock kit.

The 3RP1 and its flat-face variant 3RP1A are popular choices, they're common 
and durable (they may even still be produced, in China).

The 2AP1 is cheap and common.

There are several likely 5" tubes out there, including some with variant 
phosphors that may give longer life.  There are a lot of old
Tektronix oscilloscope tubes out there on eBay, they're very well made and 
durable, but many of them want high PDA voltages (I
think Grahame's design can support them, but I'm not sure of the limits).  Some 
of the early Tektronix CRTs (which will generally be
a good bet for a scope clock) also have RETMA designations, like the 5ABPx 
(available in the generic P1, the P7 yellow/blue cascade
phosphor, and the P11 blue photographic phosphor).

Possibly useful list here:
http://w140.com/tekwiki/wiki/Cathode-ray_tube

> I have yet to fire-up one of my 3L01I tubes, and so far I've seen mixed 
> reviews on it's phosphor life.

It has a very thin phosphor layer, and life isn't good.  The 6LO1I might be a 
better choice, it's another Russian tube that has a larger, rectangular face,
and probably better lifetime.  It's also fairly common and affordable.

> Maybe it's penance for all those CRTs I enjoyed smashing years ago

We all did some dumb things in our earlier days.

- John

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Re: [neonixie-l] Time for my annual (?) question...mostly for David F....

[Charles MacDonald]

On 18-06-15 12:01 PM, 'Grahame' via neonixie-l wrote:
I've read that for green phosphors, P31 is supposed to be "tougher" than 
P1. But I've not seen data that compares phosphor life between other types.


Looked up the Original Registration by Mullard for P31, P32 and P33. 
Document gives persistence and Spectrum curves but no claims for 
lifetime. Zinc Sulphide with a copper activator.


Registered in 1960 under release 2746 along with type CRT 9RP33, which 
corresponds to Mullard type AL22-10.  (P33 is Orange BTW)


(Having the JEDIC data is So handy, everyone should immediately send 50 
bucks US  to the Tube Collectors Association to get a copy)


--
Charles MacDonald Stittsville Ontario
cm...@zeusprune.ca  Just Beyond the Fringe
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Re: [neonixie-l] Time for my annual (?) question...mostly for David F....

[gregebert]

So it looks like short-persistence phosphors are the ones with the highest 
burn-resistance, and data certainly favors P31

I was hoping that long-persistence phosphor would have higher burn 
resistance; I always liked "old" IBM 3278 terminals from the early 1980's 
that had a very pleasant green color and they didn't seem to burn easily. 
The long persistence allowed lower-speed logic to control the raw video, 
and as a result, it had excellent clarity. No dot-smear at all, which was 
common with other CRTs at that time. If anyone knows what type of phosphor 
was used, please post.

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