Re: [neonixie-l] IN-13 Lifespan

2017-01-31 Thread Joe Croft 
I am surprised they lasted so long!

-joe


On Jan 30, 2017 12:20 PM, "TheJBW"  wrote:

Joe,
I actually discovered exactly this late last night. Hadn't gotten around to
replying yet. Turns out that the simple footprint got flipped at some
point. I didn't think that the tubes would operate correctly at all with
the anode swapped for the auxiliary cathode, but they seem to have lasted
for 18months!

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Re: [neonixie-l] IN-13 Lifespan

2017-01-30 Thread Joe Croft 
When I had a tube that took 15ma to drive it, I discoved that I had the two
'anodes' wired backwards. The tube had a short life, in the order of weeks
running full time.

-joe

On Jan 23, 2017 1:41 PM, "TheJBW"  wrote:

> About 1.5years ago, I built this really nice stereo vu-meter using IN-13
> bargraph tubes. About two weeks ago, one of the tubes made a "tink" sound
> and the current control went away -- the tube stayed ignited, but the "bar"
> was stuck at the bottom. I noticed that the spacer at the far end of the
> tube was also suddenly free. I figured this was an unlikely failure, so I
> replaced the tube the spare stock. Unfortunately, one week later, the tube
> on the other channel did the exact same thing! I've attached pictures of my
> drive and power circuitry -- the signal conditioning circuitry is omitted,
> but I think it unlikely to be relevant. I figure something must be wrong
> with my circuit that is causing early death, but I'm not sure as to what.
> Ideas anyone?
>
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Re: [neonixie-l] IN-13 Lifespan

2017-01-23 Thread JohnK 
But, if you get the maths right you can actually mimic the response.
[I have audio and broadcast radio station background btw]
Been here before with this argument of course. So, it is possible to get the 
same indication but that leaves the semantics to deal with.
And there are subtle aspects of the visual persistence of different displays to 
deal with too.

The argument usually revolves around the substitution of standard moving coil 
meters for the correct type. The original spec document is on the web. The 
attenuator that 'must' be used and the standard levels topic gets quite 
interesting. 
[Talking about the way the indicated value on the meter when used in its most 
sensitive setting got used as the way to refer to the actual level, rather than 
the fact that the actual level was higher - I didn't tell that story very well; 
have a look at the specs and the circuit and how the common useage developed.]

John Kaesehagen
Australia
  - Original Message - 
  From: Instrument Resources of America 
  To: neonixie-l@googlegroups.com 
  Sent: Tuesday, January 24, 2017 6:52 AM
  Subject: Re: [neonixie-l] IN-13 Lifespan


  As far as I know, one can NOT build a bar-graph, or neon lamp style, LED, or 
any other indicator type, of VU meter. (Perhaps you built a 'level indicator' 
of sorts.) The very definition of a VU meter (at least the professional type) 
involves the mechanical ballistic damping, and mechanical response of the 
needle and the meter movement.   Ira.




  On 1/23/2017 11:41 AM, TheJBW wrote:

About 1.5years ago, I built this really nice stereo vu-meter using IN-13 
bargraph tubes. About two weeks ago, one of the tubes made a "tink" sound and 
the current control went away -- the tube stayed ignited, but the "bar" was 
stuck at the bottom. I noticed that the spacer at the far end of the tube was 
also suddenly free. I figured this was an unlikely failure, so I replaced the 
tube the spare stock. Unfortunately, one week later, the tube on the other 
channel did the exact same thing! I've attached pictures of my drive and power 
circuitry -- the signal conditioning circuitry is omitted, but I think it 
unlikely to be relevant. I figure something must be wrong with my circuit that 
is causing early death, but I'm not sure as to what. Ideas anyone?

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Re: [neonixie-l] IN-13 Lifespan

2017-01-23 Thread Instrument Resources of America 
As far as I know, one can NOT build a bar-graph, or neon lamp style, 
LED, or any other indicator type, of VU meter. (Perhaps you built a 
'level indicator' of sorts.) The very definition of a VU meter (at least 
the professional type) involves the mechanical ballistic damping, and 
mechanical response of the needle and the meter movement.   Ira.



On 1/23/2017 11:41 AM, TheJBW wrote:
About 1.5years ago, I built this really nice stereo vu-meter using 
IN-13 bargraph tubes. About two weeks ago, one of the tubes made a 
"tink" sound and the current control went away -- the tube stayed 
ignited, but the "bar" was stuck at the bottom. I noticed that the 
spacer at the far end of the tube was also suddenly free. I figured 
this was an unlikely failure, so I replaced the tube the spare stock. 
Unfortunately, one week later, the tube on the other channel did the 
exact same thing! I've attached pictures of my drive and power 
circuitry -- the signal conditioning circuitry is omitted, but I think 
it unlikely to be relevant. I figure something must be wrong with my 
circuit that is causing early death, but I'm not sure as to what. 
Ideas anyone?

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<>

[neonixie-l] IN-13 Lifespan

2017-01-23 Thread TheJBW 
About 1.5years ago, I built this really nice stereo vu-meter using IN-13 
bargraph tubes. About two weeks ago, one of the tubes made a "tink" sound 
and the current control went away -- the tube stayed ignited, but the "bar" 
was stuck at the bottom. I noticed that the spacer at the far end of the 
tube was also suddenly free. I figured this was an unlikely failure, so I 
replaced the tube the spare stock. Unfortunately, one week later, the tube 
on the other channel did the exact same thing! I've attached pictures of my 
drive and power circuitry -- the signal conditioning circuitry is omitted, 
but I think it unlikely to be relevant. I figure something must be wrong 
with my circuit that is causing early death, but I'm not sure as to what. 
Ideas anyone?

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