RE: [neonixie-l] 8971/7971 tube, strange failure mode

2019-03-24 Thread Jeff Walton 
Your photo shows a tube that is being deprived of high voltage.  Looks the same 
as when the high voltage powers down the 7971 tubes on a MOD-SIX.   Since your 
tube shows this condition in any position, I would be looking to see if there 
is a segment that is bleeding/shorting to ground and starves the other segments 
of HV.  Very odd failure mechanism when it seems to work and then fails.  Try 
all segments on to see if you can reproduce the failure and then switch the 
segments on at a time.  Your clock has this tube segment test mode.

 

Jeff 

 

From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On 
Behalf Of Kevin A.
Sent: Sunday, March 24, 2019 2:01 PM
To: neonixie-l@googlegroups.com
Subject: Re: [neonixie-l] 8971/7971 tube, strange failure mode

 

I'll have him try that next. Should be easy to do since the software provides a 
segment test routine. 

 

On Sun, Mar 24, 2019, 2:55 PM Thomas Kummer  wrote:

Does it do it when a particular cathode, or number is attempted to be lit? 

Sent from my iPhone


On Mar 24, 2019, at 14:48, Kevin A.  wrote:

Yup, the same tube does the same thing when in a different position. 

 

On Sun, Mar 24, 2019, 2:34 PM Nicholas Stock  wrote:

If you move the tube to a different position does it do the same thing?

Sent from my iPhone


On Mar 24, 2019, at 10:44, Kevin A.  wrote:

Here is a picture of the tube when it experiences failure. 

 

On Sun, Mar 24, 2019, 1:43 PM Kevin A.  wrote:

Hi guys,

I've got a friend who has an 8971 clock. When the clock is first powered on, 
the tubes work fine. 10 seconds into running, the last tube (in position 6) 
starts fizzling out. However, when you turn the clock off and on again, the one 
tube repeats the same failure mode after 10 seconds again. It doesn't appear to 
be out gassed, but maybe there is a strange short in it somewhere?

Any suggestions would be appreciated. 

Thanks,
Kevin 

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Re: [neonixie-l] 8971/7971 tube, strange failure mode

2019-03-24 Thread Kevin A. 
I'll have him try that next. Should be easy to do since the software
provides a segment test routine.

On Sun, Mar 24, 2019, 2:55 PM Thomas Kummer  wrote:

> Does it do it when a particular cathode, or number is attempted to be lit?
>
> Sent from my iPhone
>
> On Mar 24, 2019, at 14:48, Kevin A.  wrote:
>
> Yup, the same tube does the same thing when in a different position.
>
> On Sun, Mar 24, 2019, 2:34 PM Nicholas Stock  wrote:
>
>> If you move the tube to a different position does it do the same thing?
>>
>> Sent from my iPhone
>>
>> On Mar 24, 2019, at 10:44, Kevin A. 
>> wrote:
>>
>> Here is a picture of the tube when it experiences failure.
>>
>> On Sun, Mar 24, 2019, 1:43 PM Kevin A. 
>> wrote:
>>
>>> Hi guys,
>>>
>>> I've got a friend who has an 8971 clock. When the clock is first powered
>>> on, the tubes work fine. 10 seconds into running, the last tube (in
>>> position 6) starts fizzling out. However, when you turn the clock off and
>>> on again, the one tube repeats the same failure mode after 10 seconds
>>> again. It doesn't appear to be out gassed, but maybe there is a strange
>>> short in it somewhere?
>>>
>>> Any suggestions would be appreciated.
>>>
>>> Thanks,
>>> Kevin
>>>
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Re: [neonixie-l] 8971/7971 tube, strange failure mode

2019-03-24 Thread Thomas Kummer 
Does it do it when a particular cathode, or number is attempted to be lit? 

Sent from my iPhone

> On Mar 24, 2019, at 14:48, Kevin A.  wrote:
> 
> Yup, the same tube does the same thing when in a different position. 
> 
>> On Sun, Mar 24, 2019, 2:34 PM Nicholas Stock  wrote:
>> If you move the tube to a different position does it do the same thing?
>> 
>> Sent from my iPhone
>> 
>>> On Mar 24, 2019, at 10:44, Kevin A.  wrote:
>>> 
>>> Here is a picture of the tube when it experiences failure. 
>>> 
 On Sun, Mar 24, 2019, 1:43 PM Kevin A.  
 wrote:
 Hi guys,
 
 I've got a friend who has an 8971 clock. When the clock is first powered 
 on, the tubes work fine. 10 seconds into running, the last tube (in 
 position 6) starts fizzling out. However, when you turn the clock off and 
 on again, the one tube repeats the same failure mode after 10 seconds 
 again. It doesn't appear to be out gassed, but maybe there is a strange 
 short in it somewhere?
 
 Any suggestions would be appreciated. 
 
 Thanks,
 Kevin 
 
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Re: [neonixie-l] 8971/7971 tube, strange failure mode

2019-03-24 Thread Kevin A. 
Yup, the same tube does the same thing when in a different position.

On Sun, Mar 24, 2019, 2:34 PM Nicholas Stock  wrote:

> If you move the tube to a different position does it do the same thing?
>
> Sent from my iPhone
>
> On Mar 24, 2019, at 10:44, Kevin A.  wrote:
>
> Here is a picture of the tube when it experiences failure.
>
> On Sun, Mar 24, 2019, 1:43 PM Kevin A. 
> wrote:
>
>> Hi guys,
>>
>> I've got a friend who has an 8971 clock. When the clock is first powered
>> on, the tubes work fine. 10 seconds into running, the last tube (in
>> position 6) starts fizzling out. However, when you turn the clock off and
>> on again, the one tube repeats the same failure mode after 10 seconds
>> again. It doesn't appear to be out gassed, but maybe there is a strange
>> short in it somewhere?
>>
>> Any suggestions would be appreciated.
>>
>> Thanks,
>> Kevin
>>
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Re: [neonixie-l] 8971/7971 tube, strange failure mode

2019-03-24 Thread Nicholas Stock 
If you move the tube to a different position does it do the same thing?

Sent from my iPhone

> On Mar 24, 2019, at 10:44, Kevin A.  wrote:
> 
> Here is a picture of the tube when it experiences failure. 
> 
>> On Sun, Mar 24, 2019, 1:43 PM Kevin A.  wrote:
>> Hi guys,
>> 
>> I've got a friend who has an 8971 clock. When the clock is first powered on, 
>> the tubes work fine. 10 seconds into running, the last tube (in position 6) 
>> starts fizzling out. However, when you turn the clock off and on again, the 
>> one tube repeats the same failure mode after 10 seconds again. It doesn't 
>> appear to be out gassed, but maybe there is a strange short in it somewhere?
>> 
>> Any suggestions would be appreciated. 
>> 
>> Thanks,
>> Kevin 
>> 
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[neonixie-l] 8971/7971 tube, strange failure mode

2019-03-24 Thread Kevin A. 
Hi guys,

I've got a friend who has an 8971 clock. When the clock is first powered on, 
the tubes work fine. 10 seconds into running, the last tube (in position 6) 
starts fizzling out. However, when you turn the clock off and on again, the one 
tube repeats the same failure mode after 10 seconds again. It doesn't appear to 
be out gassed, but maybe there is a strange short in it somewhere?

Any suggestions would be appreciated. 

Thanks,
Kevin 

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