Re: [neonixie-l] While we're talking 7971's, I have a 4LW clock question

[Kevin A.]

I think the FLW design is also multiplexed as opposed to direct drive. That
could very well have something to do with the flickering. Is there any way
to tweak the switching frequency of the mux or is it fixed?

On Tue, Apr 16, 2019, 1:37 AM Michail Wilson  wrote:

> Strange, but it could still be the tube.
>
>
>
> I have a bunch that are slower to trigger / require more power.
>
>
>
> I also have the 4LW clock which I typically swap tubes in to see how they
> perform.
>
> Some delay, some flicker.   When I power directly and add more current
> and/or voltage, they seem fine.
>
>
>
> Michail
>
>
>
> *From:* neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] *On
> Behalf Of *Kevin A.
> *Sent:* Monday, April 15, 2019 7:55 PM
> *To:* neonixie-l
> *Subject:* Re: [neonixie-l] While we're talking 7971's, I have a 4LW
> clock question
>
>
>
> Maybe the high voltage supply is tapped out; just not enough current for
> all 4 tubes at once. Or the high voltage is a bit low and causing
> inconsistent ionization across tubes. It could also be a combination of
> both where the power supply voltage drops when the tubes are brought up,
> and the last tube to light has to ignite when the voltage is lowest.
>
>
>
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RE: [neonixie-l] While we're talking 7971's, I have a 4LW clock question

[Michail Wilson]

Strange, but it could still be the tube.

 

I have a bunch that are slower to trigger / require more power.

 

I also have the 4LW clock which I typically swap tubes in to see how they 
perform.

Some delay, some flicker.   When I power directly and add more current and/or 
voltage, they seem fine.

 

Michail 

 

From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On 
Behalf Of Kevin A.
Sent: Monday, April 15, 2019 7:55 PM
To: neonixie-l
Subject: Re: [neonixie-l] While we're talking 7971's, I have a 4LW clock 
question

 

Maybe the high voltage supply is tapped out; just not enough current for all 4 
tubes at once. Or the high voltage is a bit low and causing inconsistent 
ionization across tubes. It could also be a combination of both where the power 
supply voltage drops when the tubes are brought up, and the last tube to light 
has to ignite when the voltage is lowest. 

 

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Re: [neonixie-l] While we're talking 7971's, I have a 4LW clock question

[Kevin A.]

Maybe the high voltage supply is tapped out; just not enough current for
all 4 tubes at once. Or the high voltage is a bit low and causing
inconsistent ionization across tubes. It could also be a combination of
both where the power supply voltage drops when the tubes are brought up,
and the last tube to light has to ignite when the voltage is lowest.

On Mon, Apr 15, 2019, 9:37 PM Terry S  wrote:

> I have an early Pete Hand 4LW clock using B7971s. Since day 1, tube # 2
> has been slightly slow to energize when the IR sensor wakes the clock up.
> No big deal, I just noticed it, always tube # 2. Maybe a second late at the
> most. Always figured it was the tube.
>
> Now as of this week, it's tube #3 ! --   Tube #2 lights when it
> should. WTF??
>
> Pete -- I think you read the group -- any ideas? Just a weird curiosity,
> nothing else.
>
> Terry
>
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