Re: [neonixie-l] Heathkit Panaplex Clocks

[Dekatron42]

Did you replace all of the small green tantalum capacitors too? I've had a 
few that acted as shorts more or less and some that went up in smoke.

Did you place all of the electrolytics with the right polarity? Swapping 
plus and minus sometimes will result in excessive current draw if they cook 
and dry up shorting internally.

Checking the current draw on all voltages will probably give you a good 
idea on if you are drawing too much from the transformer and on which 
winding.

/Martin

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Re: [neonixie-l] Heathkit Panaplex Clocks

[gregebert]

Is anything besides the transformer getting warm ? This is where a laser 
thermometer is very handy.

How dirty/dusty were the PC boards ? In my garage it's possible for metal 
fragments to get everywhere.
Try brushing/vacuuming/blowing w/ compressed air. I know it sounds gross, 
but sniff around for cat pee.
I've had several things sprayed.

Any chance you are running at 240V ? If the transformer is set for 120VAC 
that will cause overheating.

I've never had a traditional power transformer fail on me unless something 
happened to it (water damage, overloaded)
I suppose it's possible for the laminations to develop a short/leak. Only 
way to find out is to remove the transformer and bench-test it 
out-of-circuit.

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Re: [neonixie-l] Heathkit Panaplex Clocks

[martin martin]

The clock I posted keeps perfect time.  Just the transformer runs way to
hot.  I haven’t changed all the rectifier diodes yet though

On Mon, Nov 18, 2019 at 09:23 alb.001 alb.001  wrote:

> one runs correctly, the 24 hour version runs fast
>
> thanks for the insights
>
> Phil B.
>
> -- Original Message --
> From: "'jf...@my-deja.com' via neonixie-l" 
> Date: November 18, 2019 at 9:57 AM
>
> Do they both run fast? Designs that simply count the mains are susceptible
> to noise pulses adding to the total, and most early designs were prone to
> this defect. If this is the case, I would try filtering out the noise
> spikes: ferrites on the primary side, and a low-pass on the rectified line
> frequency reference. (One exception was the CT-700x which could be made to
> run little slow or fast, depending on the setting of the MUX rate.)
>
> On Sunday, November 17, 2019 at 3:53:02 PM UTC-8, philthepill wrote:
>
> I bought two different models of Heath Kit clocks with flat planar neon
> displays. They were both plugged into two outlets on the same AC extension
> cord and then the extension cord was plugged into a wall receptacle. One
> runs as 24 hour clock, other one is a 12 hour clock After a few days they
> are not at the same time and the longer they run the further apart they
> get. I thought that they both used AC line frequency for timekeeping. Any
> ideas, I'm stumped by this.
>
> Thanks Phil B.
>
>
>
>
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[neonixie-l] Heathkit Panaplex Clocks

[alb.001 alb.001]

 
  one runs correctly, the 24 hour version runs fast
  thanks for the insights
  Phil B.
  
   -- Original Message --
   From: "'jf...@my-deja.com' via neonixie-l" 
   Date: November 18, 2019 at 9:57 AM
   
   
   
Do they both run fast? Designs that simply count the mains are susceptible to noise pulses adding to the total, and most early designs were prone to this defect. If this is the case, I would try filtering out the noise spikes: ferrites on the primary side, and a low-pass on the rectified line frequency reference. (One exception was the CT-700x which could be made to run little slow or fast, depending on the setting of the MUX rate.) 

On Sunday, November 17, 2019 at 3:53:02 PM UTC-8, philthepill wrote:

 
  I bought two different models of Heath Kit clocks with flat planar neon displays. They were both plugged into two outlets on the same AC extension cord and then the extension cord was plugged into a wall receptacle. One runs as 24 hour clock, other one is a 12 hour clock After a few days they are not at the same time and the longer they run the further apart they get. I thought that they both used AC line frequency for timekeeping. Any ideas, I'm stumped by this.
  Thanks Phil B.
 

   
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