14.31818MHz Crystal required - Can anyone help?

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14.31818MHz Crystal required - Can anyone help?

Hey everyone,

I am trying to convert a couple of Apple IIe NTSC international motherboards to true NTSC.

I live in Australia and as such cannot get colour without replacing the crystal.

I understand that the system was very picky with the crystal and it needed to be just right.

Can anyone sell me a know working crystal or 2?  If so please message me.

 

Thank you!!

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I'd be surprised if you can't

I'd be surprised if you can't find one at whatever online electronics supply house you prefer in your country.  I think these crystals were very common in a great deal of A/V equipment back in the day, so I'd think they'd still be very available.

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14.3181 crystal

Hi mamejay,

 

check out this e-bay link for 10 (3w shipping from China):

https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=crystal+14.318&_sacat=0

These are different form factor (HC49/US) but might work.

If not, I might (not sure) have the correct crystal...would take me some time to go through storage though, as it is all packed away. (I'm in NSW).

Laurie

 

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Thanks for that everyone.  I

Thanks for that everyone.  I have tried a few generic ones and they do not work.  Reading on mulitple sites it seems there was a very specific type that was required.

I have already waited a few weeks ordering to be disappointed when I install the crystal.  That is why I was after a known working one.

I will keep looking.

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I just checked what XTALS  I

I just checked what XTALS  I have: only 14.250 MHz,  However....There is one for sale in Melbourne now....

eBay item number: 323845890666  14.318, and Hc-49,  just like the Apple part.

Laurie VK2FLLB

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Easy to find ... and cheap

Easy to find ... and cheap enough ...

https://www.ebay.com/itm/371532961720

 

 

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not all 14.31818 crystals

not all 14.31818 crystals will result in proper color burst timing.

There is an old post in my blog with a couple of part numbers that do work.

http://www.willegal.net/blog/?p=5251

 

regards,

Mike Willegal

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This is fascinating.  Given

This is fascinating.  Given identical frequencies, why is it that some crystals work and others do not?

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Lee Adamson wrote:This is

Lee Adamson wrote:

This is fascinating.  Given identical frequencies, why is it that some crystals work and others do not?

 

Unknown. Try it and see. Likely some are just not as exact as labeled or are mislabeled...


They NYMPH worked to fix my board years ago. I never would have thought this could be the problem.

 

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Re: 4.31818MHz Crystal required - Can anyone help?

Have you tried Reactive Micro yet?

 

https://www.reactivemicro.com/product/crystal-14-31818mhz/

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PROMetheus wrote:Have you

PROMetheus wrote:

Have you tried Reactive Micro yet?

 

https://www.reactivemicro.com/product/crystal-14-31818mhz/

 

bought some from them and now I have colour on my CRT TV.  Cost me a lot more than ones from China but at least they work.

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