14.31818MHz Crystal required - Can anyone help?

11 posts / 0 new
Last post
Offline
Last seen: 3 years 5 months ago
Joined: Jul 3 2019 - 21:46
Posts: 8
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!!

Lee Adamson's picture
Offline
Last seen: 2 years 1 month ago
Joined: Oct 11 2018 - 22:53
Posts: 92
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.

Offline
Last seen: 1 month 4 weeks ago
Joined: Nov 20 2004 - 00:26
Posts: 53
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

 

Offline
Last seen: 3 years 5 months ago
Joined: Jul 3 2019 - 21:46
Posts: 8
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.

Offline
Last seen: 1 month 4 weeks ago
Joined: Nov 20 2004 - 00:26
Posts: 53
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

macnoyd's picture
Offline
Last seen: 1 day 50 min ago
Joined: Oct 15 2012 - 08:59
Posts: 787
Easy to find ... and cheap

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

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

 

 

Offline
Last seen: 21 hours 54 min ago
Joined: Jun 5 2008 - 07:26
Posts: 471
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

Lee Adamson's picture
Offline
Last seen: 2 years 1 month ago
Joined: Oct 11 2018 - 22:53
Posts: 92
This is fascinating.  Given

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

Offline
Last seen: 2 hours 13 min ago
Joined: Dec 19 2008 - 21:01
Posts: 371
Lee Adamson wrote:This is

[quote=Lee Adamson]

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

[/quote]

 

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.

 

Online
Last seen: 14 min 38 sec ago
Joined: Sep 21 2017 - 11:10
Posts: 30
Re: 4.31818MHz Crystal required - Can anyone help?
Offline
Last seen: 3 years 5 months ago
Joined: Jul 3 2019 - 21:46
Posts: 8
PROMetheus wrote:Have you

[quote=PROMetheus]

Have you tried Reactive Micro yet?

 

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

[/quote]

 

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.

Log in or register to post comments