Re: Apple ][ transistors and crystals.

[MdntTrain <js@cimmeri.com>]

On Dec 4, 10:25 pm, Mike Willegal <m...@willegal.net> wrote:
> I know this was an old thread, but I figured I'd offer up some
> definative information I discovered during my Rev 0 Replica project,
> just in case someone finds this thread in the archives.
>
> Crystal - The crystal is indeed serial, but not all serial crystals are
> the same.  After quite a search, the only HC49 form-factor crystal that
> I could find, that allows the circuit to consistantly generate an
> accurate color burst is as follows:
> Vishay/Dale part number XT9UNLANA14M31818 and can be purchased at Mouser
> using Mouser number 73-XT49U1431-S
>
> 2n4258 replacement transistor - NTE159 is the correct NTE replacement
> for the 2n4258, but it's not really that hard.  Turns out that an
> ordinary 2n3906 works fine in the circuit, even though the
> characteristics aren't identical.  Just to make you feel a little better
> about this choice, a 1982 RCA SK series replacement manual that I happen
> to have, recommends the SK3466/159 as the RCA SK replacement part for
> both the 2n3906 and the 2n4258 parts.
>
> Regards,
> Mike Willegalwww.willegal.net

I concur on the 73-XT49U1431-S... that's the one I went with as well.

On the 2n4258, I went with the NTE106..

~ J