Re: Apple ][ transistors and crystals.

[Mike Willegal <mike@willegal.net>]

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 Willegal
www.willegal.net