[Collins] Collins 51S-1 Crystals

[Gary Franklin]

I have recently replaced about 9 crystals in my 51-S1 which were so far off 
frequency I couldn't calibrate the hair line. I have a puzzling instance in 
this project. Crystal Y20 is listed in my manual as 10.333 Mhz.   The 
crystal designated Y20 on the crystal waffer of my receiver is stamped 
15.500 Mhz ????   Is this just a crystal which was stamped incorrectly or 
are there different versions of 51S-1's which use 10.333 and 15.500 Mhz 
crystals for Y20??

By the way I purchased the crystals from West Crystal and the are right on 
frequency! I would highly recommend them if you are looking for 51S-1 
crystals. They have a web site, just search for West Crystal.

Gary  K8BKB