[Collins] Diodes in a 651S-1

[Heinz und Hannelore Breuer]

Hi Ian,

I just checked my older 1971 manual and the diodes CR105 to CR138 are
clearly marked there as 1N458. 
The older 1971 manual is only one volume including the parts list and
about 4cm thick, which is about 1 1/2". 

Try to find a manual for the 651S-1. It is almost impossible to service
without. The newer manual are 2 volumes (vol. 2 is the parts list) and
together are about 8cm thick, more than 3".

I got one older manual with my 651S-1 (LED type) and was happy to find a
newer original manual at a swapmeet over here, although it certainly was
not cheap. 

Hope this helps

73
Heinz DH2FA, KM5VT