{Collins} Collins 30L-1 Amplifier Serial # Question

Hello Fellow Collins enthusiasts,

I am searching for a late model 30L-1 to go with my KWM-380.  I understand 
that the 30L-1 was built from 1961-1975 but I do not understand the correlation 
between the serial numbers.  

Does anyone know what serial numbers I should look for to find a 30L-1 that 
was made between 1974 and 1975?

I sure appreciate all the help, it's a pleasure to be a part of such a fine 
group of gentlemen.


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