[Collins] Want to purchase Collins 55G-1 Preselector

[Ed Simeone]

Greetings All,
 
I recently purchased a Collins 51S-1 and would like to improve its low
frequency performance. NI6Q told me about a unit called the  Collins
55G-1 Preselector.
I would like to purchase one of these if anyone has a lead on one.
 
Cheers,
 
Ed Simeone
K6EGS