[Drake] TR-4 and TR-3

[n4kwg at att.net]

I think the main difference is the VFO, tube on the TR3 and Solid state on the TR4. Plus a few cosmetic changes. There was not a significant difference all the way up to through TR4C. 
--
Department of Redundancy Department

 -------------- Original message ----------------------
From: Eric <spamsink at scoot.netis.com>
> 
> What are the main differences between the Drake TR-3 and TR-4?
> 
> Rick WA1RKT
> 
> 
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