[Hammarlund] [Boatanchors] Collins 3.1 KC filter question

[Kenneth G. Gordon]

On 13 Sep 2012 at 10:36, Richard Knoppow wrote:

>       The difference may have been in the plug.  The SP-600 
> uses 6BA6 tubes in the IF which are 7-pin miniatures while 
> the SP-400 and 200 and the HRO use octal-based tubes. There 
> are probably other differences to account for mechanical 
> clearances.

I don't know of any of these units which were made for the SP-600: all those I have seen or 
read of were made for receivers with octal-based tubes.

I do not KNOW that NONE were made for the SP-600: it is just that I have neither seen any, 
nor heard of any.

Ken W7EKB