[R-390] Nuvistaplug?

[rbethman at comcast.net]

Hello All,

Just my $0.02 worth.

I've got one of the "infamous" Northern Radio diversity types of the SP-600.

I find it "very" nice, and it seems to hold its own with a well aligned and tubed R-390A.  I don'tknow how or why.  I only know that its own alignment is a royal pain, especially because of the changes done by Northern.

Bob - N0DGN

-------------- Original message -------------- 
From: "Cecil Acuff" <chacuff at cableone.net> 

> Hey Folks, 
> 
> Les Locklear can speak better to this...as can Andy and Al Parker 
> but there aren't really 21 different models....I think there were just a 
> group of different contracts of sorts over the years in the JX series and 
> the JX numbers were not in order of manufacture. Just because it had a 
> different JX number didn't mean it had a change to the circuit 
> configuration. I think the JX-1 through JX-14 were pretty much the same 
> then came the JX-17 which is know as the "Diversity" model and then back to 
> the pretty much standard circuit configuration from that point on up to the 
> top...which was what the JX-26 or 31 or something like that.....Then there 
> was the VLF! 
> 
> There were a few field modifications released by the military such as the 
> variable IF gain control on the front panel which is a nice mod! 
> 
> They changed from paper caps to ceramic caps at some point. 
> 
> I'm not partial to the Diversity model but they seem to bring more when sold 
> than the others.... 
> 
> If buying I would be more concerned about the condition of the radio than 
> the model designation, but they are all getting more expensive for sure! I 
> own a JX-1 and a JX-14 and I think the JX-1 is the nicer of the two and will 
> probably be my keeper along with the VLF and the SP-600 Leary. 
> 
> Those who are more knowledgeable in the models please correct me if I have 
> led anyone down the wrong path! 
> 
> Cecil.....