Re: [IRCA] SP 600 /R390

[Milspec390@xxxxxxx]

Right. Friend babysat pile of R-391's in Thailand, remote controlled from 
Viet Nam. When something was up, several racks of 391s would clatter, grab 
everyone's attention, and true to form, stop dead on mark.
 
Customer with whom we became friendly presently lives in SE PA, still runs 
his. We supplied 391. He had telephone dialer and PS-972 (??), powers up two or 
more of these beauties.
 
 390s underrated due to lack of mechanical filters. It's not a handicap. High 
dynamic range and ability to sweep tune six IF stages allows for creativity. 
As with choosing favorite muscle car, one of each is a good start. 390s proved 
reliable. As in Pt. Judith, same here, salt air, temp/humidity flux, few 
troubles. Replace a rectifier or 6BJ6 IF tube once in while. Easier to find 60 
year old 6AK5 than three year old chip. Old story. 
 
                                                              z



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