[R-390] [GreenKeys] 4PR65A

[Roy Morgan]

On Nov 9, 2011, at 9:01 PM, Ray wrote:

> I HAVE HAD THIS TUBE FOR A LONG TIME.   Oops.   What is it use in?    
> I have
> not seen it on any parts lists or price lists of the usual sellers  
> so don't
> know what it is it's use.

Ray,

  The PR means "Pulse Rated".  it's a version of the 4-65, a  
moderately small transmitting tube, in fact the smallest of the RCA  
glas tubes in its family. The normal tube is meant for RF or audio  
modulator service.  The 4PR65 is meant for pulse service such as in  
large radar video displays or radar transmitters.

Roy


Roy Morgan
k1lky at earthlink.net
K1LKY Since 1958 - Keep 'em Glowing!