[R-390] D-Hole Punch?

[Bob Camp]

Hi

The original radios came out with just one fuse.

After a while in the field they found a problem with the fusing. In 
order to make the radio work properly with all the heaters turned on 
and high line voltage they had to put in a fairly large line fuse. In a 
radio with the heaters all turned off and low line voltage this fuse 
was way over size. In the case of a B+ short deep in the radio you 
would take out various chunks of the power supply before you blew the 
fuse.

The solution was to add a fuse in the B+ lead out of the power supply. 
That way it would trip properly regardless of weather the heaters were 
on or off. When they added the B+ fuse they also added a holder for a 
spare fuse.

	Take Care!

		Bob Camp
		KB8TQ

On Apr 22, 2005, at 7:55 PM, Harold Hairston wrote:

> This subject reminded me of a question that I have not seen the answer 
> to; Why do some R-390A's have three fuse holders on the back and some 
> have only one???
>
> Harold
>
>
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