Radio Shack DX-390 Sick.
 

Greetings All!
My old faithful DX-390 has lost it's shortwave section. I know this is
probably an over load issue with FETs. How easy is this to replace
them? Can someone direct me to a website that will help? Thanks!
Jon.

Radio Shack DX-390 Sick.
 

On Sep 12, 11:50 pm, jon wrote:
Greetings All!
My old faithful DX-390 has lost it's shortwave section. I know this is
probably an over load issue with FETs. How easy is this to replace
them? Can someone direct me to a website that will help? Thanks!
Jon.

The usual case seems to be that FM/SW is fine but MW is deaf.

http://dxworld.com/dx390.html

Radio Shack DX-390 Sick.
 

On Sep 13, 9:43 pm, Beloved Leader
wrote:
On Sep 12, 11:50 pm, jon wrote:

Greetings All!
My old faithful DX-390 has lost it's shortwave section. I know this is
probably an over load issue with FETs. How easy is this to replace
them? Can someone direct me to a website that will help? Thanks!
Jon.

The usual case seems to be that FM/SW is fine but MW is deaf.

http://dxworld.com/dx390.html

Greetings Again!
Well, mine must not be the usual. This is the second time around for
mine and both times the same. The first time it was still under
warrentee so I let The Shack fix it. This time it may be up to me.
Have a great weekend! Jon.

Radio Shack DX-390 Sick.
 

On Sep 12, 8:50 pm, jon wrote:
Greetings All!
My old faithful DX-390 has lost it's shortwave section. I know this is
probably an over load issue with FETs. How easy is this to replace
them? Can someone direct me to a website that will help? Thanks!
Jon.

If you find that the problem was a blown FET, you can buy yourself
some cheap insurance against future zapping.

You can put a couple of antiparrallel diodes between the gate and
ground. If this causes interference because you are close to a lot of
high-power transmitters, put two of these circuits in series. Use
something like 1N914 or 1N4148 high-speed silicon switching diodes.

Depending on where you buy them them, they are 2-10 cents each. Back
in the old days, you could get a package of 20 from Radio Shack for US
$1.00 plus tax.