Suitable replacement transistor for 9022a

[CbRadiosPRONTO]

boomer 600 - adjusting bias lead to a bad transistor on the bias board. Can somebody suggest a replacement? - UA7805c

Originally I thought it was a 9022a so that's what I posted in the title.

 

[ExitThirteen]

It's a standard 5 volt regulator IC in a TO-220 package. Look up LM7805, that will be a direct replacement. Good luck.


~Cheers~

 

[AudioShockwav]

It is a very common 5 volt, fixed, positive voltage regulator, in a TO220 case, rated at 1.5 amps with the proper heat sinking.

7805=5 volt
7808=8 volt
7812=12 volt
7815=15 volt and so on
just google, UA7805, or LM7805,or L7805, lots of results.
Rat Shack used to have them by the handfuls.

73
Jeff

 

[AudioShockwav]

13 was typing faster...lol


73
Jeff

 

[CbRadiosPRONTO]

13 was typing faster...lol


73
Jeff

Perfect. Thanks. Funny you mention proper heat sinking. This thing is just free floating. Gets a little hot for that.

 

[Robb]

Perfect. Thanks. Funny you mention proper heat sinking. This thing is just free floating. Gets a little hot for that.

Of course under a load it will heat up w/o sinking and possibly fail again. Most radios sink to the chassis of course.
But you can add a free standing heat sink that will extend its life for well under a buck:

And a sil pad for $.20:
http://www.digikey.com/product-search/en?mpart=SP900S-0.009-AC-54&v=211

 

[AudioShockwav]

back when Palomar was building real amps like the magnum line they at least put some heat sinks on them, these knockoffs are just tossed together....look at the leads in the amp that have scorch marks on them.
My hands are not steady enough to do fine soldering work anymore ( no more installing chipswitches for me) but that just looks sloppy.

73
Jeff