Reverse polarity diode ar 6666

[TES]

OOPS! Reverse polarity diode AT 6666 Hard to replace?

 

[Shadetree Mechanic]

The diode itself is Probably easy. There is a chance something else was taken out if the diode was was blown from reverse polarity though.

 

[Eldorado828]

Man, that's a good radio too!

Like @Shadetree Mechanic said, it could just be the diode but it could not just be the diode. Only one way to find out, show us the specimen and we'll point that guy out.

 

[nomadradio]

We adopted the habit of soldering a 6-Amp rectifier diode across the posts inside the radio's power socket. The diode built into most radios is a "one-time" protector. It trips the fuse when polarity is reversed, but gets overloaded and shorts internally.

Back in the day, a slip-seat driver would have to play "Edison Roulette" with his gator clips to the posts on the doghouse of a tractor. The polarity marks had been rubbed off 200,000 miles ago, and if he guessed wrong the radio would be disabled, even if he had the right size fuse in line. A 6 Amp diode would happily pop a 2 Amp or 3 Amp fuse with no damage to the radio.

Makes me wonder if the protection diode in that model is a SMT part? Haven't looked inside one of those yet.

73

 

[on-radio-shop]

Take a look here
TVS Diode

 

[on-radio-shop]

Take a look here

TVS-Diode „P6SMB“

TVS-Diode „P6SMB“; für diverse Geräte u.A. K.PO DX-5000+; CRT SS-6900 V; CRT- SS-7900; CRT SS.7900V; CRT-SS-8900; President George II, President Washington; S

www.on-radio-shop.eu

 

[Woody-202]

We adopted the habit of soldering a 6-Amp rectifier diode across the posts inside the radio's power socket. The diode built into most radios is a "one-time" protector. It trips the fuse when polarity is reversed, but gets overloaded and shorts internally.

Back in the day, a slip-seat driver would have to play "Edison Roulette" with his gator clips to the posts on the doghouse of a tractor. The polarity marks had been rubbed off 200,000 miles ago, and if he guessed wrong the radio would be disabled, even if he had the right size fuse in line. A 6 Amp diode would happily pop a 2 Amp or 3 Amp fuse with no damage to the radio.

Makes me wonder if the protection diode in that model is a SMT part? Haven't looked inside one of those yet.

73

It sounds too sensible for Manufacturers to do it.

 

[nomadradio]

It sounds too sensible for Manufacturers to do it.

Galaxy started doing this in their mobile models by the late 90s. Some newer radios have a 3-Amp rectifier for this.

73