TS 667V keying issue

[Robert Foster]

Have a 667v working on having keying circuit issues any one texas star man that can help please

 

[ExitThirteen]

Does the amp key up as soon as you turn it on, or does it not key up at all?



~Cheers~

 

[Shadetree Mechanic]

How much drive are you giving it? What radio?

 

[9C1Driver]

Once you get past the two questions above if the keying transistor is out here is what they look like. Your amp should have two, one for the pre-amp and one that keys the amp up.

http://stores.goldeneagleradios.com/transistor/

 

[999]

The prime reason for this video is to show how to check the bias on a ts amp, but in the process of doing so it shows how to manually key the amplifier. That should tell you if the keying transistor is bad.

 

[nomadradio]

We adopted the habit of adding a 4.7uf or 10uf capacitor from the new keying transistor's emitter to ground. This serves to protect the replacement transistor from overheating and failing like the first one did.

73