[TenTec] Corsair I gone bad!

[Mike Bryce]

Joe,

it’s far from a parts unit! Heck I’ve repaired a lot worst.

If you’re getting only half power out, I’m going to assume that you have lost one of the pa transistors. The tripping of the power supply tells me one has went south. It’s not a dead short, or you won’t be able to even power the PA up. 

There could of course be other issues, but without seeing the rig, I’ll go with the first one, and that’s a FUBAR transistor.


Ten Tec PA aren’t that hard to fix. Coax in, coax out, +13, and T/R control/ Bias voltage. Four screws and it will fall into your hand.

Best bet would be to use a VOM and check the Base/collector then collector/emitter tabs of the PA transistors. I suspect you’ll find one that has very low resistance.

Mike, WB8VGE


Mike Bryce
prosolar at sssnet.com

“The trouble with quotes on the Internet is that you never  know if they are genuine”

—Abraham Lincoln







> On Nov 2, 2016, at 2:14 PM, k7mks at comcast.net wrote:
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> During testing thru a Bird 43 into a dRAKE 
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> During testing thru a Bird 43 to a Drake KW dummy load my Corsair decided to quit with a bang like a firecracker and a puff of smoke exiting from the 3/8" hole in the top of the final assembly. The power supply breaker tripped 
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> After I recovered from this sudden turn of events I discovered that I still had a working transmitte but could only get about 30-45 watts output before the PS breaker tripped at about 14A or so. 
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> I strongly suspect my Corsair went from a nicely working radio to a "parts unit" in an instant but decided to touch base with those that are more comfortable with the events I've described. What likely went astray in the RF final? 
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> 73 Joe K7MKS 
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> KW 
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