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Texas Star amp problem.

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prcguy

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The reverse polarity diode is probably shorted. It could also be one or all PA transistors shorted but I don't believe their normal failure mode is shorted, instead they usually blow one or a couple of of individual transistors on the die and have degraded performance.

Reversing the power leads will sometimes lead to the problem you have. When did Texas Star amps start using FETs? I think they still use bipolar 2SC2290, 2SC2289, etc.
prcguy

Don't know what is up.....With amp disconnected totally from all pl259's
Amplifier turned off.When i apply 12 volts from power supply amp draws 20 amps...
Mosfets check ok.Any ideas????
Thanks....
 
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JayMojave

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Mojave Ca
Hello Nitroturbo4U:

Again Yeah what PRC Guy said....

At 13 volts drawing 20 amps is 260 watts, something has to be getting hot, whats getting hot or smoking? Looking at CBTricks.com I didn't see any amps that used the FET Transistors, but PRC Guy said SC 2990 or 2789. What model amp and type pills you got there? If the pills are conducting they should be getting warm to hot.

Jay in the Mojave
 

prcguy

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If that were the case the amp would only draw an amp or so from relay coil current and PA transistor bias, etc. More than likely the amp is class C with no bias circuit and the current in transmit mode with no RF would be less.
prcguy

The relay could also be stuck "keyed"...I had an amp relay fail that way before.

Sent from my SAMSUNG-SM-G730A using Tapatalk
 
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