Texas Star 667V only produces 300 watts Bird

[Crusher]

Stackpoles? Do you mean transformers? Hopefully no one changed windings. I was referring to the round yellow piece. That is a combiner. Underneath it it has a 100ohm resistor. Looks discolored maybe. If it is. That is a sure sign of an imbalance of the 2 pill sections somewhere. Hard to tell though from picture.

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[stratotanker]

Yes the transformers. (Texas Star calls them "stackpoles"). And yes I think someone did change the windings on T2 of the driver (collector side of the MRF454 - I counted 2 turns) and T3 Texas Star says it's supposed to have 3 turns - I counted 2 turns. T5 also TS shows 3 turns but I counted 2.

[stratotanker]

I was referring to the round yellow piece. That is a combiner. Underneath it it has a 100ohm resistor. Looks discolored maybe. If it is. That is a sure sign of an imbalance of the 2 pill sections somewhere. Hard to tell though from picture.

The resistor does have some brown on the ends that flakes off when scratched. I'm thinking it's just flux. The center doesn't appear bad. Should I unsolder it and ohm check it?

[Crusher]

No if it's just flux and no signs of heat in center. It should be fine. Have you put the driver back to stock yet?

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[stratotanker]

No I don't have another pill for it

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[Crusher]

To much work to try explain how to check driver or even bypass driver to just run 4 pill section and see what ya get.

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[Crusher]

Actually I meant Tune driver.

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[stratotanker]

To much work to try explain how to check driver or even bypass driver to just run 4 pill section and see what ya get.

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I was actually wondering how you would bypass the driver. I had a few tell me I'd be better off running it as a 4 pill. But I don't seem to find anywhere on the internet where it shows how to do this.

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[Crusher]

Have to disconnect input and output of driver. Then where the input used to go to driver, use rg316 coax and run a piece from the variable to input of 4 transistor. In a nutshell.

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[Crusher]

I'll have to look at 667 I have here, but I think on the 667 the changed the turns on input side of 4pill/ transistor section due to higher drive levels.

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[Monk]

I have a Motorola RF devices book and it says the MRF454 is a direct replacement for a 2sc2290.
I've never put the spec sheet next to each other and compared them but.........................

Monkradio