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Texas Star 667V only produces 300 watts Bird

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Texas Star 667V only produces 300 watts Bird

Post by stratotanker » Saturday, 05 August 2017, 11:36 AM

I have a Texas Star 667V that only does 300 bird watts into a dummy load with a 14.4vdc supply (from my truck). What could cause this?

I'm using a 2 watt dead key/14 watt swing radio. My meter is a bird 43 with a 1000H slug.

By comparison I have a DX500 that does 400 bird on the same radio, same dummy load, same meter, etc.

Thanks in advance.

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Re: Texas Star 667V only produces 300 watts Bird

Post by Crusher » Sunday, 06 August 2017, 0:42 AM

It's hard to say. The inputs on those 667's are choked back pretty good. You are using a bird 43, does it have a peak kit? I see about 275- 325 average out of the one I have. Pep about 700-750.

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Re: Texas Star 667V only produces 300 watts Bird

Post by stratotanker » Sunday, 06 August 2017, 2:51 AM

Yes my Bird 43 has a peak board.

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Re: Texas Star 667V only produces 300 watts Bird

Post by Crusher » Sunday, 06 August 2017, 5:19 AM

Have you pulled top off and looked inside to see if anything burnt?

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Re: Texas Star 667V only produces 300 watts Bird

Post by 295 antenna » Sunday, 06 August 2017, 7:12 AM

question is this a new box or a box you had and it changed ? Because the new boxes are set up for 10 meters only
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Re: Texas Star 667V only produces 300 watts Bird

Post by jon6667 » Sunday, 06 August 2017, 10:26 AM

you only have to remove a jumper for the cb band

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Re: Texas Star 667V only produces 300 watts Bird

Post by stratotanker » Sunday, 06 August 2017, 10:34 AM

Ok the box is used. Yes I pulled the cover. The pulls look fine. I checked the collector and got 14 vdc and the base reads 0.

It was already converted for 11 meter as the cw board was removed.

Someone at some point did change the driver out from the 2290 to an MRF454. They also wired a 4.7k ohm resistor between the side of the front variable resistor VR1 and ran that to the ground, with a capacitor in line.

Then they connected one leg of the input xformer to this resistor/cap and then soldered the other leg of the x former to the ground side of the board.

The original 10 ohm resistor between the SSB delay button and VR1 was replaced with another 4.7 ohm resistor.

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Re: Texas Star 667V only produces 300 watts Bird

Post by Crusher » Sunday, 06 August 2017, 12:59 PM

Sounds like someone's tinkered with amp. No telling at this point

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Re: Texas Star 667V only produces 300 watts Bird

Post by stratotanker » Sunday, 06 August 2017, 14:57 PM

Yes someone has been inside. I am trying to make it right again.

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Re: Texas Star 667V only produces 300 watts Bird

Post by Crusher » Sunday, 06 August 2017, 18:22 PM

Need to look at schematic and put back to stock

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Re: Texas Star 667V only produces 300 watts Bird

Post by stratotanker » Sunday, 06 August 2017, 20:00 PM

I checked the 667V biasing by checking for resistance between the base of the pill and ground. I read it should be 1.3 ohms. Mine read 0.1-0.2 ohms. The Texas Star guy on YouTube said "this indicates a short". He also said to "not to put RF in." Well that was already done before I got the amp. So I guess I'm going to have to order some 10 ohm 1/2 amp resistors and cross my fingers.

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Re: Texas Star 667V only produces 300 watts Bird

Post by Crusher » Sunday, 06 August 2017, 23:08 PM

10ohm, 1/2w resistors. if your not getting voltage drop on same, time to lift base of transistor. Use a diode checker and see if transistors are good or bad. If the pill/ transistor is bad. Replacing the 10 ohm resistors won't do any good. Chances are if you have a blown transistor, the resistor across output combiner is toast.

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Re: Texas Star 667V only produces 300 watts Bird

Post by Crusher » Sunday, 06 August 2017, 23:08 PM

Inside pic would help

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Re: Texas Star 667V only produces 300 watts Bird

Post by stratotanker » Monday, 07 August 2017, 7:13 AM

Whoops I meant watt not amp. Thanks for the correction. I'll try and get a pic and figure out how to reduce the size so it doesn't keep telling me the file is too big.

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Re: Texas Star 667V only produces 300 watts Bird

Post by MDYoungblood » Monday, 07 August 2017, 13:43 PM

From what I gathered reading what you said has been done it seems like someone fried the 2290 and tried choking a 454 so it wouldn't produce the wattage they make, I think there is a 40 watt difference between the two. I would like to see a couple pics as well, get in close as possible to that section of the amp, might see something that will let us know who did the work on it. The next thing I would do is like Crusher said, restore it back to original, you can find the schematic online, replace the 454 with a 2290, check the tank to see if they rewound it, and all the right other components.

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Re: Texas Star 667V only produces 300 watts Bird

Post by Crusher » Monday, 07 August 2017, 13:49 PM

Agreed, the 454 is not a drop in replacement for a 2290. But to only get 300peak, either it's really padded on input or something is off. I have seen several of the capacitors across transformers toast. I recently redid a Gold box, the 1000pf caps across output transformers were reading 30-40pf. Lol. Someone beat the thing to death.

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Re: Texas Star 667V only produces 300 watts Bird

Post by MDYoungblood » Monday, 07 August 2017, 14:08 PM

That is what I was thinking, someone tried to "McGyver" the 454 in there because that was all they had. With the variable pot and the added resistance the 454 probably wasn't getting enough voltage to even work. I would say the amp was behind a dual final radio peak to the max, smoked the 2290 and plain and simple the 454 would have smoked the 2879's if it was installed without choking the voltage down.
The TS 667V is a good amp, worth repairing, I like the 500V better and it runs cleaner if not overdriven.

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Re: Texas Star 667V only produces 300 watts Bird

Post by stratotanker » Tuesday, 08 August 2017, 9:41 AM

Well I'd add pics but Everytime I try it keeps telling me they're too large or they just won't load.

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Re: Texas Star 667V only produces 300 watts Bird

Post by MDYoungblood » Tuesday, 08 August 2017, 17:30 PM

I sent you a PM.

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Re: Texas Star 667V only produces 300 watts Bird

Post by MDYoungblood » Wednesday, 09 August 2017, 7:02 AM

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Re: Texas Star 667V only produces 300 watts Bird

Post by MDYoungblood » Wednesday, 09 August 2017, 7:07 AM

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Re: Texas Star 667V only produces 300 watts Bird

Post by MDYoungblood » Wednesday, 09 August 2017, 7:09 AM

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Re: Texas Star 667V only produces 300 watts Bird

Post by MDYoungblood » Wednesday, 09 August 2017, 7:11 AM

Okay stratotanker, got them to post, boy that was a workout, need to take a nap, lol.

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Re: Texas Star 667V only produces 300 watts Bird

Post by Crusher » Wednesday, 09 August 2017, 13:00 PM

First picture, bottom left side. Yellow combiner. That resistor underneath looks discolored compared to the other input combiner resistor. Looks like it has at least been warm.

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Re: Texas Star 667V only produces 300 watts Bird

Post by stratotanker » Friday, 11 August 2017, 16:53 PM

What about the windings on the stack poles? This has an effect on wattage output right?

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Re: Texas Star 667V only produces 300 watts Bird

Post by Crusher » Saturday, 12 August 2017, 0:54 AM

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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Re: Texas Star 667V only produces 300 watts Bird

Post by stratotanker » Saturday, 12 August 2017, 5:52 AM

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.

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Re: Texas Star 667V only produces 300 watts Bird

Post by stratotanker » Saturday, 12 August 2017, 5:57 AM

Crusher wrote:
Saturday, 12 August 2017, 0:54 AM
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?

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Re: Texas Star 667V only produces 300 watts Bird

Post by Crusher » Saturday, 12 August 2017, 6:33 AM

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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Re: Texas Star 667V only produces 300 watts Bird

Post by stratotanker » Saturday, 12 August 2017, 7:40 AM

No I don't have another pill for it

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Re: Texas Star 667V only produces 300 watts Bird

Post by Crusher » Saturday, 12 August 2017, 11:54 AM

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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Re: Texas Star 667V only produces 300 watts Bird

Post by Crusher » Saturday, 12 August 2017, 11:55 AM

Actually I meant Tune driver.

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Re: Texas Star 667V only produces 300 watts Bird

Post by stratotanker » Saturday, 12 August 2017, 12:50 PM

Crusher wrote:
Saturday, 12 August 2017, 11:54 AM
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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Re: Texas Star 667V only produces 300 watts Bird

Post by Crusher » Saturday, 12 August 2017, 17:43 PM

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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