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  1. #1
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    Default 4 x gi6b amplifier

    Has anyone had any experience with building or seeing a 4 toob GI6B amp?
    I would be interested in hearing any info on this.
    Aardvark

  2. #2
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    Browning Mark 3, Uniden Grant XL,Galaxy 95T, Are my main Radios in the hous
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    I would go with 1 or 2 gs35bs.

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  4. #3
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    gs35b 2x$170 = $340
    gi6b 4 x$20 = $80

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    I think 55 uses that tube.


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  7. #5
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    I would like to try a pair of GMI-11s. Tough as heck and doesn't require forced air. A pair would give you 1 KW PEP...

    I hate loud fans. Quiet is the way to go.

    http://qro-parts.com/product_info.ph...products_id=82
    Last edited by Schitt Kicker; 08-26-2012 at 07:13 PM. Reason: link added

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  9. #6
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    Quote Originally Posted by Schitt Kicker View Post
    I hate loud fans. Quiet is the way to go.
    audio control, pass the word!


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  11. #7
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    Quote Originally Posted by Road_Kill View Post
    audio control, pass the word!
    You mean AF Gain?

    The air conditioner is loud enough. No need to make it worse...

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  13. #8
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    I didn't say AF gain did I? I have blowers and a window unit going up here in the attic, but my carrier is dead quiet ................. or at least EagleEye said it was!


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    Quote Originally Posted by Road_Kill View Post
    I didn't say AF gain did I? I have blowers and a window unit going up here in the attic, but my carrier is dead quiet ................. or at least EagleEye said it was!
    You're missing the point. It ain't the fan noise (or lack of) on the transmitted audio. I don't want to hear it in the room.

  15. #10
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    Quote Originally Posted by Schitt Kicker View Post
    I don't want to hear it in the room.
    Oh hell, I get it now! You have to kick me from time/time.


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    I don't really have much choice, I need a window unit because my room is detached from the HVAC. And a "hum" is much easier to predict than a dog barking, phone ringing, or people talking.

    But I'd still contact 55 for that tube.


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  18. #12
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    55 will definitely be the first one I call, RK. I dig that tube.

    If it can hold up in a Russian fighter jet- It should be just fine.

  19. #13
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    That GMI-11 looks like a good tube to use for building .
    Aardvark

  20. #14
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    Crusher is offline Pro Mauldropper DX Numbers: 2190 Home Channel: the trax
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    a GI-6B is good for about 500W pep. If pushed 750w pep per tube. Tube has a plate dissipation of 350W Easy to lightand low plate volts. Getting ready to build a 1 tuber. Need a baby driver here.

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  22. #15
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    Quote Originally Posted by Crusher View Post
    a GI-6B is good for about 500W pep. If pushed 750w pep per tube. Tube has a plate dissipation of 350W Easy to lightand low plate volts. Getting ready to build a 1 tuber. Need a baby driver here.
    thanks for the info Mr Crusher. Thats the kinda thing im looking for. Good stuff! Do you happen to know what the plate resistance is for the gi6b?
    Aardvark

  23. #16
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    Have to know what plate voltage you are going to run at. Not at idle, but when under load as the 2 may differ significantly. Also if you are going to run the tube in spec, or if your gonna drive the crap out of it. Driving the crap out of it means higher current and will reduce impedance. Gotta fill in a few unknowns before i can point you in to proper direction. Maximum Anode Voltage is 2500vdc. Supposedly max. current is .175. But that is a maximum safe rating for longevity. Now if your gonna run that crap out of it, it might be closer to .2-.25A, but this will shorten the life of tube. Don't forget, these tubes need to have a warm up time. 90 seconds minimum, but i like a full 2 minutes. Usually have to let them warm up overnight the first time. Remember, these tubes have been sitting around for 20-30 years+

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  25. #17
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    Quote Originally Posted by Crusher View Post
    Have to know what plate voltage you are going to run at. Not at idle, but when under load as the 2 may differ significantly. Also if you are going to run the tube in spec, or if your gonna drive the crap out of it. Driving the crap out of it means higher current and will reduce impedance. Gotta fill in a few unknowns before i can point you in to proper direction. Maximum Anode Voltage is 2500vdc. Supposedly max. current is .175. But that is a maximum safe rating for longevity. Now if your gonna run that crap out of it, it might be closer to .2-.25A, but this will shorten the life of tube. Don't forget, these tubes need to have a warm up time. 90 seconds minimum, but i like a full 2 minutes. Usually have to let them warm up overnight the first time. Remember, these tubes have been sitting around for 20-30 years+
    Yes sir Mr Crusher I was planning on a 12 hour burn in on the tubes. I'll running 2150vdc on the plate and would probly drive them til they pull bout .250a .
    I can calculate the impedence. Just didnt think bout using plate volts and current to derive the answer. Thanks for the education and pointer.

  26. #18
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    Plate impedance= plate voltage/ (1.7 x plate current). How could you think you could derive it without.

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  28. #19
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    Also I would recommend a Q of 10-12. I have seen higher Q's but they don't tune out as well. The best output with the least amount of drive. Gotta try and keep the cathode current low. Granted the tubes are cheap. But when they start to dry up the price will jump up. Then they will cost what a 572b does. Example the 35B. Used to be able to get them for less than $100 shipped. Now $170 or more.

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  30. #20
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    I've mulled over this Q in the past. Some bowl boxes might have a Q approaching 20, but I agree with staying in the area of 10-12.


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