| Author |
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Radiodude
| | Posted on Wednesday, July 10, 2002 - 11:32 pm: | 
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A friend of mine just put extra finals in his 2517!!! He added 2 and now the radio will do 100 watts!!! Well i want to know if this is a real good idea or not? |
Jyd
| | Posted on Thursday, July 11, 2002 - 7:28 am: |
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how did he do that?where would you put extras? |
Dx431
| | Posted on Thursday, July 11, 2002 - 11:23 am: |
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Inquiring minds wanna know. |
Karatebutcher
| | Posted on Thursday, July 11, 2002 - 3:16 pm: |
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I also am very interested in hearing this information, |
Bigbob
| | Posted on Thursday, July 11, 2002 - 9:17 pm: |
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Obviously his time means nothing to him,at a rate of $40 per hour I'll bet he's got at least 10 hours in it that's $400.Buy a klv550 and save $100,get more watts for less.I used to do this with my vehicles until I realised I could be fishing with my nephew and let the pro.mechanic bust his nuckles. |
Jyd
| | Posted on Thursday, July 11, 2002 - 5:48 pm: |
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well radio dude? how do you do it? |
Radiodude
| | Posted on Thursday, July 11, 2002 - 11:33 pm: |
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Ok Guys I will find out the steps and post it here as soon as I can. I did not do it myself. A friend that i work with did it and he said it took about 3hrs to do it.
Yes you could get a KLV amp but then you wouldnt have the pleasure of having done the mod .
More to follow. |
Honkytonkman593
| | Posted on Saturday, July 13, 2002 - 4:09 pm: |
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radiodude is right. everyone always says oh just get a linear and save yourself the trouble. yeah granted i have some ummmm. nice size boxes but i like the drive you can get to run them. i mean think about it...2 finals drive a large box well but 4 would drive a texas star 1600 great! and theres no fun in not playing inside your radio....well to a point! the idea is to learn some of the basics of a radio and what you can learn could save you big time in the long run. radio dude if you do find out how it was done please post it. this type of REAL INFO AND KNOWLEDGE is why a lot of us like this forum. the techs and other users need and crave real helpful info not just do this get rid of that!!! keep up the good work guys i enjoy the forum. later |
Jyd
| | Posted on Saturday, July 13, 2002 - 7:45 pm: |
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well if you are going to go that far use 2-mrf-477's 40 watts each,with 2 of them you can get 90 or 100 watts.they just have a little diffrent configuration. |
Bigbob
| | Posted on Saturday, July 13, 2002 - 5:58 pm: |
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A 2970 or a 2990!And how reliable is the mod only time will tell.3 hours,that includes realignment and retuning?Where did he get a matched quad of 2312s?Other wise it's to darn hard to tune out imbalances,what do you think 307 or tech181 or tech671? |
Tech671
| | Posted on Saturday, July 13, 2002 - 7:59 pm: |
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Sometimes it's fun to experiment. If you have lots of patience, time, and money (boom).
I think all of us as enthusiasts and hopeful techs have gotten caught in the "mopowah" rut in radios. Generally the board design won't supply ample current and/or oscillation problems come into play. You're not just slapping finals in, sinking them, and feeding them signal and current. Ample current, ample drive, correct biasing and tuning, it's just not worth it to me.
A KL203 is pretty cheap, no hassle, set the rig at 1w and presto, 100w + out with no headaches and no strain on the rig.
That's my nickel..... |
Ss8541
| | Posted on Saturday, July 13, 2002 - 9:57 pm: |
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if he didn't 'volt' all 4 finals, then the votlage reg/mod amp would blow on the 1st key up. there is -no way- that it could hold 4 2312's. and like 671 said, there is more to this than just dropping in two more finals. you have to build the missing biasing circuits, coupling caps, chokes, etc for each extra final. you definitely are talking about too much time(and money/per watt) for even -most- experimenters. |
Radiodude
| | Posted on Saturday, July 13, 2002 - 10:57 pm: |
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The finals were easy to find and the alignment was also easy. i have not been able to catch up with him ,but I will and as soon as i do I will post all the steps and also pic so you all can see. To me doing the mods and the learning the insides of the equipment is far better that just getting a "box"
More to follow |
Radiodude
| | Posted on Sunday, July 14, 2002 - 10:51 pm: |
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I have my friend doing a write up on the mod step by step. And you are wrong about it going boom. I hear him even as I type this and he sounds "great" I will post the steps when he gets them to me |
Ss8541
| | Posted on Sunday, July 14, 2002 - 11:56 pm: |
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radiodude, if you are replying to me being wrong about the radio going boom, then i have to contest that. if he is using the stock 2sb754 reg/mod amp that is rated at something like 60w(and this is heat dissipation), then how is it going to supply the current for a 100w output. it isn't, and that is the bottom line. so he must have volted the finals or built a regulation/mod circuit that could dissipate around 200w of heat(you have to take into consideration the heat that is produced with the voltage drop across this regulator, which is higher in am than ssb).
of course the finals are easy to find. they are mounted on the back of the radio. but like tech 671 and i said, there is more to this than just dropping in finals. you have to rebuild all the 'supporting' circuits also. but what would we know, we are just techs.
i'm i saying it can't be done. heck no, any tech could do it, it just isn't practical. |
Radiodude
| | Posted on Tuesday, July 16, 2002 - 8:18 pm: |
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Again WHY NOT!!. The radio works fine I have seen it and it will go 100!! I am in the process of writing up the steps and will post pics to go with it .
I was an unbelever also till i saw it with my own eyes. I am not a tech and could not even think of a thing so involved.
More to follow |
Ss8541
| | Posted on Wednesday, July 17, 2002 - 8:56 pm: |
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"AGAIN WHY NOT!!!" - radiodude quote.
did you even read the posts above?? if not reread. we all answered your 1st post. it may not have been what you wanted to hear, but we did answer. no one, including myself, has said that it would not work.
its not really all that involved. either volt the finals or parallel 2 2sb754/817's(match pair or add 'ballasting' to unmatched pair to keep current levels the same) and then copy the rest of the circuit/circuits. but then the 2sa473 will need to be upgraded to a 2sa1012, if 754's/817's are paralleled. the only problem that i see is one driver(2166) pushing 4 2312's. the reason most of us have a problem is because of the amount of time/money involved for such a small increase. you are only doubling your power(3db), when 1s-unit increase takes a 4times inrease(6db) in power.
and to be honest, i am very much looking forward to your pics and write up. |
2600
| | Posted on Thursday, July 18, 2002 - 3:28 pm: |
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Really, the proof's in the pudding. I hear about all kinds of magical "one-shot" mods that somebody worked up, spending many hours to perfect on just ONE radio or amplifer. What I listen for is how well the next half-dozen of them work out. Likewise, how many of them are still delivering this miraculous result after 6 months of reqular use. Hot-rodding cars and hot-rodding radios aren't all that different. Any machine is a chain of weak links. If you 'beef up' one link in the chain, the next one down the line becomes the NEW weakest link. A modification that works on at least 9 out of 10 radios and doesn't shorten service life TOO MUCH is a good one. Just the same, folks who 'hot-rod' cars will tell you that Nitrous Oxide gives you mucho more horsepower, but you'll never get 100,000 miles from an engine equipped with it. So far nobody admits to holding a finger to the heat sinks or the power transformer on this thing after it has been talking any amount of time. If this mod imposes a time limit on transmit, that would be a responsible detail to pass along with the 'how-to' steps.
73,
2600 |
Bigbob
| | Posted on Friday, July 19, 2002 - 6:07 pm: |
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Oh you betcha!!! |
Bigbob
| | Posted on Tuesday, July 23, 2002 - 11:04 pm: |
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WELL C'MON RADIODUDE WE'RE A WAITIN',WHAT'S TAKIN' YOU SO LONG,boy do I sound impatient or what?LOL! |
Bigbob
| | Posted on Tuesday, July 23, 2002 - 11:16 pm: |
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2600,I saw a fan at radio shack to end all fans.It was a muffin fan,silent running,13.8 volts 1.3AMPS WOW,THIS THING WAS 8 INCHES ACROSS AND 2 INCHES THICK.IT MUST BE 1/4 HORSE POWER.Cut a hole over the power supply on any radio and install it AND YOU'RE COOL,only problem is you'll need to upgrade the supply to handle the extra load.DOH!!! |
2600
| | Posted on Wednesday, July 24, 2002 - 12:58 am: |
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Hey, while you're at the Shack (You've got questions, we've got blank stares!) just pick up a power supply for the fan. They got 'em.
73 |
Bigbob
| | Posted on Wednesday, July 24, 2002 - 6:49 pm: |
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I DON'T KNOW is an answer,isn't it? I get that one 90% of the time. |
Bigbob
| | Posted on Saturday, August 03, 2002 - 2:43 pm: |
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Radiodude you serious or not? |
2600
| | Posted on Sunday, August 04, 2002 - 1:13 am: |
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c:\My Documents  TurboBridgeSmall.JPG
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Taz
| | Posted on Sunday, August 04, 2002 - 5:34 pm: |
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Well, I have to see this one. I think after you even adjust the biasing it would only do like 4 watts max! cause the board isnt designed for using 4 finals. |
2600
| | Posted on Sunday, August 04, 2002 - 5:15 pm: |
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I'm not sure why it lost the text I entered for this picture. This is one way to extend the life of the bridge rectifier in a Turbo/2990/Eagle5000. Move it into the basement, put in on a separate heat sink good for 30 watts or so. Makes it more comfortable. Just so nobody thinks I'm dead-set against weird one-of-a-kind extreme base-station mods. It doesn't put out so much as one watt more than it did before, but should do it longer at a time safely, that's all.
73 |
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