| Author |
Message |
    
Taz
| | Posted on Tuesday, July 30, 2002 - 4:44 pm: | 
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Do you think its worth it to trade a klv-550 for a jb modulator? |
Hoosier Cardinal
| | Posted on Tuesday, July 30, 2002 - 5:56 pm: |
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What kind? I had a JB 200A mod and it worked great! about 75 watts keyup and 300 watts swing. |
Taz
| | Posted on Tuesday, July 30, 2002 - 6:31 pm: |
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he said it would do 100 watts |
Scrapiron63
| | Posted on Tuesday, July 30, 2002 - 6:46 pm: |
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Taz, I think you would be going down hill with any of the JB's, well except the JB2000, and I don't think that's the one your talking about.
They made three small base amps that I know about. The little orginial Jewel box, JB12 ran a 6AQ5 tube, good for 40-50 watts swing.
The JB 150 runs 1-8417, maybe talk around 100 watts.
The JB 200 runs 2-8417 tubes, it talks around 200, might swing more on a loud audioooo. But price of tubes is the big difference. Those little 8417s probably cost 50 bucks each or more. |
Scrapiron63
| | Posted on Tuesday, July 30, 2002 - 8:05 pm: |
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Here's a JB 200 on yahoo auction, you can see what it looks like.
http://page.auctions.shopping.yahoo.com/auction/68486589?aucview=0x10
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Taz
| | Posted on Wednesday, July 31, 2002 - 12:11 am: |
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he says its in awesome condition and he wants 75.00 for it. |
Hoosier Cardinal
| | Posted on Wednesday, July 31, 2002 - 7:47 am: |
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Thats why i got rid of mine tubes cost to much granted it was a great amp but i didnt want to risk it by running my wild radios into it and blowing a tube or 2.. |
2600
| | Posted on Wednesday, July 31, 2002 - 3:27 pm: |
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Yeah, it's worth it to the guy getting the KLV. Reminds me of trading a 2-year old GM Saturn 2-door for a '57 Chevy. If you just want a reliable ride to work every day, keep the new one. If you ALWAYS wanted a '57 Chevy, stock up on parts and be prepared to call a cab once in a while. The 8417 tube the old JB amps use is rare and expensive. And don't believe any advice you hear about subbing a cheaper tube. Every substitute I know of (about a half-dozen) is inferior in one or more important ways. Yeah, the JB amps were the loudest thing in town 30 years ago, but technology has come a ways since then. My favorite "JB personality quirk" is what happens when a 8417 fails, often with a flash and loud "SNAP". The zener diode that controls the tube current will get overloaded and short during the "SNAP". Now the hot, new replacement tube has no control voltage. It will cherry up and fail before you can reach the power switch. After replacing a tube, I will NOT connect the power cord on one of these without checking that part for a short. Doesn't take long, can save a bundle on tubes.
Besides, it's not just the years, it's the miles. If it's "like new" after that many years, how come nobody was putting miles on it? Because it had some weird 'little' problem nobody could find? You never know. If it went into a closet and stayed there for 20 years, there might have been a good reason it got put away in the first place.
73 |
Taz
| | Posted on Thursday, August 01, 2002 - 2:17 am: |
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Its a jb75a |
Hoosier Cardinal
| | Posted on Thursday, August 01, 2002 - 7:50 am: |
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2600. Well said!
Kinda like buying a browning mark 3 or 2 they are nice to fire up and talk on once in a while but they are a classic and are old alot like a 57 Chevy. |
Scrapiron63
| | Posted on Thursday, August 01, 2002 - 9:03 am: |
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The JB75a is a little 100 watt mobile unit, it runs 1 8417 tube. You would really hate to hear that thing buzzzzzzzz when you key it. |
Hoosier Cardinal
| | Posted on Friday, August 02, 2002 - 8:07 am: |
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Taz..
IMHO you should keep the KLV. Youd be better off in the long run.. |
Taz
| | Posted on Saturday, August 03, 2002 - 10:14 am: |
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Yeah. kept the klv |
Scrapiron63
| | Posted on Saturday, August 03, 2002 - 12:07 pm: |
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Good decision Taz, if it had been a nice 200 base the trade would not be that bad. That one for auction on yahoo is up to about 140 bucks now, and will probably go higher. JB made some nice eqipment, also accessories. In the early 1970s, they sold a Chunky Cat 700 base load antenna, for trunk, roof or mirror mount, and dual mirrow mount. It was rated at 500 watts, while most baseloaded antennas back then were very low rated.
They had the co-phase harness for dual antennas, and sold a package deal, 2 antennas, 2 JB75 amps, co-phase harness and coax. On this installation, they showed using the co-phase harness right behind the radio, it split the signal to the 2 amps, then from each amp to one of the dual antennas. Supposedly this gave you a 100 watts off each antenna. I don't how well they matched, but I can remember people running them, and they were loud. |
Hoosier Cardinal
| | Posted on Sunday, August 04, 2002 - 10:15 am: |
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Yeah and the company was not that far from were I live either! Ive been in the place several times back in the early 1990s when they used to have a carry in repair shop for amps.. |
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