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Author Topic: Johnson Invader 200 Restoration  (Read 2087 times)
K8EZB
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Posts: 9




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« on: October 28, 2017, 01:54:08 PM »

Recently acquired an Invader 200 in decent cosmetic and electrical condition. It works on some bands, but needs some tweaking (alignment, neutralization, etc). It is in nice overall condition, so I am inclined to bring it up a few notches. I understand  this transmitter is not exactly a paragon of technical virtue, but because I have a background with the EFJ Company, I am motivated to see what I can make of it. Some items I am looking for:

1. Touch up paint for the cabinet: gray wrinkle finish. There are a few small chips here and there that need touch up. I can likely replicate the wrinkle part if I can get some paint of the correct color. Worst case, I can mix some, but if it is available from others, will save some hassle.
2. Feet for cabinet: I can find feet that will work, but original (or reproduction) preferred. Possibly same feet used on other EFJ equipment?
3. Restoration/repair services: pretty sure I can handle this, but just in case!
4. Uninstalled upgrade kit to convert I 200 to I 2000. Mission impossible most likely, but just maybe ...  Would also consider purchasing a complete I 2000 in superb condition.

Any pointers/links to these items greatly appreciated.

Rick
K8EZB
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K8BYP
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Posts: 149




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« Reply #1 on: December 14, 2017, 04:14:31 PM »

Generically , see my article coming up in CQ magazine next month on restoration.
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KE0ZU
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Posts: 331


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« Reply #2 on: December 14, 2017, 06:52:01 PM »

Interesting, are you saying Johnson had a "kit" to upgrade the invader to a 2000?   Are you talking about pulling out "the amplifier upgrade kit"?  won't there be extra holes left in the panel from the amplifier controls?

I happen to have an Invader 2000 on the test bench right now, the first one I've ever seen, and I must say its a VERY impressive transmitter.   For 1300 1962 bucks it certainly should have been.   

Good luck with your project.
« Last Edit: December 14, 2017, 07:01:55 PM by KE0ZU » Logged

Regards, Mike
https://mikeharrison.smugmug.com/
Pics and bold print are usually links.
K8EZB
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Posts: 9




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« Reply #3 on: January 07, 2018, 05:42:55 PM »

The upgrade kit was intended to convert an I200 to an I2000. The I200 power supply chassis is removed (unplugged and unbolted) from the I200 cabinet and a high power amplifier deck installed in its place, along with a new front panel overlay providing for the amp controls. If you look at a photo of an I200, you will notice that there are few controls on the right side of the front panel; this is where the amp deck controls are located in an I2000. The power supply chassis removed from the main cabinet is reinstalled on a new remote HV power supply chassis (part of the upgrade kit and usually placed on the floor nearby). Total number of Invaders sold is estimated to be a few hundred. Probably a much smaller number of upgrade kits. If you dig around online a bit you will find EFJ Catalog 965 describing the upgrade kit (also referred to as a conversion kit). At that time (1965) the I200 was listed at a price of $619.50, and the upgrade kit was also priced at $619.50. The upgrade kit was factory wired and included factory made cables, so installation was mostly a bolt together task. From today's vantage point looks to be a kluge. A factory assembled I2000 was priced at $1229.00.
« Last Edit: January 07, 2018, 06:06:54 PM by K8EZB » Logged
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