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Restoration of a Precision E-200C Signal Generator




 
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Author Topic: Restoration of a Precision E-200C Signal Generator  (Read 9249 times)
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n4joy
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« on: February 01, 2014, 11:39:38 PM »

Okay... this is not a high end transmitter or receiver but rather a simple RF generator.

I purchased this signal generator for a paltry amount on eBay sometime ago--it was in need of repair and some TLC.  I always thought the Precision E-200C was pleasing to the eye.  I've never spent time and money restoring test equipment but I thought I'd have some fun with this quick restoration project.  

Cabinet was blasted and powder coated (graphite black) since the original was chipped and rusty.  The chassis was carefully cleaned with alcohol and polished.  I replaced some wiring with new cloth covered and replaced all caps and a few resistors, and added a new power cord.  I even replaced the rotting leather handle.  It was also missing the chokes at the 120VAC input section.  I'm waiting on three electrolytics capacitors and it will be ready for alignment.  I'm practicing the lost art of cable lacing as well--thought I'd give it a go on this unit.

    


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W7TFO
WTF-OVER in 7 land Dennis
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« Reply #1 on: February 02, 2014, 03:35:52 AM »

Excellent job! Cheesy

I have the same model, as well as one of their sweep generators as well.  Both are very useful in repairing vintage tube gear.

73DG
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Just pacing the Farady cage...
n4joy
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« Reply #2 on: February 02, 2014, 10:05:24 AM »

Thank you!  Precision made some excellent equipment--I'll have to look for their sweep generator. The only problem now is I want to keep this unit for "display only" and not for use on the bench! Grin

I wasn't happy with the cable lacing and re-laced a section last night so the knots were even.  I've got the proper knot technique down and am amazed how quickly one can lace a section--even faster than zip ties. 

Here is a photo of the 120VAC input/choke section, cable lacing, and underside of chassis.  incidentally, I ordered 1mm and 2mm fiberglass sleeves to insulate component leads from a Chinese company on eBay.  I received more than I will ever use in my life for less than five dollars. 


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DMOD
AC0OB - A Place where Thermionic Emitters Rule!
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« Reply #3 on: February 02, 2014, 05:09:21 PM »

Nice work.

Phil - AC0OB
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"What kind of Koolaid do they make you drink in the Physics Department?" Charlie Epps to Dr. Larry Fleinhardt, NUMB3RS   Smiley
N0WEK
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« Reply #4 on: February 03, 2014, 12:42:56 AM »

I've got one of these, this inspires me to get mine up and running!

Nice work!!!
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KL7HNY
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« Reply #5 on: March 22, 2014, 05:37:26 PM »

Like the posters above, I recently acquired one from eekPay, but the power lead is pretty well shot.  Based upon the restoration pics above, I'm going to go through mine (it was just a display in my shop) and bring it up to being safe to use.  Between the modern-ish service monitor that I've got on my bench and the recently-restored Heath RF-1, I'll be able to inject carrier, high i.f., and low i.f. signals into a receiver to see where a radio has gone belly-up.  I'll have to see how stable the two quasi-ancient pieces are before I use them for anything critical, and figure on still checking everything with the "real" service monitor.
Thanks to the previous posters for the pics and tips.  
Now on to refurbing the Hammarlund, Hallicrafters, and EFJ rigs  Smiley
tnx es 73
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