Author Topic: Rare EMI / Light Filters for Tek 7000 Series Scopes on Ebay  (Read 905 times)

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Offline Marc M.

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Rare EMI / Light Filters for Tek 7000 Series Scopes on Ebay
« on: December 13, 2016, 06:33:01 pm »
Tek 7000 fans, I ran across these on Fleabay and picked up a couple.  They have them listed as "TEKTRONIX 378-0603-00 LIGHT FILTER NEW OLD STOCK 5 1/4 X 4 3/4" so they're easily missed.  They are actually part of the EMI option 3 (at least on the 7844's) which also includes added RF gaskets on the covers, and that's about it.  The filter is a flat black fine mesh screen which replaces the standard off white bezel. It cuts the glare down considerably at the cost of a bit of brightness as well as providing EMI shielding.  It was a pretty rare option and this is the 1st time I've run into them on Fleabay (caveat: I haven't been actively searching).  They are US Government Surplus and came in sealed metalized bags, wrapped in bubble wrap, and finally in a die-cut, fold out cardboard carrier.  Top quality all the way.  A bit pricey for the shipping ($12.85 + $2.00 each additional) but $7.99 for the filter itself is very reasonable.  I've included a couple of requisite pictures.  The 'before and after' shots were taken at a fixed f/4 1/15sec IS0-800 for comparison.

The usual disclaimer:  I don't know the seller from Adam, just excited to find these and knew some fellow EEVblog members would share my enthusiasm!
Link:  http://www.ebay.com/itm/251270874903?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Don't replace the cap, just empty the filter!
 

Offline DimitriP

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Re: Rare EMI / Light Filters for Tek 7000 Series Scopes on Ebay
« Reply #1 on: December 13, 2016, 07:27:46 pm »
 :-+
   If three 100  Ohm resistors are connected in parallel, and in series with a 200 Ohm resistor, how many resistors do you have? 
 

Offline edavid

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Re: Rare EMI / Light Filters for Tek 7000 Series Scopes on Ebay
« Reply #2 on: December 13, 2016, 08:01:00 pm »
Just wanted to mention that I find these far inferior to the regular plastic filters for normal use.  It's like looking at your scope through a window screen.
 


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