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 Post subject: tektronix 107
PostPosted: Nov Mon 11, 2019 5:02 am 
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Joined: Dec Sun 18, 2016 12:07 am
Posts: 7
I am repairing a signal generator and I am trying to find capacitors for it. Part numbers are 290041 and 290052. One is a dual 40mfd 250 volt and the other 125 mfd 350 vole.


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 Post subject: Re: tektronix 107
PostPosted: Nov Mon 11, 2019 5:14 am 
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Joined: Jan Tue 10, 2012 8:39 am
Posts: 793
Did you check the usual suppliers? Those are not rare parts, I believe.

Bob


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 Post subject: Re: tektronix 107
PostPosted: Nov Mon 11, 2019 5:15 am 
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Joined: Sep Tue 30, 2014 6:08 am
Posts: 4871
Location: Norfolk, VA
The "updated" part numbers are 290-0041-00 and 290-0052-00.

Unfortunately, these can caps were discontinued by Tek in the 80s, so finding exact replacements would be for nil - the replacements would be at least 35 years old, and no longer reliable. It's best to replace them with individual capacitors of equal value.

The Tek Reistor/Capacitor common design guide lists capacitors of similar values on page 13-13:

http://w140.com/tekwiki/images/b/b8/Tek ... 89_ocr.pdf

You might find one that is currently available that will work.

_________________
Brian
"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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 Post subject: Re: tektronix 107
PostPosted: Nov Mon 11, 2019 8:25 am 
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Joined: Jun Sat 15, 2019 7:43 pm
Posts: 263
Digi-Key or Mouser will have the capacitors you need.

DM


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 Post subject: Re: tektronix 107
PostPosted: Nov Wed 13, 2019 12:43 pm 
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Joined: Nov Wed 15, 2006 7:56 am
Posts: 1403
Location: germany
samde1 wrote:
I am repairing a signal generator and I am trying to find capacitors for it. Part numbers are 290041 and 290052. One is a dual 40mfd 250 volt and the other 125 mfd 350 vole.


They are both not critical.
For a simply repair you can use 2pcs of 47µF and a Set of 100µF parallel a 22µF.
For a fine restoration you can make empty the old C and insert the (smaller!) new in the case from the old.

If yo need selected C for time bases ask me I do that for friends, < 0.1% is possible.

Martin


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