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Question on replacing the selenium rectifier in my tube checker
conroyp
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Posts: 34
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City: Columbia, MD
#1

06-19-2014, 10:50 AM
Hey gang, I have a heathkit TC-2 tube checker. I have replaced the caps and some off spec resistors. It has a selenium rectifier which id like to replace, its on the secondary of the Xfmr. My question is must I use a resistor in series with a new diode? I have hooked it up with test leads (1N5401) and it works OK without any resistance added, I am able to zero the meter and have some left on the trim pot. If I add a 100ohm i need to turn the pot full on to get the meter up to zero position.
I replaced one of these on my VTVM and had to use a resistor to drop the voltage but it was on the primary.....not sure what to do here....
The schematic shows a silicon diode symbol. Any ideas?

[Image: http://i818.photobucket.com/albums/zz105...bc3634.gif]
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morzh
Odobenus rosmarus
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City: Jackson, NJ
#2

06-19-2014, 02:36 PM
My guess is, no you do not absolutely have to.
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conroyp
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Posts: 34
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City: Columbia, MD
#3

07-22-2014, 12:25 PM
well, I put it in and all my readings are higher than used to be. I may just well nedd to add a small bit of resistance but im gonna leave it alone for now.
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codefox1
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City: Merrick, Long Island, NY
#4

07-22-2014, 02:36 PM
I think you are OK, incoming line voltage is a bit higher now. Could add a fuse or little fusister if you want.
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  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Test Equipment