Question on replacing the selenium rectifier in my tube checker - Printable Version

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+--- Thread: Question on replacing the selenium rectifier in my tube checker (/showthread.php?tid=9853)

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Question on replacing the selenium rectifier in my tube checker - conroyp - 06-19-2014

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/zz105/5X8Rider/tc-2_zps6abc3634.gif]

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RE: Question on replacing the selenium rectifier in my tube checker - morzh - 06-19-2014

My guess is, no you do not absolutely have to.

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RE: Question on replacing the selenium rectifier in my tube checker - conroyp - 07-22-2014

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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RE: Question on replacing the selenium rectifier in my tube checker - codefox1 - 07-22-2014

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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