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Author Topic: diodes  (Read 3358 times)
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ve3cpo
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« on: March 03, 2013, 09:30:21 PM »
Hi men I have a old Hallicrafters with a selenium rectifier how do I put in a modern diode?    Darryl   73   
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KB2WIG
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« Reply #1 on: March 03, 2013, 09:35:18 PM »
D,

Which Old Halli??

klc
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W2VW
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« Reply #2 on: March 03, 2013, 09:40:02 PM »
Tack modern diode in parallel with it. Lower voltage drop. Evil selenium diode disappears electrically.
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wa3dsp
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« Reply #3 on: March 03, 2013, 10:22:08 PM »
Tacking diodes across certainly works but to me it is the lazy way. I would take out the old rectifier which is usually mounted with a screw and nut and put in a terminal strip in its place and mounted the diode(s) on it. It is true that the old selenium rectifier should be passive with the silicon diode across it but you never know for sure so I would rsther not have it in there.
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Steve - K4HX
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« Reply #4 on: March 03, 2013, 10:28:48 PM »
But then it won't be STOCK!   Grin
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KA2DZT
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« Reply #5 on: March 04, 2013, 03:05:07 AM »
Quote from: Steve - K4HX on March 03, 2013, 10:28:48 PM
But then it won't be STOCK!   Grin

Rotten egg smell is also not stock.

Fred
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K3ZS
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« Reply #6 on: March 04, 2013, 08:40:50 AM »
Sometimes you need a series resistor to keep the voltage from going too high.  I blew out a filter cap after just replacing a selenium with a silicone diode in an old receiver.
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ve3cpo
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« Reply #7 on: March 04, 2013, 04:49:03 PM »
Thanks for the replys it is a old Halli 5r40 the first radio I ever had just got off Ebay  Brings back some memories from 50 yrs. ago   73  Darryl  ve3cpo
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