View Single Post
  #9   Report Post  
Posted to rec.audio.tubes,sci.electronics.repair
Big Bad Bob Big Bad Bob is offline
external usenet poster
 
Posts: 366
Default How do you test a Selenium Rectifier?

On 12/05/18 21:42, wrote:
On Sun, 2 Dec 2018 10:57:07 -0000 (UTC), Cursitor Doom
wrote:

On Sun, 02 Dec 2018 01:26:41 -0600, Fox's Mercantile wrote:

A DMM won't read correctly. No enough voltage compliance on the current
source to read ohms correctly.


True, but it *might* give some rough indication, like if the thing has
somehow shorted out. I have a few of those lying around somewhere; I'll
measure 'em with a DVM just out of curiosity and see if I get readings
like those reported by tabbs.


Just replace it with a 1N4007 diode and about 100 ohms series resistor.


Not kosher if you want to keep the internals original! Many collectors
are extremely fussy about that.


I plan to leave it on the chassis for looks, but replace it.
My voltage is real low, so it seems it's weak or worse....


right they'll probably short out when they fail and blow the filter caps.

You could try a resistive load (10k-20k, several watt resistor) and
disconnect it from the filter capacitors when you do it. Then look at
the waveform. (I suggested this in a different post already, just
summarizing)


--
(aka 'Bombastic Bob' in case you wondered)

'Feeling with my fingers, and thinking with my brain' - me