Selenium Rectifier / Emerson 659B Radio
 

Sorry about the choppy photo its what I'm working with.

Selenium Rectifier / Emerson 659B Radio
 

"_J D_" wrote in message
...
Sorry about the choppy photo its what I'm working with.


The photo is well-lit, in focus, and has good detail. No need to apologize
for anything.

Selenium Rectifier / Emerson 659B Radio
 

_J D_ wrote:
Sorry about the choppy photo its what I'm working with.



------------------------------------------------------------------------

The pic is fine..
I'd suggest replacing that selenium stack with a suitable silicon diode
though. ;-)

Selenium Rectifier / Emerson 659B Radio
 

"_J D_" wrote in message
Sorry about the choppy photo its what I'm
working with.

"Buck*Frobisher" wrote:

The photo is well-lit, in focus, and has good detail.
No need to apologize for anything.

"PhattyMo" wrote:

The pic is fine..
I'd suggest replacing that selenium stack with a suitable silicon
diode though. ;-)

I plan on replacing the selenium rectifier with an 1N4007 diode, cause
the old stack is only outputting @ 55 VDC. Had posted a thread on the
Group: rec.antiques.radio+phono.
As for the pic comments thanks..

Selenium rectifiers increased their internal resistance with age and use. This was accompanied by commensurate voltage drop rendering less output voltage for use as B+. The suggestion of using a silicon diode replacement is a good one. I would recommend that you add a 22 ohm 1 watt resistor in series with the silicon diode AND place a .001 mfd 1KV capacitor in parallel with the new silicon diode. This addition will serve to reduce surges through the diode junction and to bypass transients around the diode. I have followed this practice for many years and found it to be beneficial. Good luck. Dr. T.