Re: {Collins} 866A semiconductor replacement

["Paul Kraemer" <elespe@xxxxxxxxx>]

Hi Tom
The subs are a great way to go IMHO except I miss the purple glow!
Depending on your VOM you can get a variety of readings, mostly meaningless 
if the device is good
e.g. one ones I have tested and known to be good in service checked on my 
Fluke dvm and Weston analog vom both indicate a resistance one direction of 
about 40megohm
The dvm indicates same in other direction, the analog indicates an open 
circuit
Neither will measure a forward conduction because the ohmmeter voltage is 
not sufficient to cause conduction and aided by fact that the good subs 
contain an internal ballast resistor
I think if you start series connecting a quantity of diodes you would find 
the same thing happening
Just for knowledge, I strung a few 1 amp diodes in series to try
The analog meter quit after two diodes, the dvm after five
Take two different model meters and probably will get different results
Oh, and I should add the dvm was being used in the diode measure function 
after the original resistance check yieded nothing of interest.
Happy Field Day
Paul K0UYA
----- Original Message ----- 
From: "TH Consulting" <thankins@xxxxxxxxx>
To: <collins@xxxxxxxxxxxxx>
Sent: Saturday, June 27, 2009 1:59 PM
Subject: {Collins} 866A semiconductor replacement


> Hi to the list--anyone out there have any experience with plugin direct
> replacement 1N2637 diodes for the MV 866A. I have 6 of them and show no
> continuity using a VOM(forward or reverse). Am I overlooking something?
>
> Tom Hankins
> K0EOA
>
>
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