|[AMRadio] Diode Blocks|
wa4tukhr at gmail.com
Sat Jun 7 12:37:09 EDT 2008
You'll need more voltage to test a diode string than a common DVM or VOM
supplies. For each junction with diodes are in series you'll need about
0.7 volts each to just begin forward conduction.
A hi-pot tester would be ideal, but you could use a DC bench supply etc.
at a much lower voltage just to see if the diode string is open. The
To-6 capacitor tester in other recent posting could be used to test
diodes strings using the cap leakage function up to (probably) 600
volts. Be sure to use a current limiting resistor but one way should
conduct (be very leaky) and the other way should block (no leakage).
Bob Bruno - K2KI wrote:
> I too would like to have this info too. I have 4 large black diode
> blocks which will not test.
> Here is the info I have on mine:
> The blocks measure 1" x 1" x 4 3/4" long and have the following markings:
> A diode symbol
> EDI 8552
> I sent an email to EDI about 3 months back plus a follow up a month
> ago and hey have gone unanswered.
> They test open but I know that at least two work because I took them
> out of a working HB power supply that powered a 4x811A amp. The other
> two were spares.
> So, any info on how to test and rate these would be most helpful...
> Bob de k2ki
> Rick Brashear wrote:
>> Is anyone have reference material to the old Sarkes Tarzian diode
>> blocks? I
>> have a couple of these in the Bauer 707 and have no idea if they are
>> I wonder how they can be tested?
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