[AMRadio] Re: AMRadio Digest, Vol 53, Issue 8

Roger Basford roger at new-gate.co.uk
Sat Jun 7 06:08:33 EDT 2008

Hi Rick,

I used to come across those in some high-voltage PSUs made by EG&G, we used
them for seismic acoustic sources offshore. I think that they are strings of
diodes and, possibly, snubber resistors but the potting they used is pretty
resistant to solvents or heat, so they're virtually unrepairable, I remember
trying to fix one at sea! The forward resistance should be equivalent to the
number of individual diodes they used, so the normal few ohms you get from a
modern diode would be perhaps ten-fold on the blocks. If they are O/C both 
then at least one diode has bit the dust.

You could simply substitute a chain of something like 1N5408 diodes instead.



> Message: 1
> Date: Fri, 6 Jun 2008 11:57:17 -0500
> From: "Rick Brashear" <rickb at tx.rr.com>
> Subject: [AMRadio] Diode Blocks
> To: "'Discussion of AM Radio in the Amateur Service'"
> <amradio at mailman.qth.net>
> Message-ID: <006c01c8c7f6$60a88c00$aceef218 at main>
> Content-Type: text/plain; charset="us-ascii"
> 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 good.
> I wonder how they can be tested?
> Thanks,
> Rick/K5IAR

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