diode replacement

[n7kbj]

Hi all - I'm still trying to solve the problem of my carrier that won't null
in my hw-101.  I've now replaced the 200 ohm null pot, and that improved, but
didn't fix the problem.  So I guess the next step is to replace the 4 diodes
in the null circuit.  So, here's my question:
the manual simply lists these diodes as 'crystal diodes', heath part no.
56-26-1.  In todays parlence, what am I looking for to replace them with, and
how much of a voltage/current rating do I need??
And while I'm looking for advice, does anyone know of a source for the slip-on
type tube shields that were used in the hw-101?  the tube sockets don't have
the lugs for the 'twist and lock'  type of shields.
Thanks in advance!
Jim - N7KBJ

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