[time-nuts] HP5065A Step Recovery Diode, what part#?
Morris Odell
vilgotch at bigpond.net.au
Wed Aug 29 22:26:20 UTC 2018
That was exactly my experience. I restored a HP5110A synthesizer driver a
few years ago in which the SRD heater thermostat had failed, reducing the
assembly to a charred lump. I set up a test jig and ran a lot of diodes
through it, the best of which was a stud mount varactor from a junked
analogue FM cellphone transmitter. It runs at room temperature and hasn't
missed a beat since then.
Quite a lot of old equipment has heaters with thermostats half a century old
that might not be trustworthy. I try to add modern thermal fuses where
possible when restoring them.
Morris VK3DOC
------------------------
From: Brooke Clarke <brooke at pacific.net>
To: time-nuts at lists.febo.com
Subject: Re: [time-nuts] HP5065A Step Recovery Diode, what part#?
For HF drive
frequencies that translated to a very long lifetime and probably very hard
to find.? Although some Huge Varactor diodes
with large thread size mounting studs may work well.
https://www.prc68.com/I/Diodes.html
Like the HP 5100.? Note the 5100 has an assembly that's an SRD inside a
heater.? The heat increases the lifetime thus
making for higher output when driven at HF.
https://www.prc68.com/I/HP5100.shtml
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