[Boatanchors] National Crystal Calibrator for the HRO 50T1

[Rob Atkinson]

This may not be of much help, but in the August issue of ER, there's
an article on how to build and install a homebrew solid state xtal
calibrator that can be applied to any vintage set, plus a source for
the 100 kc crystals.  It can be breadboarded, and runs off 12 v. dc
and the article also tells how to make a small v. doubler power supply
that runs off the 6 v. filament supply.  It's a pretty useful article.

73
Rob
K5UJ
On Mon, Aug 20, 2018 at 12:16 AM Greg Gifford <cleophusa1 at att.net> wrote:
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> Hey Guys, anybody out there have a crystal calibrator for an HRO 50T1 receiver? Thanks, Greg KG4MMY
>