Freq counter max input voltage-boatanchor safe?

[Bruce Brackin]

Have recently acquired a nice frequency counter for bench work on my
multiplying boat anchors.  Having problem finding specs and manual and
don't want to blow the front-end away with too high of voltage from tube
sets.  Anyone familiar with the max input ratings for a Beckman
Industrial UC10A universal counter or similar model?  I can make up a
voltage dividing probe but want to be on the safe side. Works well to
about 100 MHz and I want to keep it that way.  Thanks in advance.

Bruce Brackin

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