BC 221 Frequency Meter tidy up

[Rod Salter]

Mike,

I am pleased you have the power supply for yours.
I may use mine in a field display sometime, so I went for a battery version.

I agree with you that crystals drift off frequency,
In fact, I think this drift is why the Frequency Meter was invented perhaps?

scan bc2210001.jpg
Mine has no crystal in it.
The switch is set to xtal off, which bypasses the inner grid circuit to ground.
I, therefore, am unable to check the calibration, however, it seems accurate with this book.

Considering their age our units are doing well.

Somebody was very clever to find a book to match this unit.
Even the case is a mismatch.

I would like to know or see a photo of the 1000kc crystal if anyone has one? Please?