Model 420 - 340
Signal Generator &
Vacuum Tube Voltmeter
A very neat matched pair of Signal Generator & VTVM
A little dirty, but they'll clean up just fine.
Opps, this one is missing a knob, I'll bet there's one
in my BA knob box.

The knob has since been found and installed. Thank goodness for all these parts I've saved over the years.
Model 420 signal generator.
It'd be interesting to know where these were used, look at how the
color is bleached out of the plastic binding posts.
Below is a second model 420 I was given by my good friend Geoff Bourne.
It has a neat vernier knob installed on the main tuning dial.