Meck XB-702 restoration

[bandersen]

Here it is after a bit of tweaking. I outlined the mask in green sharpy and can almost fill the space.
Linearity is pretty good, but there is some hum making its way into the horizontal deflection.



It has a really simple IF design so the poor bandwidth wasn't a surprise.


There has also been a loud hum since the start of this project. Some of that may be due to this super simple audio coupling design. Just a cap from the volume control to the grid and a 10M resistor to ground. Just bring my hand near that circuit increases the hum.

Wrapping the cap in grounded foil helps a little.
I'm going to recheck the tube to make sure there is no heater cathode leakage.