27 April 2018

RD-160: lower part of the tuning range

Before returning the chassis into the Radiomarelli RD-160 case I had to fix the lower tuning range. If it mutes then something stops oscillating. So I probed the variable capacitor with an ohmmeter and found out that the plates shorted in the first third of the range.

A closer look revealed that the outermost plate, that is made of three petals, was bent. And the middle petal was bent inwards, shorting the capacitor.

Last I cleaned up the plates blowing a bit of air and passing a strip of plain paper through all blades.