Collins 51S1 refinements

[iw5ci]

I just got a nice looking 51s1 receiver.

i would like to solve a couple of little problems to enjoy it at it's best (as the reception is really fantastic).

1) the logging scale is disaligned of a couple of khz in the same direction on all the bands, so i have to keep the line of the indicator a little turned on the left. I have not understand how to reset the logging scale respect the vfo so i can have a perfectly centered dial.

2) the calibrator signal is strong on low bands, but as i arrive to about 20 mhz it became very faint. Maybe the oscillator tube is weak or maybe there is another problem? the receiver has good sensibility in upper bands.

thanks for Help
Andrea iw5ci
Florence Italy