EH Scott Radio Enthusiasts

The Fine Things are Always Hand Made

Adjusting the Allwave XV tuning mechanism

The beveled gear on the end of my Allwave XV band switch shaft is missing a tooth but otherwise looks OK. The missing tooth causes the mechanism to slip and catch when switching from broadcast to shortwave. Is there some way that I can re-orient that gear on the band switch shaft so that the segment with the missing tooth isn't in the range used when switching from BC to SW3?

It looks to me like the range used for band switching is about 270 degrees so I'm thinking that rotating the gear on the shaft so that the missing tooth segment is in the unused 90 degrees might solve the problem.

Does anyone know if this is possible and what the procedure would be to disassemble the mechanism enough to remove the band switch shaft?

Thanks,

-Tony

Views: 30

Comment by Kent King on October 14, 2016 at 9:05am

I've taken a few of these apart, it is tricky but it can be done. The bandswitch shaft also drives a wafer switch that is mounted at the front of the chassis...there is a hexagonal drive on the shaft for this purpose. Finally, there is an integrated shaft that drives a switch in the center can atop the chassis. All of these things are interconnected by the bandswitch shaft and must be kept in sync. I suspect you could do what you are thinking (rotate the shaft to a different orientation to avoid the broken tooth, but it will be tricky and depend on where the hexagonal switch drive will seat. Where are you located? Perhaps if you are close to one of us that works on Scott sets, we could help you make the changes. Alternatively, I am pretty sure I've got a spare shaft for you to just replace it. Of course, taking it out entails all the same problems noted above.

Kent

Comment by Tony Peterson on October 14, 2016 at 9:39am

Thanks Kent.

I'm located near Minneapolis.

Is the gear fixed to the end of the shaft so that the shaft has to be pulled out of the wafer switch from the inside of the chassis?

Comment by Tony Peterson on October 15, 2016 at 8:20am

After thinking about this a little more I've come to the conclusion that if the gear is fixed so that it can't be re-positioned on the shaft then the gear/shaft assembly needs to be replaced as rotating the shaft to re-postion the gear would cause the band switch pointer to be off.

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