Heathkit IO-18 Oscilloscope (Knobs) - UK Vintage Radio Repair and Restoration Discussion Forum

MrElectronicman · 20th Nov 2012, 6:11 pm

I have just acquired the above scope, for sentimental reasons you understand, and I am wondering how to remove the control knobs in order to give it a bit of a clean. it's in really good shape and a quick wipe over is all it really needs.

The manual indicates that the knobs have an metal insert, which when pushed on to the shaft cannot be removed? Then, it you need to change a pot do you need to destroy the knob in order to do it? or is there another way. I am reluctant to try force as I may actually break something which would be a shame.

Refugee · 22nd Nov 2012, 1:17 am

Would they not be the type with a press stud that you flick out with a knife to reveal a nut that you undo half a turn to get the knob off.

Amraduk · 22nd Nov 2012, 2:08 am

Quote:

Originally Posted by Refugee

Would they not be the type with a press stud that you flick out with a knife to reveal a nut that you undo half a turn to get the knob off.

They would be collet knobs!

Regards,

Dave.

MrElectronicman · 23rd Nov 2012, 1:07 am

I have got one of the knob offs. One of the pots was sticking about half way, with a bit of wiggling the knob came off, unfortunately together with the shaft. The knob is just a friction fit on the shaft, and there is a metal inset in the plastic knob with a retaining spring.

The plastic carrier for the wiper has broken, which is why the shaft came out. It's a simple fix to change the pot now the knob is off

20th Nov 2012, 6:11 pm	#1
MrElectronicman Heptode Join Date: Feb 2011 Location: Washington DC, USA Posts: 619	Heathkit IO-18 Oscilloscope (Knobs) I have just acquired the above scope, for sentimental reasons you understand, and I am wondering how to remove the control knobs in order to give it a bit of a clean. it's in really good shape and a quick wipe over is all it really needs. The manual indicates that the knobs have an metal insert, which when pushed on to the shaft cannot be removed? Then, it you need to change a pot do you need to destroy the knob in order to do it? or is there another way. I am reluctant to try force as I may actually break something which would be a shame. __________________ David

22nd Nov 2012, 1:17 am	#2
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,554	Re: Heathkit IO-18 Oscilloscope (Knobs) Would they not be the type with a press stud that you flick out with a knife to reveal a nut that you undo half a turn to get the knob off.

23rd Nov 2012, 1:07 am	#4
MrElectronicman Heptode Join Date: Feb 2011 Location: Washington DC, USA Posts: 619	Re: Heathkit IO-18 Oscilloscope (Knobs) I have got one of the knob offs. One of the pots was sticking about half way, with a bit of wiggling the knob came off, unfortunately together with the shaft. The knob is just a friction fit on the shaft, and there is a metal inset in the plastic knob with a retaining spring. The plastic carrier for the wiper has broken, which is why the shaft came out. It's a simple fix to change the pot now the knob is off __________________ David