The front “slug rack” mechanism broke during shipping. You can see it had corrosion at the rivet …
The PTO mechanism, which mechanically tunes the KWS-1 has this interesting set of three metal bands. Two raise and lower a tuning “slug rack”, and they have spring tensioners, and the third is connected to the USB / LSB switch.
I decided to take the bottom cover off – just to see if anything was wrong underneath, and the parts just fell out of the top part of the cabinet.
I then used a wooden stick to move the front part of the slug rack up and down, and voila!
Howard, W3HM told me that he has experienced the same thing and fashioned a new one out of sheet brass that he bought at a hobby store and cut with scissors. After you drill the hole – you solder around it so it won’t rip. I looked at the mechanism again – and it actually is 2 little strips – they are bolted onto a small tab that has two little bolts and nuts – and then the other side of each connects to the spring.
You know – this is a 65 year old rig – so I feel I need to know how to fix these sorts of things. You should see how pristine the 75A4 and KWS-1 are – inside and out – Howard did a great job – and I can be proud that my restore of the power supply worked out well.
I took out my trusty digital calipers and found that the brass “foil” is only .1 mm thick. Pretty amazing how something that thin works – but with the springs I guess it doesn’t pull too much on the brass.
I’ve learned a ton so far and even just learning how to use an oscilloscope was a big deal and loads of fun.