Be careful, is my main advice. Off-line SMPS power supplies are inherently dangerous because of the amount of energy they can pull from the line, and because they will store significant amount of

I have made a number of knobs using the Alumilite materials <https://www.alumilite.com/store/pg/46-Casting-Resins.aspx>. I haven't done any for Tek knobs yet but certainly have opportunities to try. 

A vacuum chamber is not that expensive to set up and very effective. Vibration is another option, but less effective. As Vince says using the right materials and technique may eliminate the need for

As I understand it, an ultrasonic cleaner works by "cavitation", i.e. making bubbles form and then collapse. You would have to turn the cleaner on initially to "degas" the poured liquid, but then turn

Use the proper materials. Look ma, no bubbles! Vince. -- Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/ http://www.metalworkingfun.com

Hi, Against bubbles, try to use a ultra sonic cleaner ( third tooth bath ). Should work ! Herbert Am 20.12.2017 14:19, schrieb Chuck Harris:

I have done it with a pourable metal filled epoxy to copy gears with good success. The big problem is bubble migration. You have to have a plan for making the inevitable bubbles go away... both

Thanks Siggi. Much appreciated. I already visited hakanh's site and downloaded schematics. Looks like SMPS... Do you happen to have good methodic of troubleshooting SMPS - this one or in general

I have and do it quite often, just not with rtv or acrylic. I use actual silicon mold material and plastic resin, all made for making plastic parts. I don't know if the SC-504 uses the same tiny

A digital curve tracer is simply a digitally controlled couple of power supplies, and a digitally read voltmeter, and a program to do the reading and controlling. Apply current to the base, current

<snip> Hello-- Has anyone explored using RTV silicone rubber to form a mold of an existing knob, followed by using the mold to cast a replacement knob using acrylic resin (or another

The knobs are plastic primarily for cost of manufacture. The plastic defines the color, through-and-through, and makes the knob feel neutral in temperature... the aluminum hub provides the strength.

Hello Velik, The motor itself is Siemens 1AD3001-0A, Tek part No 147-0035-00, and the assembly with the board and motor is 670-2245-00. I cannot find a manual for 463, so I cannot confirm that they

OK, I think this is now the final input from my side on this topic! I studied the schematic and noted something that I thought odd in comparison to the test schedule F5. I can see that the pot R130

I've just tried this on my 7904A and I also get some readout bounce, but very little. If I position two traces in ALT mode, one at the top and one at the bottom of the screen, so they're only just not

Stephan, I appreciate the suggestion. Yes, they are quite small. So, does anyone out there have one of these very small knobs for the SC-504 that they would be willing to depart with? Merry

These are just stock knobs from RS components. I don't think it would be a particularly good way to fix the SC504, since it has the very small focus knob, and many of the same style on the front

I second the 10x for sharing! Is there any reason some of these knobs could not be machined out of aluminum (or other material); other than non-originality? Would aluminum pose any ESD or shock

Stephen, I want to tell you that I'm glad that you posted the links to your pictures. I accidentally broke the Focus knob on my SC-504 Scope. Are you able to make another one and how much to do

Here you go Phil: https://photos.app.goo.gl/R64amqABAORlL9es2 <https://photos.app.goo.gl/R64amqABAORlL9es2> ST