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Just curious, has anyone ever tried 3D printing replacement knobs? My Tek equipment is all intact but I could use a few HP knobs as well as a couple of Genrad. That might be a nice little sideline for

MOV's are a rather blunt instrument. They have two voltages that are important, the first is their sustained voltage, and the second is their transient voltage. The sustained voltage must be higher

If you check my original post, you will see I used NTC. my later use of PTC was a typo on my part. Capacitors behave as short circuits to transient pulses. Because the snubber capacitor is there, the

Copied in below is Ed's excellent message 76038 about the 22xx singing power supply problem from 2012. tom jobe... Ed Breya Apr 29, 2012 It depends on the perception level. If a "piercing whine" means

Here's the link in the groups.io message base: /g/TekScopes/messages?msgnum=76038 Bob.

Craig Thanks for that info. Yes, I have seen other RIFA snubber combo units (cracked) which I junked, and replaced with separate R+C - but that was without doing any brainwork. Now I want to

For what it is worth, Quad (the audio company) used to use a RIFA 100nf/100ohm X2 snubber across the switch output. In other words not across the switch. That was present in the 33 preamp and FM4

Here's some background info on this: https://groups.yahoo.com/neo/groups/TekScopes/conversations/messages/76038 If you simply change some of the parts, it may apparently solve the problem because the

Snubbers are usually applied to dissipate the energy in reactive transitions. If you use a capacitor only, it will tend to form a resonant circuit that can ring. It's good to have some resistance

Kevin Thanks! My goal is to reduce/eliminate arcing in a mechanical switch (or across relay contacts) - that's all. 1. You've stated between 1-10nF is suitable - is there a definite method to

I don't know why one would look to a snubber to protect a switch. Snubbers, RC, RLC, are typically employed to control dv/dt on semiconductors. I don't consider a capacitor alone as a snubber. It is

"the PTC is in parallel with the resistor, not in series" Just to confirm that it is definitely an NTC, not a PTC, in the 2465 "EMF is a high voltage phenomenon, not a high current phenomenon. The

Would a metal oxide varistor be more suitable?

On Mon, 30 Jul 2018 15:52:29 -0400, you wrote: The supply has to deal with (effectively) a ramp up of the input voltage rather than an abrupt step. May confuse some chips that need a minimum dv/dt,

On Mon, 30 Jul 2018 11:50:21 -0700, you wrote: >I have now seen two 2465 PCB blocks with a burnt-out on/off switch. > >The damage is caused by the arcing across the now-separating terminals, when the

Several people have mentioned their interest in schematics, others have offered to try and make image files or PDF's. Being the original poster, I'll collect scans/images and if the package is more or

John, Yes, please have a look if you have PDF schematics, that would make life a lot easier. Raymond

You could take the schematics to almost any Office Depot and copy them full size to a ThumbDrive. Then post them in the files area. 73, Dick, W1KSZ wrote:

Everyone - thank you very much for the pointers! I will attempt as described - a "spit and shine" cleaning, then checking rail voltages and ripple, then following the H?kan's article (special

How about our hero Hakan! He comes through with the best information on the planet, time after time! Also, a big 'Thank You' to everyone who contributes to all of the fine discussions that come across