Most incandescent bulbs use a little argon to help stop evaporating the tungsten filament

Has anybody tried this with multi-halide arc lamps??

xana
i use one of those little propane torches to tin the copper first ie no devices anywhere near the torch
ie https://nz.rs-online.com/web/p/blow-torches/0467450?cm_mmc=NZ-PLA-DS3A-_-google-_-PLA_NZ_EN_Power_Tools_%26_Soldering_%26_Welding_Whoop-_-(NZ:Whoop!)+Blow+Torches-_-467450&matchtype=&pla-308487046968&gclid=EAIaIQobChMIjPCHg5zo9wIVQ8ORCh1sawzjEAQYASABEgI5VvD_BwE&gclsrc=aw.ds
do not buy from these people as it is very expensive.
you will also need some killed spirits of salts to use as a flux
you can make this yourself out Zinc metal and Hydrochloric acid (Muriatic acid) you make sure to have an excess of zinc ie zinc still left and no bubbling this is killed spirits of salts.
wipe the copper with this, heat with blow torch and put ordinary solder all over.
you now have tined copper that is easier to solder to

When i'm repairing Glassman HV PSU's I test all the multiplier stack capacitors individually at their rated DC voltage looking for leakage I have a Danbridge JP30A to do this with
https://www.danbridge.com/product_detail.php?indexs=46
without this I have never found a problem at low voltage measurements ie they measure within tolerance but at elevated voltage the leakage is way out of spec

Twospoons
Before you attempt this there is a crown in China who will regas this tube for you
we have one of these at work and we bought a new tube from syrad approx $8000US$
The chinese want about a 1000 dolllars to recondition it

Use Shell Diala S5
do not mix other oils in unless replacing it all

Steve
Internet modem supplies are the bane of all amateur radio operators
Cheap
Nasty
and noisy
and thats when they are new
they go downhill from there.
Most hams try to find a 50/60Hz transformer version to replace them trouble is of course your neighbors with the SWPS version

If you have two identical cores make two and put them back to back
then run some power at various frequencies through them, losses are exacerbated by a factor of two so it should be easy to see

Parallel 10-1000 meg-ohms per kv depending on circuit topology
as for series this depends on power of the supply but I tend for a minimum of 1000% of the max current ie a supply of 100kV 100mA you would use a 100k ohms supply impedance = 12 meg ohm.
More if you want to protect your supply or less if you are adventurous

I tried to "Modify" my post but the board refused to act!!!

I meant to say that tuned circuit "Q" is made better by increasing capacitance with reducing inductance ie "Q" is proportional to "C" in a tuned circuit

All they need to do is buy cheap lesser spec'ed overrun parts from a legit maker and remove the markings and put new laser marked part number on from an expensive part.
Measuring Gate capacitance is easy for Fets not so reassuring for IGBTs of course.
Once upon a time I worked for a very large electronics company and one line of products we made were 2 way radios (RT's) for trucking firms Taxis and law enforcement for worldwide sale.
We had several of our designs copied in an Asian country and sold at much cheaper prices worldwide. We then started making fake parts ourselves this involved a cmos 4013 all the markings taken off legs then bent around the other way and circuitry put around it to make it look like a well known Switch mode controller IC. WEe marked these ourselves with a commercial inkjet printer that used uv cure. You guessed it our design was copied and they were having terrible trouble making it go. It would not work with the unitrode part, they asked us for spares and we sold them a few hundred parts for many many terns of dollars each. Our vendor mark on our fake parts looked like the Signetics logo who never made items like tis