Look around for something else that may be a source of oil. For instance, a leaky oil filled paper cap, especially since the oil is only on one side. I have seen a lot of disc ceramics coated with wax

I've also had problems with ready made clip leads. The cheaper ones have crimped leads which will pull out easily. The clips are cheap enough to buy in quantity. You can get flexible meter lead wire f

I remember a dark trace CRT but don't remember how it worked. There were a couple of methods of decreasing the surface reflection of the CRT screen and increasing contrast. Kodak had a patent on a non

The main sources of lighting filters are Rosco and Lee. Both are readily available. A google search will find color charts showing what is available. Standard color filters for use on stage and motion

The document I cited refers to another, a paper by W.T. Dyall. It can be found at: *https://dspace.mit.edu/bitstream/handle/1721.1/4992/RLE-TR-056-04706923.pdf*

The filters can be for a couple of purposes. First the "gray" filters are probably polarizing filters. These can be circularly polarized where light going through the filter from the outside and refle

I disagree with this as policy. My mail client will accept messages from either Yahoo or GIO, the filter will route them into the same folder. I do not post using Yahoo but want to see what messages m

Re parasitic reactance in resistors. I used my late lamented Boonton RX meter (looking for another, it got knocked off a bench and is unrepairable). I found that in the range of the instrument carbon

Which e-mail program do you use? Probably has a setting in it for header font and color.

There are two kinds of mica caps, silvered mica and plain mica. Silver mica of a certain period suffer from something called silver mica desease, probably due to moisture penetration through the Bakel

FWIW, I have a General Radio 1800A which I still use quite a bit. It is a 10Meg instrument. I have a high voltage probe meant to be used with an 11 meg meter. Because of the terminal layout of the 180

Ronsonol lighter fluid is Naphtha and fairly safe. WD-40 is mostly Stodard solvent with oil in it which works well and Kerosene will also remove some residue without harming paint.

Did you get the fan or fans going? If not that could be the problem. If so my guess is tired capacitors in the PS.

I vaguely remember using a 5AR4 as the rectifier for a tube amp I built maybe sixty years ago. It seems to me, without looking it up, it has a separate cathode and probably lower voltage drop than the

The General Radio part of the IEC site has many old GR catalogs. They will help identify the connectors used and those available as parts. GR used a couple of variations of binding posts, mostly combi

One reason for positive pressure cooling is that it reduces dust. Air is draw in through the filter which removes the dust (one hopes) and blows it through out the chassis. However, positive pressure

Look at the Oilite web site. They state that the oil is infused via vacuum. This is what I always understood about how Oilite bearings were made. There are sintered bearings that are meant for an exte

I was drawing a blank on the name Oilite, thanks.

I am not so sure about what additives there are in engine oil. One can get good quality SAE 20 machine oil at many hardware stores. 3-in-one puts it up in a blue can (red can is something else). Also

FWIW a description of the 874 appeared in the General Radio Experimenter https://www.ietlabs.com/pdf/GR_Experimenters/1948/GenRad_Experimenter_Oct_1948.pdf The patent appears at: https://patentimages.