Have a careful look. If there are patches of blue glowing on the glass, probably with fairly sharp edges, it's due to electrons missing the anode and hitting the glass instead, making it flouresce. (Most of the tube envelope may even glow. -ed) Quite pretty, and you can play for hours, moving the patch with a magnet... (Don't electrocute yourself!) This kind of glow is common with beam tetrodes and is completely harmless. (This type of glow is by far the most common.

First, read the orange glow question above. Is the color you're seeing orange, coming from the top and bottom of the tube's "guts"? If so, you're OK. BUT... if the plate, or any part of it, especially in a power tube, is actually glowing red (even a faint red) shut the amp off at once and find out what the problem is. Otherwise, you will certainly destroy the tubes. You could also destroy other parts of your amp, resulting in a huge expense to repair it.

No, you don't have to toss them just yet. However, a blue glow indicates the presence of some gas in the tube, which is not a problem in most situations. If you have noticed an increase in the amount of blue, then you might want to get a new set of tubes sooner than later. Too much gas in the tube can lead to bias failures, blown fuses, and possibly blown output transformers.

This is not only normal, it's a requirement of tube operation. This glow normally comes from the tube's heater, or filament, which heats the cathode so that the tube conducts properly. If you don't see this, and your amp doesn't seem to be working properly, check the amp in the dark (some tubes, esp. Sovtek 12AX7LPS tubes) have a filament glow which is very difficult to see. If you still aren't sure, let the amp warm up for a few minutes. Then, place a fingertip near each tube in turn.

The short and simple answer is YES! However, achieving the same effect requires a combination of several factors: The LEDs should have as wide a viewing angle as possible. This will allow the light from one LED to "melt" into the light from surrounding LEDs and make them appear as a single, continuous light source. The LED string should be placed a reasonable distance away from the object to be lit.

Aerogel has a blue cast for the same reason that the sky is blue. The very small particles that compose the aerogel scatter blue light, the same as our atmosphere scatters blue light. Similarly, when you look through the aerogel the light appears yellowish or reddish, like that of a sunrise or sunset.

Most of the time, otitis media clears up with proper medication and home treatment. In many cases, however, further treatment may be recommended by your physician. An operation, called a myringotomy may be recommended. This involves a small surgical incision (opening) into the eardrum to promote drainage of fluid and to relieve pain. The incision heals within a few days with practically no scarring or injury to the eardrum.

A) Probably nothing! The most advanced nixies, often called "Ultra Long Life" types, use quite a bit of mercury to prolong their life to 100K hours or more - this equals *decades* of continuous operation. In some tubes, this produces the strange coloration described at normal operating current. In other tubes, the effect is only objectionable at higher than normal currents [as might be used in a multiplexed display].

All of these tubes are made right here in the U.S.A. The tubes are manufactured and shipped very close to Salt Lake City, Utah.

Get a Hatori SB-8, it really sounds great! Other options are Weston Genesis Pro pipe and the KSJ speed 30 tuned muffler Another possibility is that if your struts have worn through on the bottom like mine, then the skids might be loose enough to vibrate against the set screws. Also the screws that screw the tail boom support rods to the horizontal fin are just a little long. Use a dremel cut-off wheel to take off the last 1/16"-1/8" from the screw.

No one knows for sure. There are several theories as to why the ocean is usually blue. Some scientists believe that when sunlight hits seawater, part of the white light is absorbed and part is reflected. White light is composed of various shades (all the colors in the rainbow). Seawater does not absorb blue light, so the blue light is reflected outwards. Some scientists believe that suspended matter in the sea is responsible for its blue color.

We are only as good as our worst tube. We are very selective about which tubes we use in Manley products and we have several different testing and burn-in jigs to test for certain parameters which will be most important for that tube in a given circuit. We will test and select a tube set for you that will be optimized for your Manley piece of gear and in most cases, your tube set will actually be tested in another one of what you have.

Not especially. Although I might have made a killing in the stock market had I invested the money I instead put into finding and stocking these large quantities of tubes ten years ago when the USA military were dumping their stocks of NOS JAN vacuum tubes.

Yes, it takes a while to get used to, but you will be able to hit with even more top-spin and back-spin with the moveable mass racket.

The tubes are made of a tough nylon and are protected from wear by the frame. Leaking and migration of the fluid from the tubes is minimal and the fluid will last for many years.

A polished surface is really a surface so that is so smooth, it is shiny. Naturally, the surface is a microscopic mountain range, with the light reflecting into itself. Buffing smoothes that surface to the point the light reflects back, the ‘glow’ is derived from thousands of fine directional buff lines reflecting light back that is just slightly scattered, this gives fine polished metals that ‘illumination’.

The stimuli to which skin conductivity is sensitive are manifold, including events of a novel, significant, or intense nature. Arousal level tends to below when a person is sleeping, and high in activated states such as rage or mental workload. When you engage in a mental workload task, such as solving a bunch of math problems (even if not particularly hard), the level willtend to shoot up and then gradually decline.

Straight after switching your phosphenic lamp off, a whitish glow can appear in your field of vision. At that moment, this glow is only perceptible by one person out of ten. It only lasts a few seconds. It is immediatly followed by the first phase of the phosphene. This diffuse glow will reappear once the phosphene has completely vanished. It can start reappearing after 5 minutes but, generally, it will reappear after 15 minutes of observing your field of vision.