Recent content by atmasphere

The early Tung Sols had a weird linearity curve which they fixed in later versions. If you find their really old tube data manuals and look at those curves and then compared to RCA or Sylvania from the same period you'll see what I mean.

The Triplett cleaned up pretty well. It had a dirty switch and the meter sticks a bit mid scale. So I have to take it apart again, also because I need to replace its glass. I cleaned it inside and out to rid it of the moldy smell. I found a bad 0.1uf cap that got a nice upgrade to a nice...

Thanks! Oddly, the name plate is mounted upside down. If I get the cabinet repainted I might correct that.

The Triplett 3413-A I have to clean it up and do something about the smell of the paper rolls, which are again like an old cabin in the woods. I' not sure if I will repaint the cabinet. I has a bit of rust on it where the paint was worn off. The main cosmetic fix seems to be replacing the glass...

I picked up an older Triplett tube tester over the weekend. So I have a restoration project...

The 807 is a 6L6 with a plate cap instead of the plate being connected to the base. This allowed it to run much higher plate Voltages without arcing. What amp do you run that uses those?

That really isn't a good metric. Look at the pins prior to putting it into a socket to see if there's any wear on them. You can have NOS tubes that are duds. They are usually untested from the factory; not all of them were good. I would send this one back in any case...

Dang! I've done stuff like that and have an idea of how much patience it requires. Looks fabulous, from one geek to another!

I'm kind of conservative about these things. The shaft of a control is a mechanical thing an so long as the chemistry used isn't going to mess with the metals involved it should be just fine. The problems can start when that chemistry creeps onto the phenolic and other materials used to make up...

Really do your level best to avoid using that stuff in the squeeze bottle. Its the sort of thing I mentioned earlier. I've seen people contaminate circuit boards by overzealous use on tube sockets. Nothing for it- the boards had to be replaced. There is a reason they instruct to wipe off excess...

It does. Western Electric developed the 'parafeed' (parallel feed) SET technology to get around the bass problem all SETs have when using a gapped output transformer. This is an example of a parafeed amp and really is the way to do it if you want to use an SET. Normally a parafeed SET is less...

Yes, after the war the 4, 5 and 6 pin tube production was mostly for legacy equipment. It made a difference when the tube type was the only game in town.

Are you able to test them yet?

A consolidated chart for the 600 Some notes of things to which you should pay attention!

That is the way to do it- just let it sit. I've freed a lot of stuff that way (I tend to work on a lot of vintage machines...). When you clean the switch: if you use DeOxit, the one to use is in the green, black and white spray can. Use it as sparingly as possible, since it can damage the...