5 pin tube tester

Yep that's my tube, except mine is a Raytheon. Looks to be band new but no way to test it. I also found some on ebay over in the UK. Sure whish I could find someone that needed one.

I was also hoping that someone that had a tube tester could look in their manual and tell me if they can test such a thing. Then I would know what tube tester could be purchased. I also have some big 4 pin tubes with no name on them I'm wondering if there is a web site that expalins how to id tubes.

Viridian,
Unless they have radically changed the design, the Tube Research GT 400 still uses OD3 tubes.

I still have some spare OD3's around here from when I owned that amp.

Viridian,

The tube in questions was a " OD3W " Although I did notice a few OD3 in the pile as well. But these tubes are not the same. For what it's worth the OD3 is also employed in the new BottleHead pre III.

There a few amps that use a 0D3, and even though an 0D3 and a 0D3W look very different they are substitutes. The W just has that protective shock absorber shield around it. It can be tested with the same settings as the non W.

It is very difficult (impossible?) to identify a tube that has no markings. There were 10's of thousands of different tubes made so going just on looks is pretty much impossible.

Are there any marks at all?

The 0D3W is fairly common and doesn't demand a very high price so purchasing a tester just for it would probably lose you some money unles you have a lot of them.