[fields 100]

If the numbers on TV 7 tester are being 48/53, is the tube still operational? Thanks.

[morzh]

What does the chart say they should be?
As long as the tube shows both halves conducting, even below Good, the tube will work, even if a bit weak.
Both halves should be close in value though or you will sustain increased hum.

[Steve Davis]

Put it in your radio. If it works, it's good.

Steve

[fields 100]

I see.But have to buy it prior to that.

[codefox1]

Agree. try it. Readily available and inexpensive, shouldn't be much of a gamble.

[morzh]

As long as there is no short between A and K and tube shows some conductivity the radio s the best test. If it works, it works.

[Arran]

Is this a used #80 you are thinking of buying? I have no idea what those numbers were that you quoted? Percentages? I would not buy an #80 tube that was marginal, good used ones are too easy to come by, but if it were in a radio it would still be usable.
Regards
Arran

[morzh]

http://www.ebay.com/itm/HERE-ARE-4-TYPE-...3f3743ca0e

I think this is the auction.
I think they are OK tubes.

Why, you think a guy with 100% rating will knowingly push bad nonworking tubes?

[Jayce]

I've always heard that rectifier tubes are either good or they are bad. Basically, they either work or they don't. I don't know why, but the tester I used to have and others always show one side of an 80 as being weaker than the other. 48/53 isn't a big split and that tube should last a good while longer. If one radio doesn't like it, another one of your radios might. I've had that happen as well.

[morzh]

Jayce

I believe 80 has a structure that makes measurement asymmetrical, hence the different scale factors when looking at English scale.

[Radioroslyn]

Well when it is all said and done with the tube in the set working just measure the B+. If it is within 20 percent of the listed voltage your good to go.
Terry

[fields 100]

Just got back home and read all posts.Thing is, I just need 2 globe 80's so the radios look proper in appearance, otherwise
I have a number of non globe working 80 tubes.Thanks for the info.I might even get them as a gift along with some other stuff (Father's Day).