"Irv Finkleman" wrote in message
news:IeOgk.122078$gc5.62903@pd7urf2no...
BillJ wrote:
I have Sylvania Electric tube tester. Has worked for many years, but
today known good tube test flat zero. Filaments do light. I have no
model number, it is a green panel, with roll chart.

Anybody know what might go wrong. I looked inside and see one tube, a
1EL7 I think it was. Other wise looks good, with no bad smells.

Thanks, Bill

Don't assume that a known good tube is still good. Test your tester
on more than one tube. If you are really lucky that will be the
problem.

Irv VE6BP

I wonder if anyone has tried to measure what voltages are there at the test
socket. Also the flip switches are most prone to loosing connection from
tarnish if there are no shorts from a wrong setup.

Test transformer. Usually some form of autotransformer. Tube inside is
likely a rectifier. Probably an emission only tester if it has only one
tube. (or multi section?)