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Re: FINALLY SOMETHING!

The behavior of your 45 is not a really GOOD sign, no. Sometimes I have had a tube that will spark once and then settle down (it's bits of material getting caught beween two elements and getting a short-circuit through them) but not as a regular behavior. Is just one tube doing this? Maybe try and get your supplier to swap a good tube for the problem child.

Measure these voltages, using the DC scale of your meter:

from pin 1 to ground - should be somewhere around 55V DC
from pin 2 to ground - should be somewhere around 325V DC
from pin 3 to ground - should be somewhere around 0 VDC
from pin 4 to ground - should be somewhere around 55V DC

So from pin 1 OR 4 to pin 2 should be about 270V DC

On the AC scale:
from pin 1 to pin 4 - should be 2.5V AC

Let us know what you find. It certainly could be a bad tube. Also your source might be having trouble providing enough signal - it's not driving a headphone and it may not sound good driving a line level input. But this is a seperate problem to the tube's misbehavior. Try taking the output from a cassette deck or whatever you might have handy and see what you get.

-j


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