[Phlogiston]

Russ

They are indeed used, after all why would I buy a new tube for a really screwed up chassis that is also somewhat miswired?
It seems to me used 43s are prone to pos 3 (HK) short.

The radio is DELCO 4052 ACDC.

Now you tell me looking at the sch if you have it, if the filament of the 43 is essentially the Line (hot) after the dropout resistor and the Cathode is Common Negative (GND isolated from Chassis) which is 50 Ohms from Neutral, if the short is low ohms will it work?

As I recall from the cal., the flickering lamp short is going to be several thousands of ohms but I can't seem to find that test value now. It is a little arbitrary to say flickering is better than solid on (bright) but it is somewhat true but open to interpretation. If you want to be really safe don't use the tube. It is more likely to get worse than better. Low ohms short=bad.


BTW, the noise test on many tube testers is just a sub function of the shorts test. You can listen to the noise that the short could cause.